#astronomy This Week’s Sky at a Look, December 6 – 14

December 6, 2019 - Comment

Jupiter is disappearing deep into the sundown, whereas Venus, having ditched Jupiter, is on its solution to flirt with Saturn. The blue 10° scale is in regards to 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

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

Jupiter is disappearing deep into the sundown, whereas Venus, having ditched Jupiter, is on its solution to flirt with Saturn. The blue 10° scale is in regards to 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 12 months 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 might be clear sufficient to look at it from Jacksonville as properly.” Additional particulars may be discovered on IOTA’s webpage.

Saturday, Dec. 7

• Vega continues 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’ll be able to search for the Nice Sq. of Pegasus crossing the meridian excessive within the south.

• Earliest sundown of the 12 months, if you happen to reside close to latitude 40° north. Although 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 does not come up its newest till January 4th. Why? Blame the lean of Earth’s axis and the eccentricity of Earth’s orbit.

Sunday, Dec. eight

• Orion absolutely 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, good Sirius now rises round eight or 9.

Monday, Dec. 9

• At the moment of 12 months the Massive 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 fantastic view excessive within the northeast!

Tuesday, Dec. 10

• Venus and Saturn are just below 2° aside in late twilight this night and tomorrow night. Look quite 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 (precise 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 increased 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 just 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 evening, 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 solution to disappearing into the sundown by 12 months’s finish.

Friday, Dec. 13

• The Geminid Meteor bathe, normally among the best of the 12 months, must be at its peak late tonight and tomorrow evening. However the waning gibbous Moon will gentle 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, when you’ve got a wide-open view of the sky overhead and protect 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 environment.

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 fitting of Gemini sparkles Orion.


Need to turn out to be a greater astronomer? Study 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 out of doors nature pastime. For an easy-to-use constellation information overlaying the entire night sky, use the large month-to-month map within the heart of every subject 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 bunch of telescopic galaxies, star clusters, and nebulae amongst them. Proven above is the Jumbo Version for simpler studying within the evening. Pattern 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 fundamental customary is the Pocket Sky Atlas (in both the unique or Jumbo Version), which exhibits stars to magnitude 7.6.

Subsequent up is the bigger and deeper Sky Atlas 2000.zero, plotting stars to magnitude eight.5; almost thrice as many. The following up, as soon as you realize your means round, are the even bigger Interstellarum atlas (stars to magnitude 9.5) and Uranometria 2000.zero (stars to magnitude 9.75). And skim how you can use sky charts with a telescope.

You may additionally desire a good deep-sky guidebook, akin to Sue French’s Deep-Sky Wonders assortment (which incorporates its personal charts), Sky Atlas 2000.zero Companion by Robust and Sinnott, or the larger Evening Sky Observer’s Information by Kepple and Sanner.

Can a computerized telescope substitute charts? Not for newbies, 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 Yard Astronomer’s Information, “A full appreciation of the universe can not come with out creating the abilities to seek 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 right down to the decrease left whereas Mars works it means somewhat increased towards the higher proper.

Mercury, magnitude –zero.6 all week, steadily 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 somewhat to the fitting (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 increased.

Venus (magnitude –three.9, in Sagittarius) shines within the southwest in night twilight, somewhat increased every week. It is on its means as much as a grand, excessive “Night Star” apparition all this winter and properly 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 in every of this apparition. Little exercise, however the polar hexagon is properly 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, just 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 upon longitude (primarily Moon positions) are for North America.

Japanese Customary 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, take heed to Kelly Beatty’s month-to-month podcast tour of the heavens above. It is free.

“The risks of not considering 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 considering may be way more deadly in methods it was by no means earlier than.”
– Carl Sagan, 1996

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

Supply hyperlink


Comments are disabled for this post.