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

May 2019
  • Thursday, 5/2/2019 - Io Sh/Sat Tr - Time: 02:00
    • Io's shadow transits Jupiter from 0228 to 0440 followed by Io from 0319 to 0531. (The transits end during twilight.)
  • Friday, 5/3/2019 - Io OcR - Time: 01:30
    • Io reappears from behind Jupiter's east limb at 0130.
  • Friday, 5/3/2019 - Eur Sh/Sat Tr - Time: 03:00
    • Europa's shadow transits Jupiter from 0306 to 0530 followed by Europa starting at 0445. These last two events are during twilight and Europa's transit ends after sunrise.
  • Saturday, 5/4/2019 - New Moon - Time: 15:30
    • -
  • Sunday, 5/5/2019 - Eur OcR - Time: 02:00
    • Europa reappears from behind Jupiter's SE limb at 0206.
  • Sunday, 5/5/2019 - 1.6% CrMn - Time: 20:00
    • Look for an ultra-thin 1.6% crescent moon 7° high 15° north of due west 20 minutes after sunset (or at 2025 calculated for the RFO site). Use binoculars.
  • Monday, 5/6/2019 - Occ of ZC718 - Time: 20:30
    • At about 2044 the magnitude 6.0 star ZC718 will disappear behind the moon's dark limb 60° from the south cusp. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Monday, 5/6/2019 - 5.2% CrMn - Time: 21:00
    • -
  • Tuesday, 5/7/2019 - Gan Sh/Sat Tr - Time: 00:30
    • Ganymede's shadow transits Jupiter from 0040 to 0256, followed by Ganymede starting at 0350 (ending after sunrise).
  • Tuesday, 5/7/2019 - CrMn nr Mar - Time: 21:30
    • -
  • Thursday, 5/9/2019 - Io Sh Tr - Time: 04:30
    • Io's shadow begins transiting Jupiter at 0431. (Io itself begins transiting at 0505, during twilight, and both are in progress at sunrise.)
  • Friday, 5/10/2019 - Io EcD/OcR - Time: 01:30
    • Io disappears into Jupiter's shadow 0.3 Jupiter diameter west of Jupiter at 0131, then reappears from behind Jupiter's east limb at 0426.
  • Friday, 5/10/2019 - Io Sh/Sat Tr - Time: 23:00
    • Io's shadow is in transit starting shortly after Jupiter rises. Io begins transiting at 2332. The shadow transit ends at 0102 and the transit ends at 0143.
  • Saturday, 5/11/2019 - 1st Qtr - Time: 18:00
    • -
  • Sunday, 5/12/2019 - Eur EcD/OcR - Time: 00:30
    • At 0036 Europa disappears into Jupiter's shadow 0.4 Jupiter diameter west of the planet, then reappears from behind the southeast limb at 0425.
  • Friday, 5/17/2019 - Io EcD - Time: 03:00
    • At 0325 Io disappears into Jupiter's shadow 0.2 Jupiter diameter west of Jupiter.
  • Friday, 5/17/2019 - Gan OcR - Time: 23:00
    • At 2316, Ganymede emerges from behind Jupiter's SE polar limb.
  • Saturday, 5/18/2019 - Io Sh/Sat Tr - Time: 00:30
    • Io's shadow transits Jupiter from 0043 to 0256, followed by Io from 0117 to 0329.
  • Saturday, 5/18/2019 - "Flower" Moon - Time: 14:00
    • -
  • Sunday, 5/19/2019 - Io OcR - Time: 00:30
    • Io emerges from behind Jupiter's east limb at 0037.
  • Sunday, 5/19/2019 - Eur EcD - Time: 03:00
    • Europa disappears into Jupiter's shadow 0.3 Jupiter diameter west of Jupiter at 0312.
  • Monday, 5/20/2019 - Mn nr Jup - Time: 04:30
    • -
  • Monday, 5/20/2019 - Eur Sh/Sat Tr - Time: 22:00
    • Jupiter rises with Europa's shadow in transit. Europa begins to transit at 2227 (Jupiter will still be low in the SE). The shadow transit ends at 2355 and the transit ends at 0052.
  • Thursday, 5/23/2019 - Mn nr Sat - Time: 01:00
    • -
  • Friday, 5/24/2019 - Gan EcD - Time: 22:30
    • Ganymede disappears into Jupiter's shadow 0.3 Jupiter diameter west of Jupiter at 2230. (Note: Jupiter's altitude will be about 10° in SE in RFO region.)
  • Saturday, 5/25/2019 - Gan OcR & Io Sh/Sat Tr - Time: 02:30
    • Ganymede emerges from behind Jupiter's SE polar limb at 0236. Io's shadow transits from 0237 to 0450 followed by Io from 0301 to 0513. Note: Io will be about 0.2 Jupiter diameter behind its shadow during the transits, which end during twilight.
  • Sunday, 5/26/2019 - Last Qtr - Time: 09:30
    • -
  • Sunday, 5/26/2019 - Io Sh/Sat Tr - Time: 22:00
    • Jupiter rises with the transits in progress. By 2230 the transits will be about mid-way, with Io following its shadow by about 0.2 Jupiter diameter. The shadow transit ends at 2319 and the transit ends at 2339.
  • Monday, 5/27/2019 - Eur Sh/Sat Tr - Time: 24:00
    • Early on the morning of 5/28, Europa's shadow transits Jupiter from 0003 to 0230 followed by Europa from 0042 to 0307. Note: Europa follows its shadow by about 0.25 Jupiter diameter.
  • Tuesday, 5/28/2019 - Occ of mu Cet - Time: 05:00
    • At about 0509 the magnitude 4.3 star mu Ceti reappears from behind the moon's dark limb at axis angle 255° (or 80° from the south cusp). Mu Cet is a very close double star. (Calculated using Occult4 for the RFO site. Details will differ as distance from RFO increases.)
  • Tuesday, 5/28/2019 - Ceres at opp - Time: 16:00
    • The dwarf planet Ceres is at opposition in Ophiuchus, near the star chi Oph (consult references) at magnitude 7.0.
  • Wednesday, 5/29/2019 - Eur OcR - Time: 22:00
    • Europa reappears from behind Jupiter's SW limb at 2208. Note: Jupiter will be 8° high in the SE (calculated for RFO).

