It’s September and a wonderful time to enjoy the night sky. In northern latitudes, the length of night is generally outpacing the upcoming winter chill. Spring and Fall are great times to become reacquainted with the cosmos.
Here’s a brief run-down of what to expect in the September skies (note: this information is tailored to those of us in the Northern Hemisphere).
What’s that planet?:
If it’s in the evening, it’s most likely Jupiter. If it’s in the morning, you might be seeing Venus, Mercury or Mars.
This month, Jupiter is its bold, bright self, but it’s tracking fairly close to the Sun and setting in the southwest. You’ll see it shortly after sundown, earlier and earlier the further north you are. In October, Jupiter will be outside of our view until its return in November. On September 21 and 22, Jupiter will appear very near to a thin crescent Moon. Saturn is also up during September nights, though you’ll want to consult a star chart or skymap app to find it due to it being hard to distinguish from stars. Speaking of Saturn, September 15 marks the grand finale of the Cassini spacecraft. After 20 years of astonishing service, Cassini will plunge into Saturn’s atmosphere and end one of the most successful space missions imagined.
On September mornings, keep an eye out for Venus, Mars, and Mercury. Venus is hard to miss, it’s the brightest object in the sky following the Sun and Moon. Keep an eye to the east about two hours before sunrise (closer to sunrise the later we get into the month) for our bright sister planet.
If you’re fortunate enough to live on the mid-northern latitudes, you might get to witness a fantastic conjunction of Mercury and Mars. (If you’re as far north as Alaska, you’ll need a clear view of the horizon.) On September 16, Mercury and Mars appearing extremely close to each other in the morning sky. Use this website to get a custom report for your viewing location.
If you need help finding out when a planet rises and sets for your location, this website is fairly indispensable.