05- The Eta Aquarid meteors peak (time variable), with an estimated ZHR of 55.
07- Mercury reaches greatest evening elongation at 21.2 degrees east of the Sun at 4:00 UT.
19- The Moon occults Aldebaran for northern North America at ~2:53 UT .
20- Comet C/2014 Q1 PanSTARRS may reach binocular visibility.
21- Io and Ganymede both cast shadows on Jupiter from 00:04 to 00:33 UT.
21- Callisto and Europa both cast shadows on Jupiter from 13:26 to 13:59 UT.
23- Saturn reaches opposition at ~1:00 UT.
24- Asteroid 1669 Dagmar occults the +1st magnitude star Regulus at ~16:47 UT for the Arabian peninsula, the brightest star occulted by an asteroid for 2015.
28- Ganymede and Io both cast shadows on Jupiter from 02:01 to 04:18 UT.
30- Comet 19P/Borrelly may reach binocular visibility.
01- The International Space Station reaches full illumination as the June solstice nears, resulting in multiple nightly passes favoring northern hemisphere observers.
04- Io and Ganymede both cast shadows on Jupiter from 4:54 to 6:13 UT.
05- Venus reaches greatest eastern (dusk) elongation for 2015, 45 degrees from the Sun at 16:00 UT.
10- Asteroid 424 Gratia occults a +6.1 magnitude star at ~15:10 UT for northwestern Australia.
15- The Moon occults Mercury for the South Indian Ocean at ~2:26 UT.
15- Moon occults Aldebaran in the daytime for the high Arctic at ~11:33 UT.
16- Comet C/2014 Q1 PanSTARRS may reach naked eye visibility.
21- The June northward solstice occurs at 10:51 UT.
24- Mercury reaches greatest (morning) elongation at 22.5 degrees west of the Sun at 17:00 UT.
01- Venus passes 0.4 degrees from Jupiter at 9:00 UT, marking the closest conjunction of two naked eye planets for 2015.
02- Comet C/2013 US10 Catalina may reach binocular visibility.
06- Earth reaches aphelion at 13:00 UT.
06- Pluto reaches opposition at 15:00 UT, just a week prior to New Horizons’ historic flyby of the distant world.
12- The Moon occults Aldebaran for northeastern Asia ~18:17 UT.
19- The Moon occults Venus for the South Pacific at ~1:07 UT.
25- Asteroid 49 Pales occults a +6.6 magnitude star at 10:55 UT for Mexico.
28- The Delta Aquarids peak (time variable) with a predicted ZHR of 16.
31- A “Blue Moon” occurs, in the sense of the second Full Moon in a given month.
07- Mercury, Jupiter and Regulus pass within a degree of each other over the next few mornings.
08- The Moon occults Aldebaran for central Asia at ~23:45 UT.
13- The Perseid meteors peak from 06:30 to 09:00 UT, with a maximum predicted ZHR of 100 favoring North America.
19- Mars crosses the Beehive Cluster M44.
28- Asteroid 16 Psyche occults a +6.4 magnitude star at ~9:49 UT for Bolivia and Peru.
29- Supermoon 1 of 3 for 2015: The Moon reaches Full at 18:38 UT, 20 hours from perigee.
01- Neptune reaches opposition at ~3:00 UT.
03- Asteroid 112 Iphigenia occults a +3rd magnitude star for Mexico and Miami at ~9:20 UT. This is the brightest star occulted by an asteroid in 2015 for North America.
02- Geostationary satellite and SDO eclipse season begins as we approach the September equinox.
04- Mercury reaches its greatest elongation for 2015, at 27 degrees east of the Sun at 8:00 UT in the dusk skies.
05- The Moon occults Aldebaran for northeastern North America at ~5:38 UT.
13- “Shallow point” (also known as the minor lunar standstill) occurs over the next lunation, as the Moon’s orbit reaches a shallow minimum of 18.1 degrees inclination with respect to the celestial equator… the path of the Moon now begins to widen towards 2025.
13- A partial solar eclipse occurs, centered on 6:55 UT crossing Africa and the Indian Ocean.
23- The September southward equinox occurs at 2:29 UT.
25- Mars passes 0.8 degrees from Regulus at ~4:00 UT.
28- A total lunar eclipse occurs centered on 2:48 UT, visible from the Pacific, the Americas and eastern Europe.
28- Supermoon 2 of 3 for 2015: The Moon reaches Full at 2:52 UT, approximately an hour from perigee. This marks the closest Full Moon of the year.
01- Comet C/2013 US10 Catalina may reach naked eye visibility.
02- The Moon occults Aldebaran for the northern Pacific at 13:14 UT.
02- Io and Callisto both cast shadows on Jupiter from 12:26 to 13:35 UT.
08- The Moon occults Venus for Australia at ~20:32 UT.
11- The Moon occults Mercury for Chile at ~12:00 UT.
12- Uranus reaches opposition at ~3:00 UT.
16- Mercury reaches greatest elongation (morning) 18.1 degrees west of the Sun at 10:00 UT.
17- Mars passes 0.4 degrees from Jupiter at 22:00 UT.
18- Io and Ganymede both cast shadows on Jupiter from 10:45 to 12:10 UT.
21- The Orionid meteors peak (time variable) with a projected ZHR of 15.
25- Venus passes 1 degree from Jupiter ~19:00 UT.
25- Io and Ganymede both cast shadows on Jupiter from 12:37 to 14:51 UT.
27- Supermoon 3 of 3 for 2015: The Moon reaches Full at 12:06 UT, 23 hours from perigee.
29- The Moon occults Aldebaran for Europe at ~23:07 UT.
01- Io and Ganymede both cast shadows on Jupiter from 17:36 to 17:47 UT.
02- Venus passes 0.7 degrees south of Mars at 00:30 UT.
12- Will the 7 year “Taurid fireball meteor shower” produce?
18- The Leonid meteor shower peaks at 04:00 UT, with an estimated ZHR of 15 favoring Europe.
22- Are we in for a once per decade Alpha Monocerotids outburst? The 2015 peak arrives at 4:25 UT, favoring Europe… with a max ZHR = 400+ possible.
26- The Moon occults Aldebaran for North America at ~9:56 UT.
29- Comet C/2013 X1 PanSTARRS may reach binocular visibility.
01- The International Space Station reaches full illumination as the December solstice nears, resulting in multiple nightly passes favoring the southern hemisphere.
04- Mercury occults the +3.3 magnitude star Theta Ophiuchi for South Africa at 16:16 UT prior to dusk.
06- The Moon occults Mars for central Africa at ~2:42 UT.
07- The Moon occults Venus in the daytime for North America at ~16:55 UT.
14- The Geminid meteor shower peaks at 18:00 UT, with a ZHR=120 favoring NE Asia.
21- The December southward solstice occurs at 23:03 UT.
23- The Ursid meteor shower peaks at 2:30 UT with a ZHR variable from 10-50 favoring Europe and the Middle East.
23- The Moon occults Aldebaran for Europe and central Asia at ~19:32 UT.
29- Mercury reaches greatest evening elongation at 19.7 degrees east of the Sun at 00:01 UT.