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 - Astronomical Twilight
Civ Twi - Civil Twilight
Cr - Crescent
Dbl Tr - Double Tansit
Ex - Exit
Gr El - Greatest Elongation
Jup - Jupiter
Mer - Mercury
Min - Minimum
Naut Twi - Nautical Twilight
Nr - Near
Occ - Occultation
Opp - Opposition
Reap - Reappear
Qtr - Quarter
Sat - Saturn
Sh - Shadow
Stat - Stationary
V Nr - Very Near
Ven - Venus
Zod Lt - Zodiacal Light

 

Observing

2015 Observing Highlights

March 2015
  • Monday, 3/2/2015 - Io occ Eur - Time: 03:00
    • This is a Jovian mutual satellite event. From 3:20 to 3:22am Io will slightly occult Europa. The E to W Jovian arrangement just before occultation is:
      Gan - Jup - Io/Eur - Cal
      Note: Earlier this might, from 12:00am to 2:51am, Io and its shadow will transit Jupiter.
  • Monday, 3/2/2015 - Io ecl Eur - Time: 04:00
    • This is a Jovian mutual satellite event. From 4:08 to 4:12am Io, moving east to west, will eclipse Europa with maximum dimming of 22% at 4:09.9am. This is a deep penumbral eclipse. The E to W Jovian arrangement just before eclipse is:
      Gan - Jup - Eur - Io - Cal
      Larger aperture scopes at high magnification should try to view the penumbral shadow on Europa's disk. Note that Europa will be near Jupiter's limb.
  • Monday, 3/2/2015 - Gan occ Io - Time: 20:00
    • This is a Jovian mutual satellite event. Ganymede, moving east to west, will totally occult Io from 8:06 to 8:11pm. Ganymede's shadow will be in transit (from Jupiter rise until 8:43pm). The E to W Jovian arrangement just before occultation is:
      Eur - Jup - Gan/Io - Cal
      Begin observing by about 7:50pm to watch Ganymede and Io approach.
  • Monday, 3/2/2015 - Mn nr Jup - Time: 24:00
    • -
  • Tuesday, 3/3/2015 - Algol min - Time: 05:30
    • Algol minimum is at 5:24am.
  • Wednesday, 3/4/2015 - Occ of pi Leo - Time: 03:00
    • At about 3:28am mag 4.7 pi Leonis will disappear behind the nearly full moon's dark limb 63° from the north cusp. Calculated using Occult4 for the RFO site. Details will vary as distance from RFO increases.
  • Wednesday, 3/4/2015 - Ven v nr Ura - Time: 19:30
    • Uranus will be very close to Venus this evening. Use binoculars or a scope to spot cyan blue Uranus less than half a degree below (west of) Venus.
  • Thursday, 3/5/2015 - "Worm" Moon - Time: 10:00
    • Occurring 10 hours after apogee, this is the smallest full moon of 2015.
  • Thursday, 3/5/2015 - Io occ Gan - Time: 20:30
    • This is a Jovian mutual satellite event. Io, moving east to west, will occult Ganymede from 8:51 to 8:58pm. This is an annular occultation and there should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Maximum annularity is at 8:54.3pm The E to W Jovian arrangement just before occultation is:
      Jup - Io/Gan - Cal
      Begin observing by about 8:30pm to watch Io approach Ganymede. Note: Europa will reappear from Jupiter eclipse east of Jupiter at 9:58pm, then Io will eclipse Ganymede a bit later.
  • Thursday, 3/5/2015 - Io ecl Gan - Time: 22:30
    • This is a Jovian mutual satellite event. From 10:35 to 10:46pm Ganymede, moving west to east, will pass through Io's shadow for a nearly perfectly centered annular eclipse with maximum dimming of 49% at 10:40.3pm. The E to W Jovian arrangement just before eclipse is:
      Eur - Jup - Gan - Cal - Io
      Larger aperture scopes at high magnification should try to view the umbral shadow on Ganymede's disk.
  • Friday, 3/6/2015 - Algol min - Time: 02:00
    • Algol minimum is at 2:13am.
  • Saturday, 3/7/2015 - Eur occ Cal - Time: 03:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will occult Callisto from 3:21 to 3:29am. This is a nearly perfectly centered annular occultation and there may be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Maximum annularity is at 3:25.0am The E to W Jovian arrangement just before occultation is:
      Gan - Eur/Cal - Io - Jup
      Begin observing before 3am to watch Europa approach Callisto.
