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Home Outer space

This Week’s Sky at a Glance, January 21 – 29

by TimesOfNation
January 23, 2022
in Outer space
This Week’s Sky at a Glance, January 21 – 29
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This Week’s Sky at a Glance, January 21 – 29: Times Of Nation

FRIDAY, JANUARY 21

■ Jupiter still shines brightly in the southwest at dusk, though lower each week. It makes a perfectly nice, if second-place, “Evening Star” now that Venus has departed.

Fomalhaut still twinkles 20° (about two fists at arm’s length) to Jupiter’s lower left. The farther south you are, the less low you’ll have to look to catch Fomalhaut in late twilight.

Jupiter, the second-place “Evening Star” after Venus, has the evening twilight sky to itself . . .
. . .now that Venus has run off to claim its new title as “Morning Star.” Mars looks unimpressed. Or maybe the puny little God of War is embarrassed by being so outclassed by the dazzling, overpowering Goddess of Love. When Mars is in the vicinity of Venus, it is always shrunken and tiny like this. Can you figure out why? Answer at the bottom of this page.

■ The early-evening sky is dark now until the waning Moon rises about 9 p.m. Is your sky dark enough for you to see the winter Milky Way? After dinnertime it runs vertically from Canis Major low in the southeast, up between Orion and Gemini, through Auriga and Perseus overhead, and down through Cassiopeia, Cepheus, and Cygnus to the northwest horizon.

■ Iris in Gemini. The asteroid 7 Iris, magnitude 7.8. is just a week past opposition and nicely placed high in the east by 7 or 8 p.m. It’s in Gemini under the Pollux stick-figure twin, and above Procyon. Bring your telescope or large binoculars and the finder chart in the January Sky & Telescope, page 49.

Note: The date ticks on that chart, like on all of S&T’s asteroid and comet charts, mark 0:00 Universal Time for the dates indicated. In North America this moment falls in the early evening of the previous date.

Unsure how to relate what you see on the chart to what you see (or don’t) in your finderscope or eyepiece? The essential tricks you need await you in How to Use a Star Chart with a Telescope. They apply just as much to a chart onscreen as to a chart on paper.

SATURDAY, JANUARY 22

■ Zero-magnitude Capella high overhead, and equally bright Rigel in Orion’s foot, have almost the same right ascension. This means they cross your sky’s meridian at almost exactly the same time: around 9 p.m. now, depending on how far east or west you live in your time zone. So whenever Capella passes its very highest, Rigel always marks true south over your landscape, and vice versa.

Capella goes exactly through your zenith if you’re at latitude 46° north: Portland, Oregon; Montreal; central France.

■ High overhead, the prototype eclipsing binary star Algol should be at its minimum brightness, magnitude 3.4 instead of its usual 2.1, for a couple hours centered on 8:46 p.m. EST. Algol takes several additional hours to fade and to rebrighten. You can always compare it at a glance to nearby Gamma Andromedae (Andromeda’s bright foot), magnitude 2.1.

Algol comparison-star chart
When Algol is at its normal brightness it matches Gamma Andromedae, magnitude 2.1. But at mid-eclipse it’s a match for the far point of dim Triangulum, magnitude 3.4.

On all our star maps north is up, east is left.

SUNDAY, JANUARY 23

■ Orion is now high in the southeast right after dark, and he stands highest due south around 9 p.m. Orion is the brightest and showiest of the 88 constellations — and that often distracts from the fact that his main pattern is surprisingly small compared to some of his dimmer neighbors. The biggest of these is Eridanus the River to his west, enormous but hard to trace. Dimmer Fornax the Furnace, to Eridanus’s lower right, is almost as big as Orion! Even the main pattern of Lepus, the Hare cowering under Orion’s feet, isn’t much smaller than he is. Compared to Orion, the rabbit is the size of a Saint Bernard.

MONDAY, JANUARY 24

■ The last-quarter Moon rises around midnight tonight. Once it’s up, look for Spica roughly a fist to its upper right, and brighter Arcturus three fists to their upper left.

By early dawn Tuesday morning the Moon is high in the south, now with Spica to its right and Arcturus above it. The Moon is exactly last-quarter at 8:41 a.m. Tuesday morning EST (5:51 a.m. Pacific). At that time it’s in view throughout North America, whether in darkness or daylight.

TUESDAY, JANUARY 25

■ Sirius twinkles brightly after dinnertime below Orion in the southeast. Around 8 p.m., depending on your location, Sirius shines precisely below fiery Betelgeuse in Orion’s shoulder. How accurately can you time this event for your location, perhaps judging against the vertical edge of a building? Earlier in the evening, Sirius leads. Later in the evening, Betelgeuse leads.

WEDNESDAY, JANUARY 26

■ After dark, face east and look very high. The bright star there is Capella, the Goat Star. To the right of it, by a couple of finger-widths at arm’s length, is a small, narrow triangle of 3rd and 4th magnitude stars known as “the Kids.” Though they’re not exactly eye-grabbing, they form a never-forgotten asterism with Capella.

