Friday, August 12
Saturday, August 13
Sunday, August 14
Monday, August 15
Tuesday, August 16
Wednesday, August 17
Thursday, August 18
Friday, August 19
Saturday, August 20
Ceres, a future destination for Dawn (it'll get there in February 2015), lurks two constellations farther to the east in Cetus. It's currently magnitude 8.0.
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.
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 magazine of astronomy. Or download our free Getting Started in Astronomy booklet (which only has bimonthly maps).
Once you get a telescope, to put it to good use you must have a detailed, large-scale sky atlas (set of charts). The standards are the Pocket Sky Atlas, which shows stars to magnitude 7.6; the larger Sky Atlas 2000.0 (stars to magnitude 8.5); and the even larger and deeper Uranometria 2000.0 (stars to magnitude 9.75). And read how to use sky charts effectively.
You'll also want a good deep-sky guidebook, such as Sky Atlas 2000.0 Companion by Strong and Sinnott, or the more detailed and descriptive Night Sky Observer's Guide by Kepple and Sanner, or the classic if dated Burnham's Celestial Handbook.
Can a computerized telescope take their place? I don't think so — not for beginners, anyway, and especially not on mounts that are less than top-quality mechanically. As Terence Dickinson and Alan Dyer say in their 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
Mercury and Venus are hidden in the glare of the Sun.
Mars (magnitude +1.4, in the feet of Gemini) rises around 2 or 3 a.m. daylight-saving time. By dawn it's in good view in the east. It's the "star" far lower right of Capella, far lower left of Aldebaran, and less far left of similarly-colored Betelgeuse. In a telescope, Mars is still just a very tiny blob 4.5 arcseconds in diameter.
Jupiter (magnitude –2.5, in southern Aries) rises in the east-northeast around 11 or midnight daylight saving time. Look above it for the little star pattern of Aries and (once Jupiter is well up) closer below it for the head of Cetus, rather dim. By early dawn Jupiter shines very high in the southeast to south, making this the best time to examine it with a telescope.
Saturn (magnitude +0.9, in Virgo) is sinking ever lower in the west-southwest at dusk. Look far below high, bright Arcturus. Left of Saturn by 11° is Spica. Right or lower right of Saturn by 3° is fainter Gamma Virginis (binoculars will help).
Uranus (magnitude 5.8, in western Pisces) and Neptune (magnitude 7.8, in western Aquarius) are well up in the east or southeast before midnight. Here's our printable finder chart for both.
Pluto (magnitude 14.0, in northern Sagittarius) is highest in the south right after dark. A big finder chart for it is in the July Sky & Telescope, page 64.
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.
To be sure to get the current Sky at a Glance, bookmark this URL:
If pictures fail to load, refresh the page. If they still fail to load, change the 1 at the end of the URL to any other character and try again.