RFO

What's Up in the Night Sky

Here's a month-by-month listing of astronomical predictions for the year, compiled by
Jack Welch, RFO astronomy instructor.

 

Abbreviations

Astr Twi/AT -Astronomical Twilight
Cal - Callisto
Civ Twi/CT - Civil Twilight
Cr - Crescent
Disap - Disappear
Dbl Tr - Double Tansit
E - End/Exit
Ec/Ecl - Eclipse
EcD - Eclipse disappearance
EcR - Eclipse reappearance
Eur - Europa
Ex - Exit
Gan - Ganymede
Gr El - Greatest Elongation
Jup - Jupiter
Lun - Lunar
Max - Maximum
Mer - Mercury
Min - Minimum
Mn - Moon
Naut Twi/NT - Nautical Twilight
Nr - Near
Occ - Occultation
OcD - Occultation disappearance
OcR - Occultation reapparance
Opp - Opposition
Pen - Penumbral
Reap - Reappear
Qtr - Quarter
Sat - Saturn /Satellite
Sh - Shadow
S/St - Start
Stat - Stationary
Tot - Total
Tr - Transit
V Nr - Very Near
Ven - Venus
Zod Lt - Zodiacal Light

 

Observing

Upcoming Observing Highlights

January 2017
  • Sunday, 1/1/2017 - Occ of ZC3196 - Time: 18:30
    • At about 1836 the mag 6.3 star ZC3196 will disappear behind the moon's dark limb 73° from the north cusp. Note that the moon will be 20° high in the SW. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Monday, 1/2/2017 - Algol min - Time: 02:00
    • Algol eclipse minimum is at 0215.
  • Monday, 1/2/2017 - CrMn vnr Ven nr Mar - Time: 18:00
    • -
  • Tuesday, 1/3/2017 - Quadrantids Peak - Time: 06:00
    • Conditions for the Quadrantid Meteor Shower are highly favorable this year with no moonlight interference after 10pm on 1/2. Rates of about 50 to 200 meteors per hour are possible at the peak with the greatest activity in morning hours before 6am, after which twilight will begin to interfere. The peak activity is short-lived so some luck is necessary to catch such an outburst. Lesser rates occur for more than a week before and after the peak.
  • Tuesday, 1/3/2017 - CrMn vnr Mar nr Ven - Time: 18:00
    • -
  • Wednesday, 1/4/2017 - GRS Tr - Time: 03:00
    • The Great Red Spot transits the center of Jupiter's disk at 0258.
  • Wednesday, 1/4/2017 - Algol min - Time: 23:00
    • Algol eclipse minimum is at 2304.
  • Thursday, 1/5/2017 - Mer in E thru 1/29 - Time: 06:30
    • A moderately good morning apparition of Mercury. Maximum altitude 45 minutes before sunrise is 8° on 1/15 (GEW 1/19).
  • Thursday, 1/5/2017 - 1st Qtr - Time: 12:00
    • -
  • Thursday, 1/5/2017 - Occ of 89 Psc - Time: 18:00
    • At about 1825 the mag 5.1 star 86 Piscium will disappear behind the moon's dark limb 66° from the south cusp. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Friday, 1/6/2017 - Io Sh/Sat Tr - Time: 02:00
    • Io's shadow transits Jupiter from 0223 to 0436 followed by Io itself from 0336 to 0548.
  • Saturday, 1/7/2017 - Algol min - Time: 20:00
    • Algol eclipse minimum is at 1953.
  • Monday, 1/9/2017 - Occ of Hyadum-I - Time: 00:30
    • At about 0054 the mag 3.7 star Hyadum-I (gamma Tauri) will disappear behind the moon's dark limb 24° from the south cusp. Hyadum-I is a very close double so a double event may be detectable with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Monday, 1/9/2017 - Eur EcD - Time: 01:00
    • Europa disappears into Jupiter's shadow 0.8 Jupiter disk width west of Jupiter at 0125. Note that Jupiter is 8° high in the east. (The GRS is in the SE of Jupiter's disk.)
  • Monday, 1/9/2017 - Mn nr Aldebaran - Time: 02:00
    • The moon is near the very bright red-orange star Aldebaran. Use binoculars.
  • Monday, 1/9/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0209.
  • Thursday, 1/12/2017 - "Wolf" Moon - Time: 03:30
    • -
  • Saturday, 1/14/2017 - Io EcD - Time: 01:00
    • Io disappears into Jupiter's shadow 0.5 Jupiter disk width west of Jupiter at 0123. Note that Jupiter is 11° high in the east. (The GRS is visible during this event.)
  • Saturday, 1/14/2017 - GRS Tr - Time: 01:00
    • The Great Red Spot transits the center of Jupiter's disk at 0114.
  • Saturday, 1/14/2017 - Mn Vnr Regulus - Time: 21:00
    • The moon is VERY near the very bright blue star Regulus in Leo. Use binoculars.
  • Monday, 1/16/2017 - GRS Tr - Time: 03:00
    • The Great Red Spot transits the center of Jupiter's disk at 0252.
  • Tuesday, 1/17/2017 - Vesta opp - Time: 17:00
    • The minor planet Vesta is at opposition at mag 6.2 in Cancer near the Gemini border and the star 9 Cnc.
  • Thursday, 1/19/2017 - Mn nr Jup - Time: 01:00
    • -
  • Thursday, 1/19/2017 - Last Qtr - Time: 14:00
    • -
  • Saturday, 1/21/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0200.
  • Sunday, 1/22/2017 - Io Sh/Sat Tr - Time: 00:30
    • Io's shadow transits Jupiter from 0038 to 0250 followed by Io itself from 0150 to 0401. Note: Jupiter's altitude is 8° at 0038.
  • Sunday, 1/22/2017 - Algol min - Time: 04:00
    • Algol eclipse minimum is at 0359.
  • Monday, 1/23/2017 - Io OcR - Time: 01:00
    • Io reappears from behind the east edge of Jupiter's disk at 0109.
  • Tuesday, 1/24/2017 - CrMn nr Sat - Time: 05:30
    • -
  • Wednesday, 1/25/2017 - Eur Sh/Sat Tr - Time: 00:30
    • Europa's shadow transits Jupiter from 0045 to 0316 followed by Europa itself from 0312 to 0534.
  • Wednesday, 1/25/2017 - Algol min - Time: 04:00
    • Algol eclipse minimum is at 0049.
  • Thursday, 1/26/2017 - GRS Tr - Time: 01:00
    • The Great Red Spot transits the center of Jupiter's disk at 0106.
  • Thursday, 1/26/2017 - 2% CrMn nr Mer - Time: 06:30
    • The crescent moon is north of Mercury. Start watching at 0630. A clear low SE horizon is necessary.
  • Friday, 1/27/2017 - New Moon - Time: 16:00
    • -
  • Friday, 1/27/2017 - Algol min - Time: 21:30
    • Algol eclipse minimum is at 2138.
  • Saturday, 1/28/2017 - GRS Tr - Time: 02:30
    • The Great Red Spot transits the center of Jupiter's disk at 0246.
  • Saturday, 1/28/2017 - 1.3% CrMn - Time: 18:00
    • An ultra-thin 1.3% crescent moon is 5° high 22° south of due west 30 minutes after sunset (or at 1758 calculated for RFO). Use binoculars.
  • Sunday, 1/29/2017 - Io Sh/Sat Tr - Time: 02:30
    • Io's shadow transits Jupiter from 0231 to 0444 followed by Io itself from 0342 to 0552.
  • Sunday, 1/29/2017 - 5% CrMn - Time: 18:30
    • A thin 5% crescent moon is in the west.
  • Monday, 1/30/2017 - CrMn nr Ven & Mar - Time: 18:30
    • -
  • Monday, 1/30/2017 - Algol min - Time: 18:30
    • Algol eclipse minimum is at 1827.
  • Monday, 1/30/2017 - GRS Tr - Time: 24:00
    • The Great Red Spot transits the center of Jupiter's disk at 0016 on 1/31.
  • Tuesday, 1/31/2017 - Cr Mn vnr Mar & nr Ven - Time: 18:30
    • Use binoculars to view this very nice close grouping!