  • Saturday, 3/7/2015 - Eur occ Io - Time: 22:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult (nearly annular) Io from 10:15 to 10:21pm. There should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. The E to W Jovian arrangement just before occultation is:
      Gan - Cal - Jup - Eur/Io
      Begin observing before 10pm to watch Europa approach Io.
  • Saturday, 3/7/2015 - Eur ecl Io - Time: 23:00
    • This is a Jovian mutual satellite event. From 11:21 to 11:27pm Europa, moving east to west, will eclipse Io. This is an annular eclipse with maximum dimming of 62% at 10:24.0pm. The E to W Jovian arrangement just before eclipse is:
      Gan - Cal - Jup - Io - Eur
      Larger aperture scopes at high magnification should try to view the umbral shadow on Io's disk.
  • Sunday, 3/8/2015 - Gan occ Cal - Time: 01:00
    • This is a Jovian mutual satellite event. From 1:27 to 1:49am PST Callisto, moving west to east, will pass behind Ganymede for a substantial partial occultation. The E to W Jovian arrangement just before occultation is:
      Gan/Cal - Jup - Io - Eur
      Begin observing before 1am to watch Ganymede and Callisto approach.
  • Sunday, 3/8/2015 - DST begins - Time: 02:00
    • -
  • Sunday, 3/8/2015 - Zod Light in W thru 3/21 - 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 8:45 to 9:30pm.
  • Sunday, 3/8/2015 - Algol min - Time: 24:00
    • Algol minimum is at 12:02am (on 3/9).
  • Monday, 3/9/2015 - Gan occ Io - Time: 23:30
    • This is a Jovian mutual satellite event. Io, moving west to east, will pass behind Ganymede for a total occultation from 11:30 to 11:36pm. The pair will be very near Jupiter's west limb. Ganymede's shadow will be in transit during this event. The E to W Jovian arrangement just before occultation is:
      Cal - Eur - Jup - Gan/Io
      Begin observing by about 11:10pm to watch Ganymede and Io approach.
  • Wednesday, 3/11/2015 - Algol min - Time: 21:00
    • Algol minimum is at 8:51pm.
  • Thursday, 3/12/2015 - Mn nr Sat - Time: 02:00
    • -
  • Thursday, 3/12/2015 - Io ecl Eur - Time: 20:00
    • This is a Jovian mutual satellite event. From 8:27 to 8:31pm Io, moving east to west, will partially eclipse Europa with maximum dimming of 45%. Europa will be near Jupiter's limb. The E to W Jovian arrangement just before eclipse is:
      Cal - Jup - Eur - Io - Gan
      Larger aperture scopes at high magnification should try to view the umbral shadow graze the southern part of Europa's disk.
  • Friday, 3/13/2015 - Io occ Gan - Time: 00:30
    • This is a Jovian mutual satellite event. Io, moving east to west, will occult Ganymede from 12:31 to 12:39am. This partial occultation is nearly annular and there should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Maximum eclipse is at 12:35.3am The E to W Jovian arrangement just before occultation is:
      Cal - Jup - Io/Gan (Europa eclipsed by Jupiter)
      Begin observing before 12:10am to watch Io approach Ganymede.
  • Friday, 3/13/2015 - Io ecl Gan - Time: 02:30
    • This is a Jovian mutual satellite event. From 2:52 to 3:05am Ganymede, moving west to east, will pass through Io's shadow for an annular eclipse with maximum dimming of 52% at 2:58.9am. The E to W Jovian arrangement just before eclipse is:
      Cal - Eur - Jup - Gan - Io
      Larger aperture scopes at high magnification should try to view the umbral shadow on Ganymede's disk.
  • Friday, 3/13/2015 - Last Qtr - Time: 11:00
    • -
  • Saturday, 3/14/2015 - Io ecl Gan - Time: 00:30
    • This is a Jovian mutual satellite event. From 12:50 to 1:10am Ganymede, moving west to east, will pass through Io's shadow for a well-centered annular eclipse with maximum dimming of 52% at 1:00.2am. The E to W Jovian arrangement just before eclipse is:
      Eur - Cal - Gan - Io - Jup
      Larger aperture scopes at high magnification should try to view the umbral shadow on Ganymede's disk.
  • Saturday, 3/14/2015 - Sat stat - Time: 15:00
    • Saturn, in Scorpius, begins retrograde motion.