THURSDAY, JANUARY 27

■ The big Northern Cross in Cygnus, topped by Deneb, stands nearly upright over the northwest horizon after dark. As evening grows late it sinks to the horizon and on down into it, like a sword plunging into the ground.

FRIDAY, JANUARY 28

■ Right after dark, face east and look very high, almost straight up. The bright star there is Capella, the Goat Star. To the right of it, by a couple of finger-widths at arm’s length, is a small, narrow triangle of 3rd- and 4th-magnitude stars known as “The Kids.” Though they’re not exactly eye-grabbing, they form a never-forgotten asterism with Capella.

Waning Moon, Venus, Mars, Jan. 28-30, 2022.
In early dawn on Saturday morning the 29th, look southeast for Venus and the crescent Moon. Are you out early enough to see Mars? Your chances are better in a darker sky 50 or 60 minutes before sunrise. Later that that, use binoculars.

SATURDAY, JANUARY 29

■ Spot the equilateral Winter Triangle in the southeast. Sirius is its brightest and lowest star. Betelgeuse stands above Sirius by about two fists at arm’s length. To the left of their midpoint is Procyon.

Can you discern their colors? Sirius (spectral type A0) is cold white, Betelgeuse (M2) is pale orange, and Procyon (F5) is much paler yellowish white.

And, standing 4° above Procyon is 3rd-magnitude Gomeisa, or Beta Canis Minoris, the only other easy naked-eye star of Canis Minor.

■ Meanwhile, the Great Square of Pegasus is sinking low in the west, tipped onto one corner. And the Big Dipper is creeping up in the north-northeast, tipped up on its handle.

 

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This Week’s Planet Roundup

Mercury and Saturn have ridden away into the sunset.

Venus (magnitude –4.6) is climbing up into the dawn. Look for it low in the east-southeast in early dawn. In a telescope or even good binoculars it’s a crescent, thickening and shrinking each week.

Mars, vastly fainter at magnitude +1.4, is low in the southeast in early dawn to the right of Venus. They’re 15° apart on the morning of January 22nd, closing to 10° on the 29th (when the thin Moon shines near Mars). Brighter, Mars-colored Antares in Scorpius shines far to the upper right. See illustrations above.

Both Venus and Mars are in Sagittarius. Stars of the Teapot are below them.

Mars is on the far side of its orbit from us, so in a telescope it’s just a tiny blob 4.2 arcseconds wide.

Jupiter (magnitude –2.0, in Aquarius) still shines brightly in the southwest at dusk, lower every week.

Uranus (magnitude 5.7, in Aries) is very high in the south in early evening. Finder chart.

Neptune (magnitude 7.9, in Aquarius) is much lower in the southwest after dark, some 16° upper left of Jupiter. It’s invisible without optical aid and a good finder chart.


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 and graphics that also depend on longitude (mainly Moon positions) are for North America.

Eastern Standard Time, EST, is Universal Time (also called UT, UTC, GMT, or Z time) minus 5 hours.


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 magazine of astronomy.

Once you get a telescope, to put it to good use you’ll need a detailed, large-scale sky atlas (set of charts). The basic standard is the Pocket Sky Atlas (in either the original or Jumbo Edition), which shows stars to magnitude 7.6.

Pocket Sky Atlas cover, Jumbo edition
The Pocket Sky Atlas plots 30,796 stars to magnitude 7.6, and hundreds of telescopic galaxies, star clusters, and nebulae among them. Shown here is the Jumbo Edition, which is in hard covers and enlarged for easier reading outdoors by red flashlight. Sample charts. More about the current editions.

Next up is the larger and deeper Sky Atlas 2000.0, plotting stars to magnitude 8.5; nearly three times as many. The next up, once you know your way around, are the even larger Interstellarum atlas (stars to magnitude 9.5) or Uranometria 2000.0 (stars to magnitude 9.75). And be sure to read How to Use a Star Chart with a Telescope. Yes, it applies just as much to charts onscreen as to charts on paper.

You’ll also want a good deep-sky guidebook. An impressive one is the big Night Sky Observer’s Guide set (2+ volumes) by Kepple and Sanner.

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, meaning heavy and expensive. And 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.”


Audio sky tour. Out under the evening sky with your
earbuds in place, listen to Kelly Beatty’s monthly
podcast tour of the heavens above. It’s free.


“The dangers of not thinking clearly are much greater now than ever before. It’s not that there’s something new in our way of thinking, it’s that credulous and confused thinking can be much more lethal in ways it was never before.”
            — Carl Sagan, 1996

“Facts are stubborn things.”
            — John Adams, 1770


 

*Answer to why Mars is tiny and faint when near Venus. Seen from Earth, Venus always appears fairly near the Sun in our sky. That’s because it orbits closer to the Sun than we do.

But Mars orbits farther out from the Sun than we do. That means that whenever Mars appears near our line of sight to the Sun (its only chance to appear near Venus), Mars is on the far side of its orbit from us. And that means it’s about as distant and tiny as it can get.

 

(News Source :Except for the headline, this story has not been edited by Times Of Nation staff and is published from a skyandtelescope.org feed.)

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