February 2017
  • Wednesday, 2/1/2017 - Gan Sh Tr - Time: 24:00
    • In progress when Jupiter rises, Ganymede's shadow ends its transit of the north polar region at 0125, at which time the Great Red Spot is visible. Note that Jupiter's altitude (calculated for RFO) is 9° at midnight.
  • Thursday, 2/2/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0154.
  • Friday, 2/3/2017 - 1st Qtr - Time: 20:30
    • -
  • Saturday, 2/4/2017 - GRS Tr - Time: 03:30
    • The Great Red Spot transits the center of Jupiter's disk at 0332.
  • Sunday, 2/5/2017 - Mn vnr Aldebaran - Time: 19:00
    • -
  • Sunday, 2/5/2017 - Occ of ZC741 - Time: 22:30
    • At about 2246 the mag 5.5 star ZC741 will disappear behind the moon's dark limb 86° from the north cusp. ZC741 is an extremely close equal double, which may be detectable for those with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Monday, 2/6/2017 - Io EcD - Time: 01:30
    • At 0131 Io disappears into Jupiter's shadow 0.5 Jupiter disk width west of Jupiter.
  • Monday, 2/6/2017 - Jup stat - Time: 11:00
    • Jupiter begins retrograde motion near the bright star Spica in Virgo, which serves as a convenient reference for tracking Jupiter's sky motion.
  • Monday, 2/6/2017 - Io Sh/Sat Tr - Time: 23:30
    • In progress when Jupiter rises, Io's shadow transits Jupiter, ending at 0105 followed by Io itself from 2359 to 0209. Note that Jupiter's altitude (calculated for RFO) is 12° at 2359.
  • Tuesday, 2/7/2017 - GRS Tr - Time: 01:00
    • The Great Red Spot transits the center of Jupiter's disk at 0102.
  • Thursday, 2/9/2017 - Gan Sh Tr - Time: 02:30
    • Ganymede's shadow transits Jupiter's north polar region from 0248 to 0522.
  • Friday, 2/10/2017 - Eur EcD - Time: 01:00
    • Europa disappears into Jupiter's shadow 0.7 Jupiter disk diameter west of Jupiter at 0102.
  • Friday, 2/10/2017 - "Snow" Moon - Time: 16:30
    • -
  • Saturday, 2/11/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0418.
  • Saturday, 2/11/2017 - Mn Vnr Regulus - Time: 04:00
    • The moon is VERY near the very bright blue star Regulus in Leo, growing closer as dawn approaches. Use binoculars to appreciate this colorful sight.
  • Saturday, 2/11/2017 - Algol min - Time: 05:30
    • Algol eclipse minimum is at 0544.
  • Sunday, 2/12/2017 - Gan OcR - Time: 23:00
    • At 2325 Ganymede reappears from behind Jupiter's south-southeast limb.
  • Monday, 2/13/2017 - Zod Light in W thru 2/26 - Time: 19:30
    • Look for the zodiacal light in the west after twilight from a dark site without western light pollution. Best times to look are from about 1930 to 2000. Note that glare from Venus interferes this year.
  • Tuesday, 2/14/2017 - Io Sh/Sat Tr - Time: 00:30
    • Io's shadow transits Jupiter from 0046 to 0258 followed by Io itself from 0148 to 0358. Note that the Great Red Spot is visible during the earlier portion of this event.
  • Tuesday, 2/14/2017 - GRS Tr - Time: 01:30
    • The Great Red Spot transits the center of Jupiter's disk at 0147.
  • Tuesday, 2/14/2017 - Algol min - Time: 02:30
    • Algol eclipse minimum is at 0233.
  • Tuesday, 2/14/2017 - Mn nr Jup - Time: 24:00
    • -
  • Wednesday, 2/15/2017 - Io OcR - Time: 01:00
    • At 0106 Io reappears from behind Jupiter's east limb.
  • Thursday, 2/16/2017 - GRS Tr - Time: 03:30
    • The Great Red Spot transits the center of Jupiter's disk at 0325.
  • Thursday, 2/16/2017 - Algol min - Time: 23:30
    • Algol eclipse minimum is at 2323.
  • Thursday, 2/16/2017 - Ven brightest - Time: 23:00
    • Venus is at its brightest now, at mag -4.8.
  • Thursday, 2/16/2017 - GRS Tr - Time: 23:00
    • The Great Red Spot transits the center of Jupiter's disk at 2317.
  • Saturday, 2/18/2017 - Last Qtr - Time: 11:30
    • -
  • Saturday, 2/18/2017 - Eur Sh/Sat Tr - Time: 23:00
    • In progress when Jupiter rises, Europa's shadow transits Jupiter, ending at 0015 followed by Europa itself from 2345 to 0206. Note that Jupiter's altitude (calculated for RFO) is 10° at 2300.
  • Sunday, 2/19/2017 - Algol min - Time: 20:00
    • Algol eclipse minimum is at 2012.
  • Sunday, 2/19/2017 - Gan EcR/OcD - Time: 23:00
    • At 2323 Ganymede reappears from Jupiter's shadow slighly west of Jupiter's southwest limb. Then Ganymede disappears behind Jupiter at 0058.
  • Monday, 2/20/2017 - CrMn nr Sat - Time: 05:00
    • -
  • Tuesday, 2/21/2017 - Io Sh/Sat Tr - Time: 02:30
    • Io's shadow transits Jupiter from 0239 to 0451 followed by Io itself from 0336 to 0546. Note that the Great Red Spot is visible during the earlier portion of this event.
  • Tuesday, 2/21/2017 - GRS Tr - Time: 02:30
    • The Great Red Spot transits the center of Jupiter's disk at 0233.
  • Tuesday, 2/21/2017 - CrMn nr Sat - Time: 05:00
    • -
  • Tuesday, 2/21/2017 - Io EcD/OcR - Time: 23:30
    • At 2346 Io disappears into Jupiter's shadow 0.4 Jupiter diameter west of Jupiter. Then Io reappears from behind Jupiter's east limb at 0254.
  • Thursday, 2/23/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0411.
  • Saturday, 2/25/2017 - Eur Sh/Sat Tr - Time: 24:00
    • Europa's shadow transits Jupiter from 0019 to 0249 followed by Europa itself from 0208 to 0428. Note that the Great Red Spot is visible during this event transiting the southern hemisphere directly south of Europa's shadow (in the northern hemisphere).
  • Sunday, 2/26/2017 - GRS Tr - Time: 01:30
    • The Great Red Spot transits the center of Jupiter's disk at 0140.
  • Sunday, 2/26/2017 - New Moon - Time: 07:00
    • -
  • Monday, 2/27/2017 - Gan Ec & OcD - Time: 00:30
    • At 0047, Ganymede disappears into Jupiter's shadow about 0.9 Jupiter disk width west of Jupiter, then reappears from the shadow at 0320 near the southwest polar limb. Ganymede disappears behind Jupiter at 0429.
  • Monday, 2/27/2017 - 2.8% CrMn - Time: 18:30
    • A very thin 2.8% crescent moon is visible 40 minutes after sunset (1842 calculated for the RFO site) 19° high 21° south of due west.
  • Monday, 2/27/2017 - Eur OcR - Time: 23:30
    • At 2333, Europa reappears from behind Jupiter's southeast limb.
  • Tuesday, 2/28/2017 - GRS Tr - Time: 23:00
    • The Great Red Spot transits the center of Jupiter's disk at 2309.