  • Sunday, 3/15/2015 - Eur occ Io - Time: 01:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will substantially partially occult Io from 1:21 to 1:27am. There should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Maximum eclipse is at 1:24.1am The E to W Jovian arrangement just before occultation is:
      Gan - Jup - Cal - Eur/Io
      Begin observing before 10pm to watch Europa approach Io.
  • Sunday, 3/15/2015 - Eur ecl Io - Time: 02:30
    • This is a Jovian mutual satellite event. From 2:39 to 2:45am Europa, moving east to west, will partially (nearly annular) eclipse Io with maximum dimming of 49% at 2:42.1am. The E to W Jovian arrangement just before eclipse is:
      Gan - Jup - Cal - Io - Eur
      Larger aperture scopes at high magnification should try to view the umbral shadow on Io's disk. Note: Callisto's shadow will be in transit beginning at 2:12am.
  • Sunday, 3/15/2015 - Cal ecl Eur - Time: 23:30
    • This is a Jovian mutual satellite event. Callisto, moving east to west, will partially eclipse Europa from 11:46 to 11:58pm with maximum dimming of 39% at 11:52.4pm. The E to W Jovian arrangement just before the eclipse is:
      Gan - Io - Jup - Eur - Cal
      While "partial," the umbra is very small and just grazes the north edge of Europa so this is largely a penumbral eclipse.
  • Monday, 3/16/2015 - Gan ecl Eur - Time: 19:30
    • This is a Jovian mutual satellite event. From 7:49 to 7:57pm Ganymede, moving east to west, will eclipse Europa with maximum dimming of 32% at 7:53.1pm. While partial, this is nearly an annular eclipse. The E to W Jovian arrangement just before eclipse is:
      Eur - Gan - Jup - Io - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on Europa's disk.
  • Thursday, 3/19/2015 - Io ecl Eur - Time: 22:30
    • This is a Jovian mutual satellite event. From 10:40 to 10:45pm Io, moving east to west, will partially eclipse Europa with maximum dimming of 62%. The E to W Jovian arrangement just before eclipse is:
      Jup - Eur - Io - Gan - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on the south part of Io's disk. Note that Europa will be near Jupiter's limb.
  • Friday, 3/20/2015 - Lrg Tides thru 3/23 - Time: 00:00
    • New moon occurs 14 hours after perigee.
  • Friday, 3/20/2015 - New Moon - Time: 02:30
    • -
  • Friday, 3/20/2015 - Io occ Gan - Time: 03:00
    • This is a Jovian mutual satellite event. Io, moving east to west, will occult Ganymede from 3:23 to 3:32am. This is a substantial partial occultation and there should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Maximum occultation is at 3:27.3am The E to W Jovian arrangement just before occultation is:
      Jup - Io/Gan - Cal
      Begin observing by 3:00am to watch Io approach Ganymede. Note: Europa will reappear from Jupiter eclipse east of Jupiter at 4:08am.
  • Friday, 3/20/2015 - Vernal Equinox - Time: 15:30
    • The equinox occurs at 3:45pm.
  • Saturday, 3/21/2015 - Io occ Gan - Time: 00:30
    • This is a Jovian mutual satellite event. Ganymede, moving west to east, will pass behind Io from 12:48 to 1:09am. Maximum occultation is at 12:58am. This is a substantial partial occultation and there should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. Io is essentially stationary at maximum elongation from Jupiter, causing this to be a long lasting event. The E to W Jovian arrangement just before occultation is:
      Eur - Io/Gan - Jup - Cal
      Begin observing by 12:15am to watch Ganymede approach Io.
  • Saturday, 3/21/2015 - Io ecl Gan - Time: 04:30
    • This is a Jovian mutual satellite event. From 4:41 to 4:43am Ganymede, moving west to east, will pass through Io's shadow for an annular eclipse with maximum dimming of 42% at 4:46.8am. The E to W Jovian arrangement just before eclipse is:
      Eur - Gan - Io - Jup - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on the northern part of Ganymede's disk.
  • Saturday, 3/21/2015 - 4.5% Cr Mn nr Mar - Time: 20:00
    • Look for a very thin crescent moon near Mars 37 minutes after sunset (or at 8:00pm calculated for RFO). Use binoculars.
