花生中国哪里最多:This Week's Sky at a Glance for February 4 – 12

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This Week's Sky at a Glance

Some daily events in the changing sky for February 4 – 12.

by Alan M. MacRobert

Watchthe Moon pass Jupiter as it waxes from evening to evening. You'll haveno trouble spotting them; they're the two brightest objects in theevening sky. (These scenes are drawn for the middle of North America.European observers: move each Moon symbol a quarter of the way towardthe one for the previous date.)Sky & Telescope diagramFriday, February 4

  • Sirius transits the meridian ofthe sky (i.e. is due south) around 9 or 10 p.m. this week, depending onwhere you live east or west in your time zone. Sirius is the brighteststar in all the sky (after the Sun). The second brightest isfar-southern Canopus. By coincidence, Canopus and Sirius transit atnearly the same time. If you live at least as far south as Atlanta,Phoenix, or Los Angeles, see if you can spot Canopus just above thesouth point on your horizon when Sirius is approaching the meridian.(Canopus transits 20 minutes before Sirius.)
  • Jupiter's Great Red Spot crosses Jupiter's central meridian around 7:12 p.m. Pacific Standard Time.
  • A dawn challenge! Just before the first light of dawnSaturday morning for your location, get your telescope or binoculars onVenus low in the southeast. Look 3½° south (lower right) of it for theLagoon Nebula, M8 — a cold winter preview of a summer object. Good luck!Also nearby is the asteroid Vesta, magnitude 7.8. See the article andchart in the February Sky & Telescope, page 57.

    Saturday, February 5

  • Jupiter and the waxingcrescent Moon inhabit the western sky during twilight and early eveningtonight and for the next few nights, as shown above.

    Sunday, February 6

  • Jupiter and the crescent Moon are lined up in the west at dusk, as shown above.

    Monday, February 7

  • The Moon is over Jupiterthis evening. Look to their right for the Great Square of Pegasus,tipped onto one corner. (Two of its stars show in the scene above.)

    Tuesday, February 8

  • You may know of thefine winter star cluster M41, visible in binoculars about one binocularfield south of Sirius. But what about the cluster M50? Follow a linefrom Sirius to the tip of Canis Major's nose (Theta Canis Majoris),continue nearly as far exactly straight onward, and there you are. M50is magnitude 5.9, quite a bit fainter than M41's magnitude 4.5.

    In the same field with M50 is another, the fainter cluster: NGC 2343, atougher catch at magnitude 6.7. For a finder chart and more about theseobjects, see Gary Seronik's Binocular Highlight column in the February Sky & Telescope, page 45.

  • Before the start of dawn Wednesday morning, the asteroid Vesta is 0.4°north of Venus. They're magnitudes +7.8 and –4.3, respectively, a70,000-times difference in brightness!

    Wednesday, February 9

  • The eclipsing binarystar Algol (Beta Persei) should be at minimum brightness, magnitude 3.4instead of its usual 2.1, for a couple hours centered on 10:18 p.m. EST;7:18 p.m. PST. Algol takes several additional hours to fade and torebrighten.

    Thursday, February 10

  • First-quarter Moontonight (exact at 2:18 a.m. Friday morning EST). Look upper left of theMoon for the Pleiades. Farther left of the Pleiades shines Aldebaran.
  • Another dawn challenge! Just before the first light of dawnFriday morning for your location, aim your scope or binoculars at Venuslow in the southeast. Look nearly 3° south (lower right) of it for thehazy little glow of the globular cluster M22 (5th magnitude). Upperright of M22, by 7½°, is the larger dim glow of the Lagoon Nebula, M8.Also nearby is the asteroid Vesta, magnitude 7.8. See the article andchart in the February Sky & Telescope, page 57.

    Friday, February 11

  • The Moon shines nearthe Pleiades after dusk (for the time zones of the Americas). Binocularsgive a fine view. Watch the Moon move along its orbit with respect tothe cluster as the hours pass.

    Saturday, February 12

  • The Moon shines in Taurus this evening, inside the broad triangle formed by Aldebaran, the Pleiades, and Elnath (Beta Tauri).
  • Algol is at its minimum brightness for a couple hours centered on 7:07 p.m. EST.


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