March 2017
  • Wednesday, 3/1/2017 - Io EcD/OcR - Time: 01:30
    • Io disappears into Jupiter's shadow at 0139 0.3 Jupiter diameter width west of Jupiter, then reappears from behind Jupiter's east limb at 0440.
  • Wednesday, 3/1/2017 - CrMn nr Mar - Time: 19:30
    • -
  • Wednesday, 3/1/2017 - Io Sh/Sat Tr - Time: 23:00
    • Io's shadow transits Jupiter from 2300 to 0113 followed by Io itself from 2349 to 0159.
  • Thursday, 3/2/2017 - GRS Tr - Time: 05:00
    • The Great Red Spot transits the center of Jupiter's disk at 0456.
  • Thursday, 3/2/2017 - Io OcR - Time: 23:00
    • Io reappears from behind Jupiter's east limb at 2307.
  • Friday, 3/3/2017 - GRS Tr - Time: 00:30
    • The Great Red Spot transits the center of Jupiter's disk at 0047.
  • Saturday, 3/4/2017 - Occ of theta-1 & theta-2 Tau - Time: 14:30
    • Note: These daylight occultations require larger aperture scopes for viewing. At about 1435 the mag 3.8 star theta-1 Tauri will disappear behind the moon's dark limb 79° from the north cusp. Then, at about 1436 the mag 3.4 star theta-2 Tauri will disappear behind the moon's dark limb 81° from the south cusp. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Saturday, 3/4/2017 - Occ of Aldebaran - Time: 19:00
    • At about 1902 the mag 0.9 red-orange star Aldebaran (alpha Tauri) will disappear behind the moon's dark limb 65° from the north cusp. Then, at about 2015 Aldebaran will reappear from behind the bright limb at axis angle 292°, or 68° from the north cusp. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Sunday, 3/5/2017 - Eur Sh/Sat Tr - Time: 02:30
    • Europa's shadow transits Jupiter from 0254 to 0524, followed by Europa itself starting at 0428 (and still in progress at sunrise). Note that the Great Red Spot is visible during the early part of the shadow transit.
  • Sunday, 3/5/2017 - GRS Tr - Time: 02:30
    • The Great Red Spot transits the center of Jupiter's disk at 0226.
  • Sunday, 3/5/2017 - 1st Qtr - Time: 03:30
    • -
  • Sunday, 3/5/2017 - GRS Tr - Time: 22:00
    • The Great Red Spot transits the center of Jupiter's disk at 2217.
  • Monday, 3/6/2017 - Algol min - Time: 04:30
    • Algol eclipse minimum is at 0418.
  • Monday, 3/6/2017 - Eur EcD/OcR - Time: 22:00
    • Europa disappears into Jupiter's shadow 0.4 Jupiter diameter west of Jupiter at 2202, then reappears from behind Jupiter's east limb at 0152.
  • Tuesday, 3/7/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0404.
  • Tuesday, 3/7/2017 - Occ of 74 Gem - Time: 21:30
    • At about 2158 the mag 5.0 star 74 Geminorum will disappear behind the moon's dark limb 89° from the south cusp. 74 Gem is an extremely close equal double, which may be detectable for those with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Tuesday, 3/7/2017 - GRS Tr - Time: 24:00
    • The Great Red Spot transits the center of Jupiter's disk at 2355.
  • Thursday, 3/9/2017 - Io Sh/Sat Tr - Time: 00:30
    • Io's shadow transits Jupiter from 0054 to 0306 followed by Io itself from 0134 to 0345.
  • Thursday, 3/9/2017 - Algol min - Time: 01:00
    • Algol eclipse minimum is at 0108.
  • Thursday, 3/9/2017 - Gan Tr & Io EcD/OcR - Time: 21:30
    • Ganymede transits Jupiter's north polar region from 2130 (Jupiter altitude 9° calculated for RFO site) to 2329. Meanwhile, Io disappears into Jupiter's shadow 0.25 Jupiter disk width west of Jupiter at 2201 and reappears from behind Jupiter's east limb at 0052, by which time the Great Red Spot has come into view in Jupiter's southeast.
  • Friday, 3/10/2017 - GRS Tr - Time: 01:30
    • The Great Red Spot transits the center of Jupiter's disk at 0132.
  • Friday, 3/10/2017 - Mn vnr Regulus - Time: 19:30
    • Use binoculars to view the moon very near the very bright blue star Regulus in Leo.
  • Friday, 3/10/2017 - GRS Tr & Io Sh/Sat Tr - Time: 21:30
    • The Great Red Spot transits the center of Jupiter's disk at 2123. Io and its shadow are both transiting as Jupiter rises about an hour earlier. The shadow transit ends at 2134 and Io's transit ends at 2211. Note that Jupiter's altitude at 2123 (calculated for RFO site) is 8°.
  • Saturday, 3/11/2017 - Algol min - Time: 22:00
    • Algol eclipse minimum is at 2157.
  • Sunday, 3/12/2017 - DST begins - Time: 02:00
    • -
  • Sunday, 3/12/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0410.
  • Sunday, 3/12/2017 - "Worm" Moon - Time: 08:00
    • -
  • Sunday, 3/12/2017 - GRS Tr - Time: 24:00
    • The Great Red Spot transits the center of Jupiter's disk at 0001.
  • Tuesday, 3/14/2017 - Eur EcD/OcR - Time: 01:30
    • At 0136 Europa disappears into Jupiter's shadow 0.33 Jupiter diameter west of Jupiter. Then Europa reappears from behind Jupiter's east limb at 0509, by which time the Great Red Spot has appeared in the southeast of Jupiter.
  • Tuesday, 3/14/2017 - GRS Tr - Time: 05:30
    • The Great Red Spot transits the center of Jupiter's disk at 0548.
  • Tuesday, 3/14/2017 - Mn vnr Jup - Time: 06:00
    • -
  • Tuesday, 3/14/2017 - Algol min - Time: 20:00
    • Algol eclipse minimum is at 1946.
  • Wednesday, 3/15/2017 - GRS Tr - Time: 01:30
    • The Great Red Spot transits the center of Jupiter's disk at 0140.
  • Wednesday, 3/15/2017 - Zod Light in W thru 3/28 - Time: 21:00
    • Look for the zodiacal light in the west after twilight from a dark site without western light pollution. Best times to look are from about 2100 to 2130.
  • Wednesday, 3/15/2017 - Eur Sh/Sat Tr - Time: 22:00
    • In progress when Jupiter rises, Europa's shadow ends transit at 2217 (at which time Jupiter's altitude is 11° calculated for the RFO site, and the GRS is still just visible in Jupiter's soutwest), and Europa itself ends transit at 2316.