  • Sunday, 3/22/2015 - Eur occ Io - Time: 03:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 3:29 to 3:34am. There should be a noticeable color difference between the disks for large aperture scopes at high magnification so the view could be dramatic. The E to W Jovian arrangement just before occultation is:
      Gan - Jup - Eur/Io - Cal
      Begin observing before 3:15am to watch Europa approach Io.
  • Sunday, 3/22/2015 - Cr Mn nr Ven - Time: 20:30
    • -
  • Monday, 3/23/2015 - Gan occ Eur - Time: 20:00
    • This is a Jovian mutual satellite event and occurs during twilight. Jupiter is at altitude 55°, azimuth 117° at 8pm. Ganymede, moving east to west, will slightly occult Europa from 8:15 to 8:17pm. The E to W Jovian arrangement just before occultation is:
      Cal - Gan/Eur - Jup - Io
      Begin observing by about 8:00pm to watch Ganymede and Europa approach.
  • Monday, 3/23/2015 - Gan ecl Eur - Time: 23:00
    • This is a Jovian mutual satellite event. From 11:04 to 11:11pm Ganymede, moving east to west, will partially but substantially eclipse Europa with maximum dimming of 50% at 11:07.4pm. The E to W Jovian arrangement just before eclipse is:
      Cal - Eur - Gan - Jup - Io
      Larger aperture scopes at high magnification should try to view the umbral shadow on the northern part of Europa's disk.
  • Tuesday, 3/24/2015 - Mn v nr Aldebaran - Time: 23:30
    • -
  • Friday, 3/27/2015 - 1st Qtr - Time: 00:30
    • -
  • Friday, 3/27/2015 - Io ecl Eur - Time: 00:30
    • This is a Jovian mutual satellite event. From 12:53 to 12:58am Io, moving east to west, will eclipse Europa with maximum dimming of 61% at 12:55.8am. This is a substantial partial eclipse. The E to W Jovian arrangement just before eclipse is:
      Cal - Jup - Eur - Io - Gan
      Larger aperture scopes at high magnification should try to view the umbral shadow on the southern part of Europa's limb.
  • Saturday, 3/28/2015 - Occ of lambda Gem - Time: 02:00
    • At about 2:13am mag 3.6 lambda Geminorum will disappear behind the moon's dark limb 22° from the north cusp. The moon's altitude will be 9° in the west. Calculated using Occult4 for the RFO site. Details will vary as distance from RFO increases.
  • Monday, 3/30/2015 - Occ of Acubens - Time: 03:00
    • At about 3:05am mag 4.3 Acubens (alpha Cancri) will disappear behind the moon's dark limb 89° from the south cusp. The moon's altitude will be 14° in the west. Calculated using Occult4 for the RFO site. Details will vary as distance from RFO increases.
  • Monday, 3/30/2015 - Mn nr Jup - Time: 03:00
    • -
  • Monday, 3/30/2015 - Gan occ Eur - Time: 23:00
    • This is a Jovian mutual satellite event. Ganymede, moving east to west, will just barely occult Europa 11:13pm. The E to W Jovian arrangement just before occultation is:
      Cal - Gan/Eur - Jup - Io
      Begin observing before 11:00pm to watch Ganymede and Europa approach.
  • Tuesday, 3/31/2015 - Gan ecl Eur - Time: 02:00
    • This is a Jovian mutual satellite event. From 2:19 to 2:25am Ganymede, moving east to west, will eclipse Europa. This is a deep penumbral eclipse with maximum dimming of 35% at 2:22.0am. The E to W Jovian arrangement just before eclipse is:
      Eur - Cal - Gan - Jup - Io

April 2015
  • Thursday, 4/2/2015 - Cal occ Gan - Time: 02:30
    • This is a Jovian mutual satellite event. From 2:37 to 3:00am Ganymede, moving east to west, will occult Callisto. This is an annular occultation that almost totally covers the disk of Callisto. The E to W Jovian arrangement just before occultation is:
      Jup - Eur - Cal/Gan
      Note: Io is occulted by Jupiter. Begin observing before 2:40am to watch Ganymede and Callisto approach.
  • Friday, 4/3/2015 - Io ecl Eur - Time: 03:00
    • This is a Jovian mutual satellite event. From 3:07 to 3:12am Io, moving east to west, will eclipse Europa. This is a well centered annular eclipse with maximum dimming of 46% at 3:09.6am. The E to W Jovian arrangement just before eclipse is:
      Jup - Eur - Io - Gan - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on Europa's disk.
