Some daily sky sights among the ever-changing Moon, planets, and stars.

Comet Lovejoy is back in moonless evening view for binoculars and telescopes, high in the northern sky. See Comet Lovejoy Shines On.

Friday, February 6

Jupiter is at opposition tonight: opposite the Sun as seen from Earth. So it rises around sunset, shines highest in the south around midnight, and sets at sunrise. Jupiter now appears 45 arcseconds wide, its biggest for this year. It remains essentially this large in your telescope all February. See our article The King Holds Court — Jupiter at Opposition.

Look west-southwest in twilight to watch Venus and Mars closing in on each other for the next two weeks. The visibility of faint Mars in bright twilight is exaggerated here. The blue 10° scale is about the width of your fist held at arm's length, an always-handy measuring device.

Saturday, February 7

Have you been keeping an eye on bright Venus and faint little Mars at dusk? Watch as they move nearer each other every day. They'll reach conjunction, just 0.4° apart, on the 21st.

Sunday, February 8

Orion stands high in the southeast after dusk, with his three-star belt pointing down toward brilliant Sirius, the Dog Star. The bright trio of Sirius, Betelgeuse (high above, in Orion's shoulder), and Procyon (to their left) form the big, equilateral Winter Triangle. Compared to the Summer Triangle, it's brighter, more nicely shaped, and more colorful.

Monday, February 9

The Winter Triangle, or rather one side of it, is also part of a much bigger asterism: the Winter Hexagon. This fills the sky toward the east and south these evenings. Start with brilliant Sirius at its bottom. Going clockwise from there, march through Procyon, Pollux and Castor, Capella very high, Aldebaran over to Capella's right, down to Rigel in Orion's foot, and back to Sirius.

Tuesday, February 10

On one of these dark, moonless evenings, take Steve Gottlieb's "Best in Show" tour of four fine planetary nebulae in the February sky — using the article, charts, and pictures in the February Sky & Telescope, page 59. Bundle up for a deep-sky adventure!

Wednesday, February 11

In early dawn on Thursday morning the 12th, the last-quarter Moon guides the way to Saturn and Antares to the Moon's lower left, as shown below:

If you're awake for these frigid dawns, watch the waning Moon walking above "summer" constellations now making their morning appearance.
If you're awake for these frigid dawns, watch the waning Moon walking above "summer" constellations now making their morning appearance.

This is a fine time of year to look for the zodiacal light at nightfall, if you live in the mid-northern latitudes. From a clear, clean, dark site, look west at the end of twilight for a vague but huge, tall pyramid of pearly light. It's tilted left to align along the constellations of the zodiac. What you're seeing is sunlit interplanetary dust orbiting the Sun near the ecliptic plane. Article: How to See and Shoot the Zodiacal Light.

Believe it or not, seen from interstellar distances this would be the solar system's brightest feature in total after the Sun itself. The "zodiacal lights" of dust around other stars may be a serious obstacle to someday seeing their small, terrestrial planets.

Thursday, February 12

In early dawn on Friday morning the 13th, the waning Moon forms a nice triangle with Saturn to its right and Antares below them, as shown above.

Friday, February 13

After dusk at this time of year, four carnivore constellations climb low in a row across the northeast to southeast. They're all seen in profile, with their noses pointed to the upper right and their feet (if any) to the right: Ursa Major in the northeast (with the Big Dipper as its brightest part), Leo in the east, Hydra the Sea Serpent in the southeast (Jupiter shines midway between the heads of Leo and Hydra), and Canis Major in the south.

Saturday, February 14

Zenith star. If you're in the world's mid-northern latitudes, bright Capella passes straight overhead, or nearly so, around 7 or 8 p.m. (depending on how far west or east you are in your time zone). It goes exactly through your zenith if you're at latitude 46° north: for example Portland, Oregon; Montreal; central France.

And whenever Capella passes highest, Rigel in Orion's foot is always due south.

Want to become a better 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
The Pocket Sky Atlas plots 30,796 stars to magnitude 7.6 — which may sound like a lot, but it's still less than one per square degree on the sky. Also plotted are many hundreds of telescopic galaxies, star clusters, and nebulae.

Once you get a telescope, to put it to good use you'll need a detailed, large-scale sky atlas (set of charts). The standards are the little Pocket Sky Atlas, which shows stars to magnitude 7.6; the larger and deeper Sky Atlas 2000.0 (stars to magnitude 8.5); and once you know your way around, 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 fairly heavy and expensive). 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

Jupiter, Io, and its shadow on Feb. 5, 2015, one day before opposition
Io partially covered its shadow as they crossed Jupiter's face together on February 5th, just 27 hours before Jupiter's opposition. South here is up. Image by Christopher Go in the Philippines.

Mercury is deep in the glow of sunrise.

Venus (magnitude –3.9) and Mars (less than 1% as bright at magnitude +1.2) pose in the west-southwest during evening twilight. They're near the border of Pisces and Aquarius. The gap between them diminishes this week from 7° to 4°. They're heading for a close conjunction, 0.4° apart, on February 21st.

Jupiter (magnitude –2.6, at the Leo-Cancer border) is at opposition on February 6th. It comes into view low in the east-northeast as twilight fades, and by 8 p.m. it's high enough in the east for good telescopic viewing. Look to its left and lower left for the Sickle of Leo. Jupiter shines highest in the south in the middle of the night. Bundle up!

Saturn (magnitude +0.5, at the head of Scorpius) rises around 2 a.m. and is well placed in the south as dawn begins. Look 1° lower right of it for Beta Scorpii, magnitude 2.5, a showpiece double star for telescopes. Below them by 9° is orange Antares.

Uranus (magnitude 5.8, in Pisces) is still in the west-southwest right after dusk.

Neptune is lost in the sunset.


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 Standard Time (EST) is Universal Time (UT, UTC, or GMT) minus 5 hours.

“This adventure is made possible by generations of searchers strictly adhering to a simple set of rules. Test ideas by experiments and observations. Build on those ideas that pass the test. Reject the ones that fail. Follow the evidence wherever it leads, and question everything. Accept these terms, and the cosmos is yours.”

— Neil deGrasse Tyson, 2014.


Image of Jack-Barnes


February 12, 2015 at 1:52 pm

How do I put in my local co-ordinates?

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Image of Jason


February 13, 2015 at 2:02 am

If you are referring to the interactive sky chart, make sure pop ups are enabled. You'll need to go into your web browser's options to do this. Once pop ups are enabled, click the change button to the right of the location tab. You should then get a box asking to enter your location data.

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