A table listing some of the Astronomical Phenomena for September 2017:

Phenomena September

DayEvent
2Mercury mag. +2.3 passes 4 degrees south of Mars mag. +1.8 (0 UT)
4Mercury mag. +1.9 is stationary in Leo, afterwards resumes direct motion (16 UT)
5Mars mag. +1.8 passes 0.7 degrees north of Regulus mag. +1.4 (2 UT)
5Neptune mag. +7.8 is at opposition in Aquarius approx. 28.939 AU (4,329 million km or 2,690 million miles) from Earth (5 UT)
5Jupiter mag. -1.7 passes 3 degrees north of Spica mag. +1.0 (11 UT)
6Moon passes 0.8 degrees south of Neptune mag. +7.8 (5 UT)
6Full Moon (7:03 UT)
6Asteroid (89) Julia mag. +9.0 is at opposition in Pegasus
9Moon passes 4 degrees south of Uranus mag. +5.7 (10 UT)
10Mercury mag. 0.0 passes 0.6 degrees south of Regulus mag. +1.4 (12 UT)
12Mercury mag. -0.4 is at greatest elongation west 17.9 degrees (10 UT)
12Moon passes 0.4 degrees north of Aldebaran mag. +0.9, occultation is visible from western USA, Hawaii (12:35 UT)
13Last quarter Moon (6:25 UT)
13Moon is at perigee 369,855 km or 229,817 miles from Earth (16:05 UT)
15Mercury is at perihelion 0.307 AU (approx. 45.9 million kms or 28.5 million miles) from the Sun (13 UT)
15Moon passes 9 degrees south of Pollux mag. +1.1 (17 UT)
16Mercury mag. -0.8 passes 0.1 degrees north of Mars mag. +1.8 (18 UT)
18Moon passes 0.5 degrees south of Venus mag. -3.9, daytime occultation (0:56 UT)
18Moon passes 0.1 degrees north of Regulus mag. +1.4, daytime occultation (4:57 UT)
18Moon passes 0.1 degrees north of Mars mag. +1.8, daytime occultation (19:43 UT)
18Moon passes 0.1 degrees south of Mercury mag. -0.9, daytime occultation (23:22 UT)
19Venus passes 0.5 degrees north of Regulus mag. +1.4 (23 UT)
20New Moon (5:30 UT)
22Moon passes 7 degrees north of Spica mag. +1.0 (2 UT)
22Moon passes 4 degrees north of Jupiter mag. -1.7 (8 UT)
22Equinox (20:02 UT)
25Moon passes 10 degrees north of Antares mag. +1.0 (21 UT)
27Moon passes 4 degrees north of Saturn mag. +0.5 (0 UT)
27Moon is at apogee 404,341 km or 251,246 miles from Earth (6:51 UT)
28First quarter Moon (2:54 UT)

Sky Highlights - September 2017

Opposition
Neptune reaches opposition on September 5th

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for September

Northern Hemisphere
Evening
West:- Jupiter (mag. -1.7)
Southwest:- Saturn (mag. +0.5)
East:- Neptune (mag. +7.8)
Midnight
South:- Neptune
East:- Uranus (mag. +5.7)
Morning
West:- Neptune
South:- Uranus
East:- Venus (mag. -3.9), Mars (mag. +1.8) (from second week), Mercury (mag. +0.5 to -1.3) (from second week)

Southern Hemisphere
Evening
West:- Jupiter
Northwest:- Saturn
East:- Neptune
Midnight
West:- Saturn
North:- Neptune
Northeast:- Uranus
Morning
West:- Neptune
Northwest:- Uranus
Northeast:- Venus
East:- Mars (end of month)

Deep Sky

Small telescopes:-
Messier 13 - M13 - Great Hercules Globular Cluster
Messier 92 - M92 - Globular Cluster
Messier 11 - M11 - The Wild Duck Cluster (Open Cluster)
Messier 7 - M7 - The Ptolemy Cluster (Open Cluster)
Messier 6 - M6 - The Butterfly Cluster (Open Cluster)
Messier 4 - M4 - Globular Cluster
Messier 8 - M8 - Lagoon Nebula (Emission Nebula)
Messier 16 - M16 - Eagle Nebula (Emission Nebula with Open Cluster)
Messier 20 - M20 - Trifid Nebula (Emission and Reflection Nebula)

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