June 2019
  • Saturday, 6/1/2019 - Gan EcD - Time: 02:30
    • Ganymede disappears into Jupiter's shadow about 0.2 Jupiter diameter west of Jupiter's SW polar limb at 0242.
  • Sunday, 6/2/2019 - Io EcD - Time: 01:30
    • Io disappears into Jupiter's shadow about 0.1 Jupiter diameter west of of Jupiter at 0141.
  • Sunday, 6/2/2019 - Mer in W thru 7/2 - Time: 21:00
    • Mercury provides a very good evening apparition, reaching a maximum altitude 45 minutes after sunset of 10° on 6/17. Mercury is near Mars throughout with the two extremely close on 6/17. (You may need binoculars to spot the dimmer but distinctively red Mars.) The crescent moon joins this pair on 6/4 and 6/5. As always with evening apparitions, Mercury is brightest early on and then fades considerably in the last days. Start looking about 35 minutes after sunset.
  • Sunday, 6/2/2019 - Io Sh/Sat Tr - Time: 23:00
    • Io's shadow transits Jupiter from 2300 to 0113 followed by Io (about 0.1 Jupiter diameter behind the shadow) from 2311 to 0123.
  • Monday, 6/3/2019 - New Moon - Time: 03:00
    • -
  • Monday, 6/3/2019 - Io OcR - Time: 22:30
    • Io emerges from behind Jupiter's east limb at 2231.
  • Sunday, 6/9/2019 - 1st Qtr - Time: 23:00
    • -
  • Monday, 6/10/2019 - Jup opp - Time: 08:00
    • Jupiter is at opposition in Ophiuchus.
  • Monday, 6/17/2019 - "Strawberry" Moon - Time: 01:30
    • -
  • Friday, 6/21/2019 - Summer Solstice - Time: 09:00
    • The solstice occurs at 8:54am.
  • Friday, 6/21/2019 - Nep stat - Time: 21:00
    • Neptune begins retrograde motion.
  • Tuesday, 6/25/2019 - Last Qtr - Time: 03:00
    • -