  • Thursday, 3/16/2017 - Io Sh/Sat Tr - Time: 03:30
    • Io's shadow transits Jupiter from 0347 to 0559 followed by Io itself from 0419 to 0629. Note that the GRS comes into view in the southeast about the time the shadow transit ends.
  • Thursday, 3/16/2017 - Gan Sh/Sat Tr & Io EcD/OcR - Time: 23:30
    • Ganymede's shadow transits Jupiter's north polar region from 2336 to 0205, followed by Ganymede itself from 0152 to 0351. Note that the GRS becomes visible in Jupiter's southeast around 0152 and remains visible for the rest of these events, transiting the southern hemisphere. Meanwhile, Io disappears into Jupiter's shadow at 0055 0.2 Jupiter disk width west of Jupiter, then reappears from behind Jupiter's east limb at 0337.
  • Friday, 3/17/2017 - GRS Tr - Time: 03:00
    • The Great Red Spot transits the center of Jupiter's disk at 0318.
  • Friday, 3/17/2017 - Io Sh/Sat Tr - Time: 22:00
    • Io's shadow transits Jupiter from 2215 to 0028 followed by Io itself from 2245 to 0055. Note that the GRS is visible until about the end of the shadow transit.
  • Friday, 3/17/2017 - GRS Tr - Time: 23:00
    • The Great Red Spot transits the center of Jupiter's disk at 2308.
  • Saturday, 3/18/2017 - Io OcR - Time: 22:00
    • Io reappears from behind Jupiter's east limb at 2203.
  • Sunday, 3/19/2017 - GRS Tr - Time: 05:00
    • The Great Red Spot transits the center of Jupiter's disk at 0455.
  • Monday, 3/20/2017 - GRS Tr - Time: 00:30
    • The Great Red Spot transits the center of Jupiter's disk at 0046.
  • Monday, 3/20/2017 - Vernal Equinox - Time: 03:30
    • The vernal equinox occurs at 3:28am.
  • Monday, 3/20/2017 - Mn vnr Sat - Time: 04:00
    • -
  • Monday, 3/20/2017 - Last Qtr - Time: 09:00
    • -
  • Tuesday, 3/21/2017 - Mer in W thru 4/10 - Time: 20:00
    • Mercury provides its best evening apparition of 2017, reaching a maximum altitude of 9° 45 minutes after sunset on 3/31.
  • Wednesday, 3/22/2017 - GRS Tr - Time: 02:30
    • The Great Red Spot transits the center of Jupiter's disk at 0225.
  • Wednesday, 3/22/2017 - GRS Tr - Time: 22:00
    • The Great Red Spot transits the center of Jupiter's disk at 2216.
  • Wednesday, 3/22/2017 - Eur Sh/Sat Tr - Time: 22:00
    • Europa's shadow transits Jupiter from 2223 to 0052, followed by Europa itself from 2312 to 0133. Note that the Great Red Spot is visible until about 2330.
  • Friday, 3/24/2017 - Io EcD/OcR & Gan Sh/Sat Tr - Time: 02:30
    • At 0249 Io disappears into Jupiter's shadow 0.1 Jupiter disk width west of Jupiter, with the GRS visible at Jupiter's southeast limb. Ganymede's shadow transits the north polar region from 0334 (with the GRS still visible) to 0603. Ganymede's transit begins at 0510 (with the GRS in at Jupiter's southwest limb) and is on-going at daybreak. Io reappears from behind Jupiter's east limb at 0522.
  • Friday, 3/24/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0403.
  • Friday, 3/24/2017 - GRS Tr - Time: 24:00
    • The Great Red Spot transits the center of Jupiter's disk at 2353.
  • Friday, 3/24/2017 - Io Sh/Sat Tr - Time: 24:00
    • Io's shadow transits Jupiter from 0009 to 0221 followed by Io itself from 0029 to 0239. The Great Red Spot is visible during the early portion of this event until about 0100.
  • Saturday, 3/25/2017 - Ven IC - Time: 03:00
    • This inferior conjunction of Venus is unusual in that Venus will be 8° north of the sun. This results in Venus technically (if challengingly) being viewable in both the evening and morning skies from about 3/22 to 3/24.
  • Saturday, 3/25/2017 - Io EcD/OcR - Time: 21:00
    • Io disappears into Jupiter's shadow 0.1 Jupiter diameter west of Jupiter at 2117. Note that Jupiter's altitude at this time will be 9° (calculated for the RFO site). Then Io reappears from behind Jupiter's east limb at 2348.
  • Monday, 3/27/2017 - GRS Tr - Time: 01:30
    • The Great Red Spot transits the center of Jupiter's disk at 0131.
  • Monday, 3/27/2017 - New Moon - Time: 20:00
    • -
  • Monday, 3/27/2017 - GRS Tr - Time: 21:30
    • The Great Red Spot transits the center of Jupiter's disk at 2122.
  • Tuesday, 3/28/2017 - 1.5% CrMn - Time: 20:00
    • An ultra-thin 1.5% crescent moon will be 5° high 2° north of due west 30 minutes after sunset (at 2000 calcuated for the RFO site). Use binoculars!
  • Wednesday, 3/29/2017 - GRS Tr - Time: 03:00
    • The Great Red Spot transits the center of Jupiter's disk at 0310.
  • Wednesday, 3/29/2017 - GRS Tr - Time: 23:00
    • The Great Red Spot transits the center of Jupiter's disk at 2301.
  • Thursday, 3/30/2017 - Eur Sh/Sat Tr - Time: 00:30
    • Europa's shadow transits Jupiter from 0058 to 0327, followed by Europa itself from 0127 to 0348.
  • Friday, 3/31/2017 - GRS Tr - Time: 04:30
    • The Great Red Spot transits the center of Jupiter's disk at 0448.
  • Friday, 3/31/2017 - Occ of Hyadum-I - Time: 20:00
    • At about 2027 the mag 3.7 star Hyadum-I (gamma Tauri) will disappear behind the moon's dark limb 42° from the south cusp. Then, at about 2111 it will reappear from behind the bright limb at axis angle 224° (40° from the south cusp). The reappearance event requires larger aperture scopes. Hyadum-I is a very close double so a double event may be detectable with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Friday, 3/31/2017 - Occ of 70 Tau - Time: 22:30
    • At about 2256 the mag 6.6 star 70 Tauri will disappear behind the moon's dark limb 85° from the south cusp. This event requires larger aperture scopes. 74 Gem is an extremely close equal double, which may be detectable for those with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Friday, 3/31/2017 - Eur OcR - Time: 22:30
    • Europa reappears from behind Jupiter's southeast limb at 2246.

