Home / Space force / This Week’s Sky at a Glance, December 6 – 14 – Sky & Telescope

This Week’s Sky at a Glance, December 6 – 14 – Sky & Telescope

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Venus, Saturn and Jupiter at dusk, Dec. 6, 2019

Jupiter is disappearing deep into the sundown, whereas Venus, having ditched Jupiter, is on its strategy to flirt with Saturn. The blue 10° scale is concerning the width of your fist at arm’s size.

Friday, Dec. 6

• The Moon shines decrease left of the Nice Sq. of Pegasus.

Gulf Coast asteroid occultation tonight. David Dunham of the Worldwide Occultation Timing Affiliation (IOTA) writes, “One of many brighter asteroidal occultations of the yr will happen simply earlier than 11 p.m. CST throughout southern Texas, simply south of New Orleans, and over Jacksonville, Florida. This would be the occultation of 6.5-magnitude 18 Aurigae by the 72-km asteroid 55 Pandora. Clear skies are predicted for southern Texas, and it could be clear sufficient to watch it from Jacksonville as nicely.” Additional particulars might be discovered on IOTA’s webpage.

Saturday, Dec. 7

• Vega remains to be the brightest star within the west-northwest in early night. The brightest over it’s Deneb. Farther to Vega’s left is Altair, halfway in brightness between Vega and Deneb.

These three kind the Summer season Triangle, and when the Summer season Triangle finds itself right here, you possibly can search for the Nice Sq. of Pegasus crossing the meridian excessive within the south.

Earliest sundown of the yr, if you happen to dwell close to latitude 40° north. Despite the fact that we’re nonetheless two weeks from the winter solstice.

This offset of the earliest sundown from the solstice date is balanced out by the alternative taking place at dawn: The Solar would not come up its newest till January 4th. Why? Blame the tilt of Earth’s axis and the eccentricity of Earth’s orbit.

Sunday, Dec. eight

• Orion totally clears the japanese horizon by 7 or eight p.m. now, relying on how far east or west you reside in your time zone. Excessive above Orion shines orange Aldebaran. Above Aldebaran is the little Pleiades cluster, the dimensions of your fingertip at arm’s size.

Far left of Aldebaran and the Pleiades shines shiny Capella.

Down under Orion, sensible Sirius now rises round eight or 9.

Monday, Dec. 9

• Presently of yr the Large Dipper lies down lowest quickly after darkish, due north. It is solely under the north horizon if you happen to’re as far south as Miami.

However by midnight, the Dipper stands straight up on its deal with in high quality view excessive within the northeast!

Tuesday, Dec. 10

• Venus and Saturn are slightly below 2° aside in late twilight this night and tomorrow night. Look relatively low within the southwest. Though they seem shut collectively, Saturn is definitely eight instances farther away. And it is 10 instances bigger in diameter, although it is a lot much less brightly lit by the distant Solar.

Wednesday, Dec. 11

• Full Moon tonight (actual at 12:15 a.m. EST), shining in japanese Taurus. Within the night search for orange Aldebaran to the Moon’s proper, the Pleiades peeking by the moonlight above Aldebaran, and brighter Capella farther to the Moon’s higher left. Betelgeuse, in Orion’s shoulder, is down under.

By midnight the Moon may be very excessive within the south, not removed from the zenith. The complete Moon of the Christmas season rides larger throughout the sky at midnight than the total Moon in another season, thus “giving lustre of noon to things under.”

• Simply earlier than the start of daybreak Thursday morning, discover Mars, a mere magnitude 1.7, low within the southeast. It is only one/four° or much less from Alpha Librae (Zubenelgenubi), which isn’t that a lot fainter at magnitude 2.eight. Binoculars can present that Alpha Librae is a large double star: the secondary, magnitude 5.1, glimmers 1/15° above the first.

Thursday, Dec. 12

• The Summer season Triangle is sinking decrease within the west, and Altair is the primary of its stars to go (for mid-northern skywatchers). Begin by recognizing shiny Vega, magnitude zero, within the northwest proper after darkish. The brightest star above Vega is Deneb. Altair, the Triangle’s third star, is farther to Vega’s left or decrease left. How late into the night time, and into the advancing season, can you retain Altair in view?

Venus and Saturn at dusk, Dec. 13, 2019

Now Saturn is pulling away from Venus, on its strategy to disappearing into the sundown by yr’s finish.

Friday, Dec. 13

• The Geminid Meteor bathe, normally probably the greatest of the yr, ought to be at its peak late tonight and tomorrow night time. However the waning gibbous Moon will mild the sky, so solely the brightest few meteors will shine by. You may see one each a number of minutes on common from midnight to daybreak, if in case you have a wide-open view of the sky overhead and defend the glary Moon out of your eyes.

In early night the meteors will likely be a lot fewer, however the Moon will likely be decrease — and the Geminids that do seem will likely be lengthy Earth-grazers skimming far throughout the highest of the ambiance.