  • Saturday, 4/4/2015 - "Pink" Moon - Time: 05:00
    • -
  • Wednesday, 4/8/2015 - Gan occ Cal - Time: 01:00
    • This is a Jovian mutual satellite event. From 1:05 to 1:12am Ganymede, moving east to west, will partially occult Callisto. The E to W Jovian arrangement just before occultation is:
      Eur - Io - Jup - Gan/Cal
      Begin observing by 12:40am to watch Ganymede and Callisto approach.
  • Wednesday, 4/8/2015 - Eur occ Io - Time: 20:30
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 8:52 to 8:56pm. The E to W Jovian arrangement just before occultation is:
      Jup - Eur/Io - Gan
      (Callisto is occulted by Jupiter.) Begin observing by 8:30pm to watch Europa approach Io. Those with larger aperture scopes at high magnification should look for a color difference between the disks.
  • Saturday, 4/11/2015 - Last Qtr - Time: 20:30
    • -
  • Wednesday, 4/15/2015 - Eur occ Io - Time: 23:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 11:04 to 11:07pm. The E to W Jovian arrangement just before occultation is:
      Cal - Jup - Eur/Io - Gan
      Begin observing by 10:40pm to watch Europa approach Io.
  • Saturday, 4/18/2015 - New Moon - Time: 12:00
    • -
  • Saturday, 4/18/2015 - Eur ecl Gan - Time: 21:30
    • This is a Jovian mutual satellite event. From 9:59 to 10:08pm Europa, moving east to west, will eclipse Ganymede. This is an almost perfectly centered annular eclipse with maximum dimming of 44% at 10:03.6pm. However, the umbral shadow is very small. The E to W Jovian arrangement just before eclipse is:
      Gan - Eur - Jup - Io - Cal
      Note: Io's shadow will be in transit of Jupiter during this event, and Io ends transit at 9:31pm. Larger aperture scopes at high magnification should try to view the umbral/penumbral shadow on Ganymede's disk.
  • Monday, 4/20/2015 - Io ecl Eur - Time: 20:30
    • This is a Jovian mutual satellite event. From 8:43 to 8:48pm Io, moving east to west, will eclipse Europa. This is a well centered annular eclipse with maximum dimming of 46% at 8:45.6pm. The E to W Jovian arrangement just before eclipse is:
      Gan - Jup - Eur - Io - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on Europa's disk.
  • Wednesday, 4/22/2015 - Lyrids peak - Time: 17:00
    • Conditions are favorable for viewing the Lyrid meteor shower this year after about 10:30pm on 4/22 and especially in the a.m. hours of 4/23 after the crescent moon has set. Rates of about 15 to 20 per hour are expected.
  • Thursday, 4/23/2015 - Eur occ Io - Time: 01:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 1:16 to 1:20am. The E to W Jovian arrangement just before occultation is:
      Jup - Eur/Io - Gan - Cal
      Begin observing before 1:00am to watch Europa approach Io. Those with large aperture scopes at high magnification should look for a color difference between the disks.
  • Saturday, 4/25/2015 - 1st Qtr - Time: 17:00
    • -
  • Sunday, 4/26/2015 - Eur ecl Gan - Time: 01:00
    • This is a Jovian mutual satellite event. From 1:16 to 1:25am Europa, moving east to west, will eclipse Ganymede. This is an annular eclipse with maximum dimming of 35% at 1:20.5am. However, the umbral shadow is very small. The E to W Jovian arrangement just before eclipse is:
      Gan - Eur - Jup - Io
      (Callisto is eclipsed by Jupiter.) Larger aperture scopes at high magnification should try to view the umbral/penumbral shadow on Ganymede's disk.
  • Monday, 4/27/2015 - Io ecl Eur - Time: 20:30
    • This is a Jovian mutual satellite event. From 10:58 to 11:03pm Io, moving east to west, will partially eclipse Europa. This is nearly an annular eclipse with maximum dimming of 63% at 11:00.7pm. The E to W Jovian arrangement just before eclipse is:
      Cal - Gan - Jup - Eur - Io
      Larger aperture scopes at high magnification should try to view the umbral shadow on Europa's disk.

May 2015
  • Sunday, 5/3/2015 - "Flower" Moon - Time: 20:30
    • -
  • Tuesday, 5/5/2015 - Io ecl Eur - Time: 01:00
    • This is a Jovian mutual satellite event. From 1:13 to 1:19am Io, moving east to west, will partially but substantially eclipse Europa with maximum dimming of 68% at 1:16.2am. The E to W Jovian arrangement just before eclipse is:
      Gan - Jup - Eur - Io - Cal
      Larger aperture scopes at high magnification should try to view the umbral shadow on Europa's disk.