April 2017
  • Saturday, 4/1/2017 - GRS Tr - Time: 00:30
    • The Great Red Spot transits the center of Jupiter's disk at 0038.
  • Saturday, 4/1/2017 - Io Sh/Sat Tr - Time: 02:00
    • Io's shadow transits Jupiter from 0203 to 0415, followed quite closely by Io itself from 0213 to 0423.
  • Saturday, 4/1/2017 - Mer in W thru 4/10 - Time: 20:00
    • Mercury provides its best evening apparition of 2017, reaching a maximum altitude of 9° 45 minutes after sunset on 3/31.
  • Saturday, 4/1/2017 - Occ of 115 Tau - Time: 23:30
    • At about 2337 the mag 5.4 star 115 Tauri will disappear behind the moon's dark limb 61° from the north cusp. 115 Tau is an extremely close equal double, which may be detectable for those with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Saturday, 4/1/2017 - Io EcD/OcR - Time: 23:00
    • Io disappears into Jupiter's shadow 0.1 Jupiter disk width west of Jupiter at 2311. Io reappears from behind Jupiter's east limb at 0132.
  • Sunday, 4/2/2017 - Io Sh/Sat Tr - Time: 20:30
    • Io's shadow transits Jupiter's disk from 2031 (during nautical twilight with Jupiter's altitude 7° at start) to 2243, followed very closely by Io itself from 2039 to 2249.
  • Monday, 4/3/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0216.
  • Monday, 4/3/2017 - 1st Qtr - Time: 11:30
    • -
  • Monday, 4/3/2017 - Gan EcR/OcD - Time: 21:30
    • Ganymede disappears into Jupiter's shadow 0.1 Jupiter disk diameter from the southwest polar limb at 2137 (with the GRS visible). Ganymede reappears from behind the southeast polar limb at 0014.
  • Monday, 4/3/2017 - GRS Tr - Time: 22:00
    • The Great Red Spot transits the center of Jupiter's disk at 2207.
  • Wednesday, 4/5/2017 - GRS Tr - Time: 04:00
    • The Great Red Spot transits the center of Jupiter's disk at 0355.
  • Wednesday, 4/5/2017 - Sat stat - Time: 22:00
    • Saturn begins retrograde motion.
  • Wednesday, 4/5/2017 - GRS Tr - Time: 23:30
    • The Great Red Spot transits the center of Jupiter's disk at 2346.
  • Thursday, 4/6/2017 - Eur Sh/Sat Tr - Time: 03:30
    • Occurring soon before opposition, Europa and its shadow will be extremely close and may even overlap during this event. The shadow transits Jupiter from 0335 to 0603, followed by Europa from 0342 to 0604 (during nautical twilight).
  • Thursday, 4/6/2017 - Mn Vnr Regulus - Time: 22:00
    • -
  • Friday, 4/7/2017 - GRS Tr - Time: 05:30
    • The Great Red Spot transits the center of Jupiter's disk at 0533.
  • Friday, 4/7/2017 - Jup opp - Time: 15:00
    • Jupiter is at opposition in Virgo, at mag -2.5 and a disk diameter of 44.2".
  • Friday, 4/7/2017 - Eur Ec - Time: 22:30
    • With Jupiter at opposition, its shadow and limb are virtually coincident. While technically an eclipse, the event appears as an occultation. Europa disappears behind Jupiter's southwest limb at 2236 and reappears at the southeast limb at 0104, at which time the GRS is visible.
  • Saturday, 4/8/2017 - GRS Tr - Time: 01:00
    • The Great Red Spot transits the center of Jupiter's disk at 0123.
  • Saturday, 4/8/2017 - Io Sat/Sh Tr - Time: 03:30
    • Coming very shortly after opposition, Io will overlap its shadow during this event. Io transits from 0356.4 to 0607, followed extremely closely by its shadow from 0356.5 to 0609 (ending in nautical twilight with Jupiter's altitude 9°).
  • Saturday, 4/8/2017 - GRS Tr - Time: 21:00
    • The Great Red Spot transits the center of Jupiter's disk at 2114.
  • Sunday, 4/9/2017 - Io OcD/EcR - Time: 01:00
    • Io disappears behind Jupiter's west limb at 0104 and reappears from Jupiter's shadow extremely close to Jupiter's east limb at 0319.
  • Sunday, 4/9/2017 - Io Sat/Sh Tr - Time: 22:00
    • Coming soon after opposition, Io will be followed extremely closely by its shadow, with slight overlap possible. Io transits Jupiter from 2222 to 0033, and its shadow from 2225 to 0037.
  • Monday, 4/10/2017 - Occ of Porrima - Time: 00:30
    • Note: This event requires larger aperture scopes. At about 0055 the mag 2.8 star Porrima (gamma Virginis) disappears behind the moon's dark limb 13° from the north cusp. Then, at about 0125 it reappears from behind the bright limb at axis angle 344° (or 28° from the north cusp). Porrima is a close equal double so a double event may be detectable with suitable equipment. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Monday, 4/10/2017 - GRS Tr - Time: 03:00
    • The Great Red Spot transits the center of Jupiter's disk at 0301.
  • Monday, 4/10/2017 - Mn vnr Jup - Time: 20:30
    • -
  • Monday, 4/10/2017 - Io EcR - Time: 21:30
    • Io reappears from Jupiter's shadow very close to Jupiter's east limb. (The GRS is visible in the southeast of Jupiter's disk.)
  • Monday, 4/10/2017 - GRS Tr - Time: 23:00
    • The Great Red Spot transits the center of Jupiter's disk at 2252.
  • Monday, 4/10/2017 - "Pink" Moon - Time: 23:00
    • -
  • Tuesday, 4/11/2017 - Gan OcD/EcR - Time: 01:00
    • Ganymede disappears behind Jupiter's southwest polar limb at 0127. Ganymede reappears from Jupiter's shadow 0.1 Jupiter disk diameter from Jupiter's southeast polar limb at 0404.
  • Wednesday, 4/12/2017 - GRS Tr - Time: 04:30
    • The Great Red Spot transits the center of Jupiter's disk at 0440.
  • Thursday, 4/13/2017 - GRS Tr - Time: 00:30
