This Week's Sky at a Glance
Some night sky sights for September 13 21
Saturday, September 14
Sunday, September 15
Monday, September 16
Tuesday, September 17
Wednesday, September 18
Thursday, September 19
Friday, September 20
Saturday, September 21
Want to become a better amateur astronomer? Learn your way around the constellations. They're the key to locating everything fainter and deeper to hunt with binoculars or a telescope.
This is an outdoor nature hobby. For an easy-to-use constellation guide covering the whole evening sky, use the big monthly map in the center of each issue of Sky & Telescope, the essential guide to astronomy. Or download our free Getting Started in Astronomy booklet (which only has bimonthly maps).
Pocket Sky Atlas, which shows stars to magnitude 7.6; the larger and deeper Sky Atlas 2000.0 (stars to magnitude 8.5); and the even larger Uranometria 2000.0 (stars to magnitude 9.75). And read how to use sky charts with a telescope.
You'll also want a good deep-sky guidebook, such as Sue French's Deep-Sky Wonders collection (which includes its own charts), Sky Atlas 2000.0 Companion by Strong and Sinnott, the bigger Night Sky Observer's Guide by Kepple and Sanner, or the beloved if dated Burnham's Celestial Handbook.
Can a computerized telescope replace charts? Not for beginners, I don't think, and not on mounts and tripods that are less than top-quality mechanically (able to point with better than 0.2° repeatability, which means heavy and expensive). As Terence Dickinson and Alan Dyer say in their invaluable Backyard Astronomer's Guide, "A full appreciation of the universe cannot come without developing the skills to find things in the sky and understanding how the sky works. This knowledge comes only by spending time under the stars with star maps in hand."
This Week's Planet Roundup
Venus and Saturn (magnitudes –4.1 and +0.7, respectively) are low in the west-southwest in evening twilight, far lower left of Arcturus. They set right after dusk.
Venus is the brightest but lowest. Saturn slides from Venus's upper left at the beginning of the week to its right or upper right by week's end.
Mars (magnitude 1.6) rises around 3 a.m. and glows due east in dim Cancer as dawn begins. Look for it far lower left of bright Jupiter. In a telescope Mars is still an extremely tiny 4.3 arcseconds wide.
Jupiter (magnitude –2.1, in Gemini) rises around 1 a.m. and blazes high in the east-southeast by dawn. To its left are Castor and Pollux.
Uranus (magnitude 5.7, in Pisces) and Neptune (magnitude 7.8, in Aquarius) are well up toward the southeast by 10 p.m. Finder charts for Uranus and Neptune.
All descriptions that relate to your horizon including the words up, down, right, and left are written for the world's mid-northern latitudes. Descriptions that also depend on longitude (mainly Moon positions) are for North America. Eastern Daylight Time (EDT) equals Universal Time (also known as UT, UTC, or GMT) minus 4 hours.
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