Saturday, Dec. 14

• The waning gibbous Moon, in Gemini, rises after dinnertime under Pollux and Castor. To the decrease proper of the Moon, Procyon is quickly on the rise. Off to the suitable of Gemini sparkles Orion.

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Need to grow to be a greater astronomer? Be taught your means across the constellations. They’re the important thing to finding every part fainter and deeper to hunt with binoculars or a telescope.

That is an outside nature interest. For an easy-to-use constellation information overlaying the entire night sky, use the massive month-to-month map within the heart of every problem of Sky & Telescope, the important information to astronomy.

Jumbo Pocket Sky Atlas cover

The Pocket Sky Atlas plots 30,796 stars to magnitude 7.6, and a whole lot of telescopic galaxies, star clusters, and nebulae amongst them. Proven above is the Jumbo Edition for simpler studying within the night time. Sample chart.

When you get a telescope, to place it to good use you will want an in depth, large-scale sky atlas (set of charts). The essential normal is the Pocket Sky Atlas (in both the original or Jumbo Edition), which reveals stars to magnitude 7.6.

Subsequent up is the bigger and deeper Sky Atlas 2000.0, plotting stars to magnitude eight.5; almost thrice as many. The subsequent up, as soon as you recognize your means round, are the even bigger Interstellarum atlas (stars to magnitude 9.5) and Uranometria 2000.0 (stars to magnitude 9.75). And browse how to use sky charts with a telescope.

You may additionally need a good deep-sky guidebook, reminiscent of Sue French’s Deep-Sky Wonders assortment (which incorporates its personal charts), Sky Atlas 2000.0 Companion by Robust and Sinnott, or the larger Night Sky Observer’s Guide by Kepple and Sanner.

Can a computerized telescope substitute charts? Not for learners, I do not assume, and never on mounts and tripods which might be lower than top-quality mechanically (that means actually heavy and costly). And as Terence Dickinson and Alan Dyer say of their Backyard Astronomer’s Guide, “A full appreciation of the universe can’t come with out growing the abilities to search out issues within the sky and understanding how the sky works. This information comes solely by spending time underneath the celebrities with star maps in hand.”


This Week’s Planet Roundup

Mercury and Mars at dawn, Dec. 7, 2019

Two planets at daybreak. Because the week progresses, Mercury strikes all the way down to the decrease left whereas Mars works it means a bit larger towards the higher proper.

Mercury, magnitude –zero.6 all week, regularly strikes decrease in early daybreak this week. Spot it low within the east-southeast about 40 minutes earlier than dawn. Search for it very far under Arcturus and maybe a bit to the suitable (relying in your latitude).

Mercury is decrease left of fainter Mars and Spica.

Mars (magnitude +1.7, in Libra) is low within the east-southeast in early daybreak, to the higher proper of Mercury. Brighter Spica shines farther higher proper of Mars. This lengthy line of three expands from 33° to 43° in size this week, as Mercury sinks decrease and Mars and particularly Spica transfer larger.

Venus (magnitude –three.9, in Sagittarius) shines within the southwest in night twilight, a bit larger every week. It is on its means as much as a grand, excessive “Night Star” apparition all this winter and nicely into spring.

Jupiter (magnitude –1.eight) strikes farther to the decrease proper of Venus in twilight and turns into ever trickier to identify earlier than it units. The hole between them will increase from 13° to 20° this week.

Saturn on Nov 20, 2019

Saturn on November 20th, imaged by Damian Peach with the 1-meter Chilescope. South is up. This, he notes, is “a late-apparition picture [i.e. the planet is not very high in darkness, even from Chile]. Seeing was honest. In all probability my final one among this apparition. Little exercise, however the polar hexagon is nicely seen together with the central polar spot.”

Saturn (magnitude +zero.6, additionally in Sagittarius) is the modest, regular yellow “star” close to Venus — which outshines it by 60 instances! Discover Saturn 5° to Venus’s higher higher left at the start of the week, and seven° to Venus’s proper or decrease proper at week’s finish.

They’re in conjunction, slightly below 2° aside, on December 10th and 11th.

Uranus (magnitude 5.7, in southern Aries) and Neptune (magnitude 7.9, in japanese Aquarius) stand about equally excessive within the south and southeast, respectively, proper after darkish. Use our finder charts for Uranus and Neptune.


All descriptions that relate to your horizon — together with the phrases up, down, proper, and left — are written for the world’s mid-northern latitudes. Descriptions that additionally rely on longitude (primarily Moon positions) are for North America.

Jap Commonplace Time (EST) is Common Time (UT, UTC, GMT, or Z time) minus 5 hours.


Audio sky tour. Out underneath the night sky along with your earbuds in place, hearken to Kelly Beatty’s month-to-month podcast tour of the heavens above. It is free.


“The risks of not pondering clearly are a lot larger now than ever earlier than. It isn’t that there is one thing new in our mind-set, it is that credulous and confused pondering might be rather more deadly in methods it was by no means earlier than.”
– Carl Sagan, 1996

“Details are cussed issues.”
– John Adams, 1770




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