    • The Great Red Spot transits the center of Jupiter's disk at 0031.
  • Thursday, 4/13/2017 - GRS Tr - Time: 20:30
    • The Great Red Spot transits the center of Jupiter's disk at 2022, during nautical twilight.
  • Saturday, 4/15/2017 - Eur OcD/EcR - Time: 00:30
    • Europa will disappear behind Jupiter's southwest limb at 0051 (GRS visible in Jupiter's SE) then reappear from Jupiter's shadow 0.1 Jupiter disk diameter from the southeast limb at 0338 (GRS visible in Jupiter's SW).
  • Saturday, 4/15/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0208.
  • Saturday, 4/15/2017 - Occ of ZC2399 - Time: 02:00
    • At about 0219 the mag 4.9 star ZC2399 reappears from behind the moon's dark limb at axis angle 288° (or 68° from the north cusp). (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Saturday, 4/15/2017 - GRS Tr - Time: 22:00
    • The Great Red Spot transits the center of Jupiter's disk at 2159.
  • Sunday, 4/16/2017 - Io OcD/EcR - Time: 02:30
    • Io disappears behind Jupiter's west limb at 0248 and reappears from Jupiter's shadow 0.1 Jupiter disk diameter from Jupiter's east limb at 0513.
  • Sunday, 4/16/2017 - Mn nr Sat - Time: 05:00
    • -
  • Sunday, 4/16/2017 - Eur Sat/Sh Tr - Time: 20:30
    • Both transits are in progress at sunset. Europa's transit of Jupiter ends at 2128 and its shadow transit ends at 2157.
  • Sunday, 4/16/2017 - Io Sat/Sh Tr - Time: 24:00
    • Io transits Jupiter from 0006 to 0217 followed by its shadow from 0019 to 0231. The GRS is visible in Jupiter's southeast as the transits end.
  • Monday, 4/17/2017 - GRS Tr - Time: 03:30
    • The Great Red Spot transits the center of Jupiter's disk at 0346.
  • Monday, 4/17/2017 - Io OcD/EcR - Time: 21:00
    • Io disappears behind Jupiter's west limb at 2114 and reappears from Jupiter's shadow 0.1 Jupiter disk diameter from Jupiter's east limb at 2342 (with the GRS now visible).
  • Monday, 4/17/2017 - GRS Tr - Time: 23:30
    • The Great Red Spot transits the center of Jupiter's disk at 2337.
  • Wednesday, 4/19/2017 - Last Qtr - Time: 03:00
    • -
  • Thursday, 4/20/2017 - GRS Tr - Time: 01:00
    • The Great Red Spot transits the center of Jupiter's disk at 0116.
  • Thursday, 4/20/2017 - GRS Tr - Time: 21:00
    • The Great Red Spot transits the center of Jupiter's disk at 2108, during astronomical twilight.
  • Friday, 4/21/2017 - Gan Sh Tr - Time: 21:00
    • In progress at sunset, Ganymede's shadow ends its transit of Jupiter's north polar region at 2151.
  • Saturday, 4/22/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0205.
  • Saturday, 4/22/2017 - Eur OcD - Time: 03:00
    • Europa disappears behind Jupiter's southwest limb at 0306 (GRS visible).
  • Saturday, 4/22/2017 - Lyrids Peak - Time: 05:00
    • The Lyrid Meteor Shower is expected to peak sometime this night, probably within a few hours of 5am. Meteor viewing is favorable from about 10pm until crescent moonrise at 0418. About 18 meteors per hour may occur at peak, but activity can vary greatly.
  • Saturday, 4/22/2017 - GRS Tr - Time: 22:30
    • The Great Red Spot transits the center of Jupiter's disk at 2245.
  • Sunday, 4/23/2017 - CrMn nr Ven - Time: 05:30
    • -
  • Sunday, 4/23/2017 - Eur Sat/Sh Tr - Time: 21:00
    • Europa transits Jupiter's disk from 2120 to 2345 followed by its shadow from 2206 to 0033.
  • Monday, 4/24/2017 - Io Sat/Sh Tr - Time: 01:30
    • Io transits Jupiter from 0150 to 0401 followed by its shadow from 0213 to 0425. The GRS is visible starting around 3am.
  • Monday, 4/24/2017 - GRS Tr - Time: 04:30
    • The Great Red Spot transits the center of Jupiter's disk at 0432.
  • Monday, 4/24/2017 - Io OcD/EcR - Time: 22:30
    • Io disappears behind Jupiter's west limb at 2259 (GRS in Jupiter's SE) and reappears from Jupiter's shadow 0.15 Jupiter disk diameter from Jupiter's east limb at 0136 (GRS in Jupiter's SW).
  • Tuesday, 4/25/2017 - GRS Tr - Time: 00:30
    • The Great Red Spot transits the center of Jupiter's disk at 0023.
  • Tuesday, 4/25/2017 - Io Sat/Sh Tr - Time: 20:30
    • Io's transit of Jupiter is in progress as Jupiter becomes visible in twilight and it ends at 2227. Io's shadow transits from 2041 to 2253. The GRS is visible until about 2150.
  • Wednesday, 4/26/2017 - New Moon - Time: 05:00
    • -
  • Thursday, 4/27/2017 - Lrg Tides thru 4/29 - Time: 00:00
    • Large tides caused by the new moon 28 hours before perigee.
  • Thursday, 4/27/2017 - GRS Tr - Time: 02:00
    • The Great Red Spot transits the center of Jupiter's disk at 0202.
  • Thursday, 4/27/2017 - 4.3% CrMn - Time: 20:30
    • -
  • Thursday, 4/27/2017 - GRS Tr - Time: 22:00
    • The Great Red Spot transits the center of Jupiter's disk at 2153.
  • Friday, 4/28/2017 - Gan Sat/Sh Tr - Time: 21:30
    • Ganymende transits Jupiter's north polar region from 2130 to 2343, followed by its shadow from 2325 to 0149 (by which time the GRS becomes visible in Jupiter's SE).
  • Saturday, 4/29/2017 - GRS Tr - Time: 03:30
    • The Great Red Spot transits the center of Jupiter's disk at 0340.
  • Saturday, 4/29/2017 - Ven brightest - Time: 21:00
    • Venus reaches magnitude -4.7.
  • Saturday, 4/29/2017 - GRS Tr - Time: 23:30
    • The Great Red Spot transits the center of Jupiter's disk at 2330.

