FRIDAY, APRIL 1

■ This is the time of year when the dim Little Dipper juts to the right from Polaris (the Little Dipper's handle-end) during late evening. The much brighter Big Dipper curls over high above it, "dumping water" into it. They do the reverse water dump in the fall.

■ New Moon (exact at 2:24 a.m. EDT on this date).

Venus, Saturn and Mars at dawn, April 2, 2022
To the right of Venus in early dawn, Saturn will soon pass Mars. On Saturday morning April 2nd they're 1.8° apart. Three days later on the morning of the 5th, they pass just 0.4° apart (at the times of dawn for the Americas).

SATURDAY, APRIL 2

■ Castor and Pollux shine very high to the southwest after dark this week, far above Orion and lined up almost horizontally. Pollux is slightly the brighter of these "twins."

Draw a line from Castor through Pollux, follow it farther out by a big 26° (about 2½ fist-widths at arm's length), and you're at the dim head of Hydra, the Sea Serpent. In a dark sky it's a subtle but distinctive star grouping, about the width of your thumb at arm's length. Binoculars show it easily through light pollution or moonlight, though it slightly overspills some binoculars' field of view.

Continue the line farther by about a fist and a half and you hit Alphard, Hydra's 2nd-magnitude orange heart.

Another way to find the head of Hydra: It's almost midway from Procyon to Regulus.

SUNDAY, APRIL 3

■ Do you know why the Beehive cluster, M44 in Cancer, is called the Beehive? In binoculars or a small telescope, its central rows of stars suggest a traditional twisted-straw beehive (a "skep") with a wide base and domed top. It's more or less upright now after dark. A couple of 7th-magnitude bees emerge from its top in a little curved line. More bees swarm around.

To find the Beehive with binoculars or a finderscope, first aim at the exact halfway point between Pollux and Regulus. Then shift 4° or 5° west-southwest from there. That currently means to the lower right. That distance is almost one field-width in typical binoculars.

For more about the Beehive and its near surroundings, see Matt Wedel's Binocular Highlight column and chart in the April Sky & Telescope, page 43.

Venus, Saturn and Mars at dawn, April 4, 2022
Now Saturn and Mars are only 0.5° apart for North America, almost at their closest together. The fainter star 2° below them is Delta Capricorni, magnitude 2.8. Use binoculars as the sky brightens.

MONDAY, APRIL 4

■ This evening the waxing crescent Moon hangs to the lower left of the Pleiades, as shown below. To their upper left, Aldebaran forms one tip of the Hyades's V asterism. The V is vertical when it descends in the west in early spring, after lying horizontal when climbing up in the east in late fall and early winter.

The waxing crescent Moon passes the Pleiades and Aldebaran, April 3-6, 2022.
The waxing crescent Moon passes the Pleiades, Aldebaran, and Aldebaran's surrounding Hyades. (The scene is drawn for just after the end of twilight, which may or may not be at 9 pm where you live.)
Saturn and Mars in conjunction near Venus, April 5, 2022
The Saturn-Mars pair is tightest on the morning of Tuesday the 5th; they're separated by 0.4°. From now on they will widen (by 0.7° per day).

TUESDAY, APRIL 5

■ Now the Moon hangs upper right of Aldebaran and the Hyades, as shown above.

■ Shortly after the end of twilight around this time of year, Arcturus, the bright Spring Star climbing in the east, stands just as high as Sirius, the brighter Winter Star descending in the southwest (for skywatchers at mid-northern latitudes).

These are the two brightest stars in the sky at the time. But Capella is a very close runner-up to Arcturus! Spot it high in the northwest.

WEDNESDAY, APRIL 6

■ Now the Moon shines between the horn-tip stars of Taurus: Beta and fainter Zeta Tauri, as shown above.

■ Capella, high in the northwest during and after dusk, has a pale yellow color matching the Sun's, meaning they're about the same temperature. But otherwise Capella is very different. It consists of two yellow giant stars orbiting each other every 104 days.

Moreover, for telescope users, it's accompanied by a distant, tight pair of red dwarfs: Capella H and L, magnitudes 10 and 13. That's about 10,000 and 60,000 times fainter than Capella itself! Article and finder charts.

THURSDAY, APRIL 7

■ Thicker and brighter every evening, the Moon now stands almost midway between Capella and Procyon to its right and left, two or three fists from each.

■ High above the Big Dipper these evenings, nearly crossing the zenith, are three pairs of dim naked-eye stars, all 3rd or 4th magnitude, marking the Great Bear's feet. They're also known as the Three Leaps of the Gazelle, from early Arab lore. They form a long east-west line (about three fists long) roughly midway between the Bowl of the Big Dipper and the Sickle of Leo. See the evening constellation chart in the center of the April Sky & Telescope.

In the Arabian story the gazelle was drinking at a pond — the big, dim Coma Berenices star cluster to the Leaps' east — and it bounded away when startled by a flick of Leo's nearby tail, Denebola. Leo, however, seems quite uninvolved; he's facing the other way.

FRIDAY, APRIL 8

■ The first-quarter Moon this evening forms a tall, nearly isosceles triangle with Pollux and Castor above it: the two top stars of the Arch of Spring. The Moon is about 8° from each. The stars are 4½° apart.

The rest of the Arch of Spring consists of Procyon to the stars' lower left, and Menkalinan and then bright Capella farther to their lower right.

■ Over and done are the planetary triangles and bunchings that have highlighted the early dawn. Venus, Mars, and Saturn now form an expanding diagonal line, as shown below. From now on it will just get longer and longer.

The Venus-Mars-Saturn line will continue lengthening until, by late summer, it extends all the way across the dawn sky from east to west always in the same order as here.

SATURDAY, APRIL 9

■ Now the Moon shines left or upper left of Pollux and Castor in the evening.