  • Monday, 5/11/2015 - Last Qtr - Time: 03:30
    • -
  • Tuesday, 5/12/2015 - Gan occ Io - Time: 23:00
    • This is a Jovian mutual satellite event. From 11:05 to 11:10pm Ganymede, moving east to west, will partially but substantially occult Io. The E to W Jovian arrangement just before occultation is:
      Eur - Cal - Gan/Io - Jup
      Begin observing by 10:45pm to watch Ganymede and Io approach. Those with larger aperture scopes at high magnification should look for a color contrast between the two satellite disks.
  • Sunday, 5/17/2015 - Eur occ Io - Time: 21:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 9:09 to 9:13pm. The E to W Jovian arrangement just before occultation is:
      Cal - Gan - Jup - Eur/Io
      Begin observing by 8:50pm to watch Europa approach Io. Those with large aperture scopes at high magnification should look for a color difference between the disks.
  • Sunday, 5/17/2015 - New Moon - Time: 21:00
    • -
  • Tuesday, 5/19/2015 - Gan occ Eur - Time: 21:30
    • This is a Jovian mutual satellite event. From 9:33 to 9:40pm Ganymede, moving east to west, will almost totally occult Europa. The E to W Jovian arrangement just before occultation is:
      Cal - Gan/Eur - Jup
      Begin observing by 9:10pm to watch Ganymede and Europa approach. Those with larger aperture scopes at high magnification should look for a color contrast between the two satellite disks. Note: Io is eclipsed by Jupiter and will reappear east of Jupiter at 10:15pm.
  • Sunday, 5/24/2015 - Eur occ Io - Time: 23:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 11:26 to 11:30pm. The E to W Jovian arrangement just before occultation is:
      Gan - Jup - Eur/Io - Cal
      Begin observing by 11:10pm to watch Europa approach Io. Those with large aperture scopes at high magnification should look for a color difference between the disks.
  • Monday, 5/25/2015 - 1st Qtr - Time: 10:30
    • -
  • Friday, 5/29/2015 - Io ecl Eur - Time: 21:00
    • This is a Jovian mutual satellite event. From 9:12 to 9:17pm Io, moving east to west, will partially eclipse Europa with maximum dimming of 40% at 9:14.6pm. The E to W Jovian arrangement just before eclipse is:
      Cal - Jup - Eur - Io - Gan
      Larger aperture scopes at high magnification should try to view the umbral shadow on the north edge of Europa's disk.

June 2015
  • Tuesday, 6/2/2015 - "Strawberry" Moon - Time: 09:30
    • -
  • Friday, 6/5/2015 - Io ecl Eur - Time: 23:00
    • This is a Jovian mutual satellite event. From 11:30 to 11:36pm Io, moving east to west, will partially eclipse Europa with maximum dimming of 37% at 11:32.7pm. The E to W Jovian arrangement just before eclipse is:
      Cal - Jup - Eur - Io - Gan
      Larger aperture scopes at high magnification should try to view the umbral shadow on the north edge of Europa's disk. Note: Jupiter will be 10° high in the west during this event.
  • Tuesday, 6/9/2015 - Last Qtr - Time: 08:30
    • -
  • Wednesday, 6/10/2015 - Gan occ Io - Time: 21:30
    • This is a very challenging Jovian mutual satellite event viewable only by large aperture scopes under good conditions. From 9:56 to 10:18pm Ganymede, moving east to west, will partially but substantially occult Io. Both satellites will be transiting Jupiter near the east limb. The E to W Jovian arrangement just before occultation is:
      Eur - Jup[Io/Gan]Jup - Cal
      Begin observing before 9:30pm to watch the two satellites begin their Jovian transits, Ganymede at 9:34 and Io at 9:46pm.
  • Tuesday, 6/16/2015 - New Moon - Time: 07:00
    • -
  • Wednesday, 6/24/2015 - 1st Qtr - Time: 04:00
    • -
  • Thursday, 6/25/2015 - Eur occ Io - Time: 23:00
    • This is a Jovian mutual satellite event. Europa, moving east to west, will partially occult Io from 9:52 to 9:56pm. The E to W Jovian arrangement just before occultation is:
      Jup - Eur/Io - Gan - Cal
      Begin observing before 9:40pm to watch Europa approach Io. Those with large aperture scopes at high magnification should look for a color difference between the disks. Note: Europa's shadow will be transiting Jupiter.