May 2017
  • Tuesday, 5/2/2017 - 1st Qtr - Time: 20:00
    • -
  • Wednesday, 5/10/2017 - "Flower" Moon - Time: 14:30
    • -
  • Thursday, 5/18/2017 - Last Qtr - Time: 17:30
    • -
  • Thursday, 5/25/2017 - New Moon - Time: 12:30
    • -

June 2017
  • Thursday, 6/1/2017 - 1st Qtr - Time: 05:30
    • -
  • Friday, 6/9/2017 - "Strawberry" Moon - Time: 06:00
    • -
  • Friday, 6/9/2017 - Jup stat - Time: 22:00
    • Jupiter ends retrograde motion.
  • Thursday, 6/15/2017 - Sat opp - Time: 03:00
    • -
  • Saturday, 6/17/2017 - Last Qtr - Time: 04:30
    • -
  • Tuesday, 6/20/2017 - Summer Solstice - Time: 21:30
    • The summer solstice occurs at 9:24pm.
  • Friday, 6/23/2017 - New Moon - Time: 19:30
    • -
  • Friday, 6/30/2017 - 1st Qtr - Time: 17:30
    • -

July 2017
  • Saturday, 7/8/2017 - "Buck" Moon - Time: 21:00
    • -
  • Sunday, 7/9/2017 - Plu opp - Time: 21:00
    • -
  • Sunday, 7/16/2017 - Last Qtr - Time: 12:30
    • -
  • Sunday, 7/23/2017 - New Moon - Time: 02:30
    • -
  • Sunday, 7/30/2017 - 1st Qtr - Time: 08:30
    • -

