This Week's Sky at a Glance
Some daily sky sights for May 18 26
Friday, May 18
Saturday, May 19
See our article, May 20th's Annular Eclipse of the Sun, which has links to more detailed maps, local timetables, and many other resources, including How to Watch Safely. Warning: Looking at any part of the bright Sun without a proper, safe solar filter can permanently damage your vision.
Tuesday, May 22
Wednesday, May 23
Thursday, May 24
Friday, May 25
Saturday, May 26
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).
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 effectively.
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 classic if dated Burnham's Celestial Handbook.
Can a computerized telescope replace charts? I don't think so not for beginners, anyway, and especially not on mounts and tripods that are less than top-quality mechanically (able to point with better than 0.2° repeatability). 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 (magnitude 4.5, in Taurus) is the bright "Evening Star" in the west-northwest in twilight. It's dropping lower every day; see article Venus Takes the Plunge.
Look for Capella 20° to Venus's upper right (not shown here). Look just 2° or 3° to Venus's right or upper right for fainter Beta Tauri.
In a telescope, Venus is a dramatic, thin crescent becoming more interesting all the time. This week it enlarges from 50 to 54 arcseconds tall while waning from 10% to just 4% sunlit. You may even see the crescent with firmly braced binoculars.
Venus is plunging toward inferior conjunction, when it will transit the face of the Sun on June 56 (on the afternoon of the 5th for North America); for details see our article Transit of Venus. This will be the last Venus transit until 2117.
Mars (magnitude +0.3) shines orange under the belly of Leo. It's high in the south-southwest at dusk and lower in the southwest to west later in the evening. Spot Regulus 10° or 12° to Mars's right in twilight, and to its lower right later. They're moving farther apart daily. Fainter Gamma Leonis is 8° above Regulus; the three form a triangle. Mars in a telescope is gibbous and very small (about 8.5 arcseconds wide), fading and shrinking.
Jupiter is buried deep in the glow of sunrise.
Saturn (magnitude +0.3, in Virgo) shines high in the south after dark. Spica, fainter and bluer, is nearly 5° to Saturn's lower right early in the evening, and directly below it later.
Uranus (magnitude 5.9, at the Pisces-Cetus border) is very low in early dawn.
Neptune (magnitude 7.9, in Aquarius) is low in the east-southeast before dawn's first light.
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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