■ Right after dark, Orion is still well up in the southwest in his spring orientation: striding down to the right, with his belt horizontal. The belt points left toward Sirius and right toward Aldebaran and, farther on, the Pleiades.

 

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This Week's Planet Roundup

Mercury, Jupiter, and Neptune remain deep in the glare of the Sun. Soon, however, Jupiter will begin to reappear low in the dawn.

Venus, magnitude –4.4, is the bright "Morning Star" shining low in the southeast during dawn.

Mars and Saturn glimmer to Venus's right. They're vastly fainter: almost identical at magnitudes +1.1 and +0.9. Mars, however, is more orange than pale yellow Saturn.

They pass each other by about ½° on the mornings of April 4th and 5th; see the illustrations above. Bring binoculars in case dawn is getting too bright.

Uranus (magnitude 5.9 in Aries) is disappearing into the afterglow of 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 and graphics that also depend on longitude (mainly Moon positions) are for North America.

Eastern Daylight Time, EDT, is Universal Time minus 4 hours. (Universal Time is also called UT, UTC, GMT or Z time.)


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. (It applies just as much to charts on your phone or tablet as to charts on paper.)

You'll also want a good deep-sky guidebook. A beloved old classic is the three-volume Burnham's Celestial Handbook. An impressive more modern 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


 

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Comments


Image of Anthony Barreiro

Anthony Barreiro

April 1, 2022 at 5:36 pm

It makes more sense to me to say that Mars is passing Saturn, rather than Saturn passing Mars. From one dawn to next and one week to the next, Saturn is staying in the same place in the sky north of the star Deneb Algedi, while Mars is moving eastward relative to both Saturn and the fixed stars. Mars is moving faster than Saturn and has a smaller orbit around the Sun. And because Mars is closer to Earth, parallax makes Mars appear to move farther than Saturn as Earth moves in her orbit.

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mary beth

April 4, 2022 at 11:26 am

I would love to see that on a 3-D model! So much to think about and I love it! Thanks for your explanation. I hope you are doing well and having clear skies and a nice season!

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Anthony Barreiro

April 4, 2022 at 5:19 pm

https://www.fourmilab.ch/cgi-bin/Solar

Play around with the settings to make the model fit your screen.

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mary beth

April 5, 2022 at 12:08 pm

This is great Anthony, thank you so much!

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Rod

April 2, 2022 at 12:07 pm

I was able to enjoy some solar observing this morning after a period of snow flurries, clouds, and rain. [Observed 1030-1130 EDT/1430-1530 UT. Sunspot active regions AR2976, AR2975, and AR2978 are larger than earth size with dark cores and lighter areas around them. Plenty of plage visible near AR2975 and AR2976 this morning. Sellarium 0.22.0 shows the Sun's distance is 1 AU. Earth size sunspots ~ 17.6 arcsecond. Sun's angular size ~ 32 arcminute. I used TeleVue 40-mm plossl with glass white light solar filter for 25x views. True FOV ~ 108 arcminute and resolution ~ 12 arcsecond on the Sun, about 8703 km diameter. Spaceweather.com reports, "Sunspot complex AR2978-AR2981 has a 'beta-gamma' magnetic field that harbors energy for M-class solar flares. Credit: SDO/HMI" Clear skies this morning, temperature 7C, winds NW/5 knots. No more wood burning stove, weed trimming, and cutting grass using my little tractor now :)]

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Rod

April 4, 2022 at 6:27 am

Some unaided eye viewing of Venus, Saturn, and Mars this morning shortly after 0600 EDT. Very lovely paring of Mars and Saturn. Saturn and Mars separated by a bit more than 0.5-degrees (Stellarium shows 33 arcminute) this morning, tomorrow morning close to 0.3-degrees angular separation between the two. A lovely sight to see early this morning. Jupiter too low behind some trees to see clearly. Weather, clear skies at my location, temperature 3C, winds NW 5 knots. I did not setup the telescope to view, early morning hot coffee excellent 🙂

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mary beth

April 4, 2022 at 11:23 am

Yesterday evening was beautiful in Houston Texas for stargazing. The Arch of Spring made a lovely canopy. I could see Capella and some of her kids, high in the northwest.Canopus was lurking low past the meridian but still very bright and twinkly. Castor and Pollux were directly overhead. Lovely earthshine on the 4.9% waxing crescent moon that smiled upon us. The ISS passed over for three minutes traveling north to northeast; quite low but we were able to see it the entire time. That is an unusual and rare visible route for our location. It actually came back over about 90 minutes later but it was too cloudy to see. We waited until we could see Arcturus over the house tops before we went inside. We had to go back out about 20 minutes later to help a neighbor and I could not believe how cloudy it got in that short of time. When we went inside about 8:45 PM it was crystal clear but when we went back outside it was about 50% sky cover. Very fast moving clouds from the south. possible rain showers tonight and then a refreshing cold front Wednesday. We will be in the 90s tomorrow so the slight cold front will be welcome!

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Rod

April 4, 2022 at 1:14 pm

Good report mary beth. In the 90s at Houston TX? Here in MD we are still running around 60-65F. Perhaps next week 75F. However, my ride mower, my little tractor is all tuned-up and I did some pasture cutting the other day. Soon weed trimmer will be whacking 🙂 The cloud coverage for my location is problematic, sometimes short periods with more clear sky, other times plenty of clouds, including rain at times.

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mary beth

April 5, 2022 at 12:21 pm

Sounds like your weather is very nice and springy! I know you enjoy all the different duties of the seasons! And yes we are predicted to be 90 today. My brother lives in Marble Falls in Central Texas and there they had an official high of 93° on March 26! But it was not humid there like it is in Houston. Unfortunately we get a double whammy!

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