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Space Science Digital > Blog > Cosmology > The Sky This Week from February 10 to 17
Cosmology

The Sky This Week from February 10 to 17

By Aimee Daly February 10, 2023 7 Min Read
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Tuesday, February 14

Venus sidles up to Neptune in the evening twilight as the planets prepare for tomorrow’s conjunction. An hour after sunset, the pair is 13.5° high in the west, with Venus impossible to miss at magnitude –3.9. Look with binoculars to find faraway Neptune, magnitude 7.8, about 33′ northeast of Venus’ bright gibbous disk. If you can’t spot the ice giant just yet, wait a little longer for the sky to grow darker. Within the next 24 hours, Venus will first cross due south of Neptune, then appear northeast of the distant planet by evening. We’ll return tomorrow for another look.

Once the sky grows a little darker still, celebrate Valentine’s Day with a view of the stunning red Heart Nebula in Cassiopeia. The constellation sits to the upper left of the Little Dipper in the north this evening. The Heart Nebula, also cataloged as IC 1805, is a magnitude 6.5 emission nebula just under 5° east-southeast of magnitude 3.4 Epsilon (ε) Cassiopeiae. It’s best viewed with a larger (8-inch or more) telescope, though you can use low or high magnification to bring out different aspects of its structure. A nebula filter will further enhance the view. Look particularly for NGC 896, a bright knot of glowing gas and dust that sits southwest of the Heart proper and is a little easier to see than the larger, fainter nebula. You can also find NGC 1027, a 7th-magnitude star cluster, just over 1° east of the Heart.

Sunrise: 6:54 A.M.
Sunset: 5:35 P.M.
Moonrise: 1:53 A.M.
Moonset: 11:19 A.M.
Moon Phase: Waning crescent (38%)

Wednesday, February 15

Venus passes 0.01° south of Neptune at 7 A.M. EST this morning. Let’s return to the pair in the evening sky to see how the view has changed since yesterday.

An hour after sunset, Venus is now some 35′ northeast of Neptune as the former travels quickly along the ecliptic. Both planets will still fit into the same telescopic or binocular field of view, with tiny, 2″-wide Neptune popping out as the sky grows darker. The ice giant will look like a small, round, “flat” star colored bluish-gray. Meanwhile, Venus’ bright disk is nearly 90 percent lit and spans 12″, six times as wide as Neptune. Venus is much smaller than Neptune in reality, of course, but its much closer proximity makes it appear significantly larger in our sky.

Tonight, Venus sits right on the border between Pisces and Aquarius; the planet will have moved firmly into Pisces by tomorrow. Neptune is following at a more sedate pace and won’t make the border crossing into Pisces until March 4.

Sunrise: 6:53 A.M.
Sunset: 5:36 P.M.
Moonrise: 3:05 A.M.
Moonset: 12:07 P.M.
Moon Phase: Waning crescent (28%)

Thursday, February 16

Saturn is in conjunction with the Sun at 12 P.M. EST, rendering it invisible for the rest of February. However, the ringed planet will make its reappearance in the morning sky next month.

If you’ve been observing Venus and Neptune for the past two nights, you’re already familiar with the region of sky we’ll be visiting tonight. Again, look west after sunset and you’ll see the large figure of Cetus the Whale stretching above the horizon. This time, we’re focusing east (to the upper right) of the planets to zero in on an excellent target for small scopes: the galaxy M77.

Spanning about 7′ by 6′, this slightly elongated spiral glows at 9th magnitude. You can find M77 by sliding a mere 0.9° east of 4th-magnitude Delta (δ) Ceti. M77 is an excellent example of an active galaxy, whose central supermassive black hole is greedily gobbling up material. However, the black hole’s accretion disk is not so bright that it outshines the galaxy, as happens with quasars. Instead, M77 is classified as a Seyfert galaxy, whose center shows indications of a feeding black hole without overpowering the light from its host. The galaxy’s center is visually bright largely because of the abundance of stars there, with fainter spiral arms visible through larger scopes.

Sunrise: 6:52 A.M.
Sunset: 5:37 P.M.
Moonrise: 4:15 A.M.
Moonset: 1:08 P.M.
Moon Phase: Waning crescent (18%)

Friday, February 17

Early this morning, a delicate crescent Moon sits near the Teapot asterism in Sagittarius. Look southeast about an hour before sunrise to find Earth’s natural satellite some 4° above the horizon, hanging to the lower left (east) of the Teapot’s handle. Just off the tip of the Teapot’s spout, marked by Gamma (γ) Sagittarii, is the Milky Way’s galactic center and its supermassive black hole, Sagittarius A*.

Look farther right of that spout and you’ll run right into the large, winding figure of Scorpius, sitting on his tail just above the horizon. Most obvious will be his bright red heart, magnitude 1.1 Antares, a glowing red giant star in the later stages of its life. Before twilight truly begins to break, you can enjoy several star clusters within the Scorpion, particularly by sweeping through the constellation with binoculars. The open clusters M6 and M7 lie close together near Shaula in the tail, while M4 and M80 are both globulars that sit up near Antares and the Scorpion’s head.

Sunrise: 6:50 A.M.
Sunset: 5:38 P.M.
Moonrise: 5:16 A.M.
Moonset: 2:20 P.M.
Moon Phase: Waning crescent (10%)



TAGGED: callisto, comet ztf, conjunction, February, ganymede, green comet, heart nebula, jupiter, last quarter moon, m77, mars, Neptune, pallas, Sky, taurus, venus, Week

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Aimee Daly February 10, 2023
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