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- From: bcollins@utdallas.edu (ARLIN B COLLINS)
- Subject: Sky&Telescope News Bulletin
- Message-ID: <BzMyLn.MMp@utdallas.edu>
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- Organization: Univ. of Texas at Dallas
- Date: Tue, 22 Dec 1992 00:56:10 GMT
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-
- ***
- Happy Holidays to all, and clear skies... abc
- ***
- SKY & TELESCOPE NEWS BULLETIN -- DECEMBER 19, 1992
-
- THE ASTEROID "TWO"-TATIS
- With all the news concerning the lunar eclipse and Galileo's flyby of
- the Earth these last two weeks, there hasn't been time to say much
- about a visit from a little asteroid called Toutatis. Only about 2
- kilometers across, 4179 Toutatis came within 2.2 million miles of us on
- December 8th, the closest flyby ever that was known about in advance.
- Professional observatories around the world have been homing in on the
- asteroid this past week. Perhaps the most interesting observations were
- made with radar, using the giant antennas in California and Puerto
- Rico. We haven't gotten a peek at the radar images yet, but
- investigator Steven Ostro has reportedly resolved many details.
- Remarkably, Toutatis is actually a contact binary, that is, two objects
- just barely joined together. This phenomenon was actually observed
- three years ago, when Ostro pinged another close-approaching asteroid
- designated 1989 PB. And he's also discovered that Toutatis rotates
- very, very slowly, with a synodic period of roughly nine days.
-
- COMET S-T SINKS IN THE WEST
- Comet Swift-Tuttle continues its plunge southward and this week crosses
- from Aquila into Sagittarius. To see it, you'll have to get out right
- after sunset and look low in the west -- the comet is only 30 degrees
- from the Sun. Here are positions for 0 hour Universal Time and equinox
- 2000 coordiantes:
-
- R.A. (2000) Dec.
- ================
- Dec 19 19h 45m -12.1 deg.
- Dec 21 19h 49m -13.5 deg.
- Dec 23 19h 53m -14.9 deg.
-
- ORION'S PROTOPLANETARY SWARM
- NASA's Hubble Space Telescope has uncovered the best evidence yet that
- planetary systems are common in the galaxy. Astronomers led by Robert
- O'Dell used the orbiting observatory to record the stellar nursery in
- the Orion nebula, where they found disks of gas and dust encircling 15
- young stars like the Sun. The mass of material in the disks is
- comparable to that in our own planetary system, and O'Dell thinks these
- disks will indeed give rise to planets over the next few million years.
- If he's right, it increases the odds that the Milky Way is already
- teeming with planets.
-
- ----- THIS WEEK'S "SKY AT A GLANCE"
-
- DEC 20 -- SUN
- *
-
- DEC 21 -- MON
- Venus and much fainter Saturn are in conjunction in the dusk. Saturn is
- 1 degree to Venus' upper right.
-
- The solstice is at 9:43 a.m. EST, marking the beginning of winter in
- the Northern Hemisphere, summer in the Southern.
-
- DEC 22 -- TUE
- Mars is 3 degrees south of Pollux.
-
- DEC 23 -- WED
- New Moon (exact at 7:43 p.m. Eastern standard time). Partial solar
- eclipse for the North Pacific and some surrounding lands. The Sun's
- disk will appear dented during or soon after sunrise in Japan, Korea,
- and parts of coastal China and Siberia on the 24th (local date); the
- Sun is partially eclipsed as it sets on the evening of the 23rd for
- southwestern Alaska, including Anchorage.
-
- DEC 24 -- THU
- Saturn's brightest moon Titan can be seen in a small telescope four
- ring lengths west of the planet.
-
- DEC 25 -- FRI
- Merry Sol Invictus. This Roman festival, the "Birthday of the
- Unconquered Sun," marked when the Sun, just past the solstice, began
- returning northward with the promise of bringing another spring and
- summer. The holiday eventually merged into Christianity as the date for
- Christmas.
-
- DEC 26 -- SAT
- *
-
- ----- THIS WEEK'S PLANET ROUNDUP
-
- MERCURY is barely above the east-southeastern horizon during dawn.
- Fainter Antares is to its right.
-
- VENUS blazes in the southwest as the bright "evening star" during and
- after evening twilight.
-
- MARS is in Gemini near the fainter stars Pollux and Castor, below them.
- It rises during twilight and shines high overhead by midnight. Mars is
- big and bright as it nears its January 7th opposition -- already it's
- about as big as it will get, 15 arc seconds across.
-
- JUPITER, in Virgo, rises around 1 a.m. and is the brightest "star" in
- the south at dawn.
-
- SATURN is the much fainter "star" close to Venus in the early evening.
- They're only a degree or two apart early in the week; conjunction 1
- degree apart comes on Monday the 21st. Later in the week Saturn moves
- to Venus' lower right.
-
- URANUS, NEPTUNE, and PLUTO are hidden behind the glare of the Sun.
-
- --
- 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 bcollins@utdallas.edu
-