July 2019
  • Tuesday, 7/2/2019 - New Moon - Time: 12:00
    • -
  • Tuesday, 7/9/2019 - 1st Qtr - Time: 04:00
    • -
  • Tuesday, 7/9/2019 - Sat opp - Time: 22:00
    • Saturn is at opposition in Sagittarius.
  • Tuesday, 7/16/2019 - "Buck" Moon - Time: 14:30
    • -
  • Wednesday, 7/24/2019 - Last Qtr - Time: 18:30
    • -
  • Wednesday, 7/31/2019 - New Moon - Time: 20:00
    • -

August 2019
  • Thursday, 8/1/2019 - Large Tides thru 8/3 - Time: 00:00
    • Large tides due to new moon 28 hours before perigee.
  • Wednesday, 8/7/2019 - 1st Qtr - Time: 10:30
    • -
  • Sunday, 8/11/2019 - Jup stat - Time: 09:00
    • Jupiter ends retrograde motion.
  • Sunday, 8/11/2019 - Ura stat - Time: 22:00
    • Uranus begins retrograde motion.
  • Tuesday, 8/13/2019 - Ven SC - Time: 23:00
    • -
  • Thursday, 8/15/2019 - "Sturgeon" Moon - Time: 05:30
    • -
  • Friday, 8/23/2019 - Last Qtr - Time: 08:00
    • -
  • Friday, 8/30/2019 - Large Tides thru 9/2 - Time: 00:00
    • Large tides due to new moon 6 hours before perigee.
  • Friday, 8/30/2019 - New Moon - Time: 03:30
    • -

September 2019
  • Sunday, 9/1/2019 - Large Tides thru 9/2 - Time: 00:00
    • Large tides due to new moon 6 hours before perigee.
  • Thursday, 9/5/2019 - 1st Qtr - Time: 20:00
    • -
  • Tuesday, 9/10/2019 - Nep opp - Time: 24:00
    • Neptune is at opposition in Aquarius.
  • Friday, 9/13/2019 - "Harvest" Moon - Time: 21:30
    • -
  • Tuesday, 9/17/2019 - Sat stat - Time: 23:00
    • Saturn ends retrograde motion.
  • Saturday, 9/21/2019 - Last Qtr - Time: 19:30
    • -
  • Monday, 9/23/2019 - Autumnal Equinox - Time: 01:00
    • The equinox occurs at 12:50am.
  • Saturday, 9/28/2019 - New Moon - Time: 11:30
    • -
  • Sunday, 9/29/2019 - Large Tides thru 10/2 - Time: 00:00
    • Large tides due to new moon 16 hours after perigee.

October 2019
  • Tuesday, 10/1/2019 - Large Tides thru 10/2 - Time: 00:00
    • Large tides due to new moon 16 hours after perigee.
  • Saturday, 10/5/2019 - 1st Qtr - Time: 10:00
    • -
  • Sunday, 10/13/2019 - "Hunter's" Moon - Time: 14:00
    • -
  • Monday, 10/21/2019 - Last Qtr - Time: 05:30
    • -
  • Sunday, 10/27/2019 - New Moon - Time: 20:30
    • -
  • Monday, 10/28/2019 - Ura opp - Time: 01:00
    • Uranus is at opposition in Aries.

November 2019
  • Sunday, 11/3/2019 - DST ends - Time: 02:00
    • -
  • Monday, 11/4/2019 - 1st Qtr - Time: 02:30
    • -
  • Tuesday, 11/12/2019 - "Beaver" Moon - Time: 05:30
    • -
  • Tuesday, 11/19/2019 - Last Qtr - Time: 13:00
    • -
  • Tuesday, 11/26/2019 - New Moon - Time: 07:00
    • -
  • Wednesday, 11/27/2019 - Nep stat - Time: 12:00
    • Neptune ends retrograde motion.

December 2019
  • Tuesday, 12/3/2019 - 1st Qtr - Time: 23:00
    • -
  • Wednesday, 12/11/2019 - "Cold" Moon - Time: 21:00
    • -
  • Wednesday, 12/18/2019 - Last Qtr - Time: 21:00
    • -
  • Saturday, 12/21/2019 - Winter Solstice - Time: 20:30
    • The solstice occurs at 8:19pm.
  • Wednesday, 12/25/2019 - New Moon - Time: 21:00
    • -

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