This Week's Sky at a Glance
Some daily sky sights for May 4 12
Saturday, May 5
Sunday, May 6
Although they look close together, they're not. Venus is 3 light-minutes from us; Beta Tauri is 130 light-years in the background.
Monday, May 7
Tuesday, May 8
Wednesday, May 9
Thursday, May 10
Friday, May 11
Saturday, May 12
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
Mercury is lost deep in the glow of sunrise.
Venus (magnitude 4.7, in Taurus) is the blazing "Evening Star" high in the west in twilight, and lower later in the evening. It's still as bright as it ever gets, but it's beginning its rapid May descent toward the sunset. See article, Venus Takes the Plunge.
Look high to Venus's upper right for Capella. Look very close to the bright planet for Beta Tauri, also known as El Nath, glimmering only 1/300 as bright (at magnitude +1.6). Beta Tauri is 1° above Venus on May 4th, 0.8° to Venus's upper right when they're closest together on the 6th, and 1.6° to the planet's right by May 11th.
You can see Venus through the clear blue sky of day if your eye lands right on it. Look for it 35° (three or four fist-widths at arm's length) to the celestial east of the Sun.
The best time to examine Venus in a telescope is late afternoon or around sundown. It's now a crescent about 42 arcseconds tall and 20% sunlit, waning and enlarging daily. Venus will transit the face of the Sun on June 56 (on the afternoon of the 5th for North America); see our article in the June Sky & Telescope, page 50, or online. This is the last transit of Venus until 2117.
Mars (magnitude +0.1) shines fire-orange in Leo. It's high in the south-southwest at dusk and lower in the southwest to west later in the evening.
Regulus is about 7° Mars's right or lower right and moving farther from it daily. Fainter Gamma Leonis is 8° above Regulus.
Mars in a telescope is gibbous and small, about 9.5 arcseconds wide, fading and shrinking each week.
Jupiter is lost in the glare of the Sun.
Saturn (magnitude +0.4, in Virgo) shines in the southeast in twilight and highest in the south around 11 or midnight daylight saving time. The star 5° to Saturn's lower right in the evening is Spica, slightly fainter and bluer.
Uranus is very low in the 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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