July 2015
  • Wednesday, 7/1/2015 - "Buck" Moon - Time: 19:30
    • -
  • Sunday, 7/5/2015 - Io occ Gan - Time: 21:00
    • This is a Jovian mutual satellite event. Io, moving east to west, will partially occult Ganymede from 9:18 to 9:20pm. There should be a noticeable color difference between the disks for large aperture scopes at high magnification. The E to W Jovian arrangement just before occultation is:
      Cal - Eur - Jup - Io/Gan
      Begin observing before 9:00pm to watch Io approach Ganymede.
  • Wednesday, 7/8/2015 - Last Qtr - Time: 13:30
    • -
  • Wednesday, 7/15/2015 - New Moon - Time: 18:30
    • -
  • Thursday, 7/23/2015 - 1st Qtr - Time: 21:00
    • -
  • Friday, 7/31/2015 - "Blue" Moon - Time: 03:30
    • -

August 2015
  • Thursday, 8/6/2015 - Last Qtr - Time: 19:00
    • -
  • Wednesday, 8/12/2015 - Perseids peak - Time: 24:00
    • Conditions are very favorable this year for the Perseid meteors. The shower is expected to peak between 11:30pm 8/12 and 2:00am 8/13, though this can vary. Rates of 100 per hour are typical. The Perseids are viewable after about 10pm or so for many days around the peak but the highest rates should be this night.
  • Friday, 8/14/2015 - New Moon - Time: 08:00
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  • Saturday, 8/22/2015 - 1st Qtr - Time: 12:30
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  • Saturday, 8/29/2015 - "Sturgeon" Moon - Time: 11:30
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September 2015
  • Saturday, 9/5/2015 - Last Qtr - Time: 03:00
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  • Saturday, 9/12/2015 - New Moon - Time: 24:00
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  • Monday, 9/21/2015 - 1st Qtr - Time: 02:00
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  • Sunday, 9/27/2015 - "Harvest" Moon - Time: 20:00
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October 2015
  • Sunday, 10/4/2015 - Last Qtr - Time: 14:00
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  • Thursday, 10/8/2015 - Draconids peak - Time: 22:30
    • About 20 meteors per hour are expected around the peak, but outburst have been known to happen. Conditions are favorable all night until after moonrise at 4:12am on 10/9.
  • Monday, 10/12/2015 - New Moon - Time: 17:00
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  • Tuesday, 10/20/2015 - 1st Qtr - Time: 13:30
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  • Wednesday, 10/21/2015 - Orionids peak - Time: 24:00
    • The peak time is uncertain for this meteor shower but the morning of 10/22 after the moon sets at 1:45am is the best time for meteor watching. Rates of about 15 per hour are expected.
  • Tuesday, 10/27/2015 - "Hunter's" Moon - Time: 05:00

November 2015
  • Tuesday, 11/3/2015 - Last Qtr - Time: 04:30
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  • Wednesday, 11/11/2015 - New Moon - Time: 10:00
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  • Tuesday, 11/17/2015 - Leonids peak - Time: 20:00
    • Conditions are very good for Leonid meteor observing this year, though the rate is expected to be on the low side with about 15 to 20 meteors per hour at peak, which is somewhat before local midnight. The meteors are viewable starting around midnight and the morning of 11/18 will be moonless.
  • Wednesday, 11/18/2015 - 1st Qtr - Time: 22:30
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  • Wednesday, 11/25/2015 - "Beaver" Moon - Time: 14:30

December 2015
  • Wednesday, 12/2/2015 - Last Qtr - Time: 23:30
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  • Friday, 12/11/2015 - New Moon - Time: 02:30
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  • Monday, 12/14/2015 - Geminids peak - Time: 10:00
    • This consistently strong shower with about 120 meteors per hour is best viewed on the night of 12/13-14 this year. The shower is viewable all night, which is from about 6:30pm until 6am. The 12/14 10am peak prediction time is uncertain; it could occur any time from 5:30pm on 12/13 to 3pm on 12/14.
  • Friday, 12/18/2015 - 1st Qtr - Time: 07:00
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  • Friday, 12/25/2015 - "Cold" Moon - Time: 03:00
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