August 2017
  • Thursday, 8/3/2017 - Ura stat - Time: 02:00
    • Uranus begins retrograde motion.
  • Monday, 8/7/2017 - "Sturgeon" Moon - Time: 11:00
    • -
  • Saturday, 8/12/2017 - Perseids Peak - Time: 12:00
    • This is a very unfavorable year for Perseid meteor viewing with a gibbous moon during morning hours and the peak predicted during daylight hours locally.
  • Monday, 8/14/2017 - Last Qtr - Time: 18:00
    • -
  • Monday, 8/21/2017 - New Moon - Time: 11:30
    • -
  • Friday, 8/25/2017 - Sat stat - Time: 07:00
    • Saturn ends retrograde motion.
  • Tuesday, 8/29/2017 - 1st Qtr - Time: 01:00
    • -

September 2017
  • Monday, 9/4/2017 - Nep opp - Time: 22:00
    • -
  • Wednesday, 9/6/2017 - "Harvest" Moon - Time: 00:30
    • -
  • Tuesday, 9/12/2017 - Last Qtr - Time: 23:30
    • -
  • Tuesday, 9/19/2017 - Ura Opp - Time: 10:00
    • -
  • Tuesday, 9/19/2017 - New Moon - Time: 22:30
    • -
  • Friday, 9/22/2017 - Autumnal Equinox - Time: 13:00
    • The autumnal equinox occurs at 1:02pm.
  • Wednesday, 9/27/2017 - 1st Qtr - Time: 20:00
    • -

October 2017
  • Thursday, 10/5/2017 - "Hunter's" Moon - Time: 11:30
  • Thursday, 10/12/2017 - Last Qtr - Time: 05:30
    • -
  • Thursday, 10/19/2017 - New Moon - Time: 12:00
    • -
  • Saturday, 10/21/2017 - Orionids Peak - Time: 04:00
    • Conditions are very favorable for the Orionid Meteor Shower. Rates of about 20 meteors per hour are expected at the peak and off-peak outbursts are possible.
  • Friday, 10/27/2017 - 1st Qtr - Time: 15:30
    • -

November 2017
  • Friday, 11/3/2017 - "Beaver" Moon - Time: 10:30
  • Sunday, 11/5/2017 - DST Ends - Time: 02:00
    • -
  • Friday, 11/10/2017 - Last Qtr - Time: 12:30
    • -
  • Friday, 11/17/2017 - Leonids Peak - Time: 08:30
    • While moon conditions are very favorable, meteor activity is expected to be low this year with only about 10 per hour at the peak, which is likely in daylight hours locally. But unexpected activity is always possible. Meteors are viewable after midnight until about 0530.
  • Saturday, 11/18/2017 - New Moon - Time: 03:30
    • -
  • Sunday, 11/26/2017 - 1st Qtr - Time: 09:00
    • -

December 2017
  • Sunday, 12/3/2017 - "Cold" Moon - Time: 08:00
    • -
  • Saturday, 12/9/2017 - Last Qtr - Time: 24:00
    • -
  • Wednesday, 12/13/2017 - Geminids Peak - Time: 22:30
    • Conditions are highly favorable for this strong meteor shower with rates of about 120 meteors per hour lasting for a long time around the peak. The meteors are viewable all night. The crescent moon rises at about 4am on 12/14, interfering somewhat.
  • Sunday, 12/17/2017 - New Moon - Time: 22:30
    • -
  • Thursday, 12/21/2017 - Winter Solstice - Time: 08:30
    • The winter solstice occurs at 8:28am.
  • Friday, 12/22/2017 - Ursids Peak - Time: 07:00
    • Conditions are very favorable for this modest meteor shower with about 10 per hour at peak, though there have been rare outbursts of up to 50. The meteors are viewable all night until after twilight starts around 6am.
  • Tuesday, 12/26/2017 - 1st Qtr - Time: 01:30
    • -

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