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- From: bcollins@utdallas.edu (ARLIN B COLLINS)
- Subject: Sky&Telescope Weekly News Bulletin
- Message-ID: <C1E7ss.4I9@utdallas.edu>
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- Organization: Univ. of Texas at Dallas
- Date: Mon, 25 Jan 1993 04:43:40 GMT
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-
- ***
- SKY & TELESCOPE NEWS BULLETIN -- JANUARY 23, 1993
-
- DAZZLING PLANETS
- Venus and Mars currently dominate the evening sky, and with good
- reason. Mars passed its closest to Earth on January 3rd, at which time
- it was 58 million miles away. Right now the red planet shines at
- magnitude -1.3 and its disk is 15 arc seconds across. Venus, meanwhile,
- reached its greatest elongation east of the Sun, 47 degrees, on January
- 19th. It's a dazzling magnitude -4.4 right now. However, its moment of
- greatest brilliancy, - 4.6, is still a month away.
-
- YOUNG CRESCENT MOON
- There will be a day-old crescent Moon low in the west-southwest sky
- just after sunset on the evening of Saturday, the 23rd. Can you see it?
- It will be 34 degrees to the lower-right of Venus. If you manage to nab
- the Moon, look 5 degrees to its left for Saturn. Remember, these will
- be very far down in the murk, so an unobstructed western horizon will
- be essential.
-
- COMET MUELLER, 1993a
- There's a new orbit out for Comet Mueller, which was discovered by
- Palomar observer Jean Mueller on January 6th. Not a whole lot has
- changed, though the perihelion date has shifted about 10 days to
- January 13th, 1994, almost a year from now. By then Comet Mueller will
- have cruised inward along its retrograde parabolic route to a point 180
- million miles from the Sun. Right now the comet is a distant
- 14th-magnitude smudge in Ursa Major, and it's expected to brighten only
- by one magnitude between now and May. So its prospects for ever
- achieving naked-eye visibility are slim.
-
- COMET SCHWASSMANN-WACHMANN 1
- Jane Luu and Dave Jewitt, who gained fame a few months ago for
- discovering a solar-system object beyond Pluto, recently set their
- telescopic sights on Periodic Comet Schwassmann-Wachmann 1. They think
- they're observing the comet's nucleus directly, and that it spins ever
- 10 hours with a half-magnitude variation. Studies of the comet's jets
- had suggested a somewhat longer spin rate, more like 5 days. But the
- two astronomers note that 10 hours is more in line with the rotations
- they've found in other short-period comets."
-
- LEAP SECOND
- And here's an event to look forward to this summer. Bulletin C5 of the
- International Earth Rotation Service announces that a positive leap
- second will be introduced on the night of June 30th. That means that at
- 11:59 p.m. the count of seconds will be 59, 60, 0. That's in
- coordinated Universal time, of course. You heard it first here, folks.
-
- ----- THIS WEEK'S "SKY AT A GLANCE"
-
- JAN 24 -- SUN
- *
-
- JAN 25 -- MON
- The eclipsing variable star Algol is at minimum light, magnitude 3.4
- instead of its usual 2.1, for a couple of hours centered on 6:10 p.m.
- Eastern standard time. It takes several additional hours to brighten
- again.
-
- JAN 26 -- TUE
- The crescent Moon shines close to brilliant Venus during and after dusk
- tonight -- a fine sight (and photo opportunity. Use a long lens and
- look for interesting foreground scenery.)
-
- JAN 27 -- WED
- Tonight the crescent Moon stands above Venus.
-
- JAN 28 -- THU
- *
-
- JAN 29 -- FRI
- Jupiter's moon Io disappears into eclipse by the planet's shadow around
- 11:53 p.m. EST, a little west of the planet. It reappears from behind
- Jupiter's east limb at 3:11 a.m. EST Saturday morning.
-
- JAN 30 -- SAT
- First quarter Moon (exact at 6:20 p.m. EST).
-
- ----- THIS WEEK'S PLANET ROUNDUP
-
- MERCURY is hidden in the glare of the Sun.
-
- VENUS blazes in the southwest as the bright "evening star" during and
- after dusk.
-
- MARS, orange and very bright, shines in Gemini near Castor and Pollux.
- Mars was at opposition January 7th. It's up in the east at dusk, shines
- high overhead in the middle of the night, and sets in the west before
- sunrise. In a telescope its disk has shrunk to 13 1/2 arc seconds wide.
-
- JUPITER, in Virgo, rises around 10:30 p.m. and shines well up in the
- east by midnight.
-
- SATURN is disappearing into the sunset.
-
- URANUS and NEPTUNE are hidden behind the glare of the Sun.
-
- PLUTO, extremely faint at 14th magnitude, is in the southeast before
- dawn.
-
- -----
- SKYLINE is not to be distributed or used for profit. Transcribed and
- provided with permission from Sky & Telescope Magazine.
- The SKYLINE voice report is provided as a public service by Sky &
- Telescope Magazine. SKYLINE is a voice recording on 617/497-4168.
- --
- Arlin B Collins Sun 24 Jan Sun Civil Naut Astro
- bcollins@utdallas.edu rise: 07:27 07:01 06:31 06:02
- lat N32.9 long W096.9 set: 17:52 18:19 18:48 19:18
-