Here are the astronomical events occurring in the month of September: (All times are given in UTC format)
- September 5: Venus passes 0.7 degrees from Regulus.
- September 9: The last supermoon of the year will occur that day at 1:39 UTC, 22 hours after passing its perigee.
- September 15: Comet C/2013 V5 Oukaimeden might reach 5.5 magnitude for observers in the southern hemisphere.
- September 20: Mercury will pass 0.5 degrees south of Spica at 21:00 UTC.
- September 21: Mercury will reach its greatest elongation, being 26.4 degrees east of the Sun. It will shine at Magnitude 0, in the dawn sky. The best view of this will be for southern hemisphere observers.
- September 23: The Autumnal Equinox will occur at 2:29 UTC. At this point, the Northern and Southern hemispheres will have exactly 12 hours in their day. Here is a video that shows the Earth through one year. http://youtu.be/FmCJqykN2J0
- September 23: GEO Satellites eclipse seasons occur. This is when the Geosynchronous Satellites will enter the Earth’s shadow and, just like a lunar eclipse, becomes darkened for a few minutes.
- September 28: The Moon will occult Saturn at approximately 4:25 UTC. The Moon will also occult minor planets 1 Ceres and 4 Vesta at the same day.
Enjoy and Happy Observing!