The Planets in September
Mercury – This month the planet will be too close to the setting sun to be observable.
Venus- Venus will be a little more visible than Mercury and close to the thin waxing crescent moon on September 10. Still in the glow of the setting sun, both objects will be difficult to see.
Mars – Mars is now lost in the sun’s glow and unobservable in September.
Jupiter- Jupiter is low in the sky at sunset, but it still dominates the evening sky. On September 17-18, it will be close to the bright moon.
Saturn- Like Jupiter, this month Saturn is bright and well placed in the sky after sunset. On September 16-17, the planet will be close to the moon like Jupiter.
Uranus- In September, Uranus is visible to the naked eye if observed from a location with a clear, dark sky. The planet is well placed in the morning sky in the constellation Aries. (Refer to the finder chart which below.) With a pair of binoculars, locate the Pleiades cluster in the constellation Taurus in the eastern sky. Then move down a little and back to the west, this is Aries. Scan the area until you locate a tiny, bluish disk. This is Uranus.
Neptune- Neptune is now observable by binoculars, but a telescope provides a much better view. The planet will reach its closest approach to Earth on September 14 and is visible all night. To find it, refer to the finder chart. First locate Saturn, then move east to Jupiter. Continue moving east a little more than the distance between Jupiter and Saturn to find Neptune. It will appear as a tiny, faint, deep blue disk when using a telescope’s high power eyepiece.