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- From: bcollins@utdallas.edu (ARLIN B COLLINS)
- Subject: Sky&Tel Weekly News Bulletin
- Message-ID: <By6IGI.BA@utdallas.edu>
- Sender: usenet@utdallas.edu
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- Organization: Univ. of Texas at Dallas
- Date: Mon, 23 Nov 1992 17:12:17 GMT
- Lines: 60
-
- if you are in the US, have a happy and safe Thanksgiving,
- if you are not, then, have a happy and save Nov 26-29. B-{)
-
- SKY & TELESCOPE NEWS BULLETIN
- NOVEMBER 21, 1992
-
- GLIMPSING SWIFT-TUTTLE
- If for some reason you've put off trying to find Comet Swift-Tuttle,
- you'd best get outside this week. For starters, while the comet doesn't
- reach perihelion until December 12th, it has already started moving
- away from Earth. In fact, Swift-Tuttle is predicted to be its brightest
- right now, perhaps just at 5th magnitude. Second, the Moon is
- completely out of the way now but will return as a thin crescent by
- Thanksgiving weekend. Third, the comet is making a beeline for southern
- skies and will be virtually unobservable this time next month. And,
- fourth, it's sporting a short tail. With binoculars, Californian
- Charles Morris saw one 2 degrees long on the 13th, and Dan Costanzo of
- the National Capitol Astronomers in Washington saw a one-degree tail on
- November 17th through an 8-inch telescope. But both observers had very
- dark sites, and the tail may not be obvious if light pollution is bad
- in your area.
-
- So, what are you waiting for? Comet Swift-Tuttle, the source of the
- Perseid meteors, only visits the inner solar system once every 130
- years. It's now or never. This celestial interloper is currently
- visible in the evening sky for a few hours after sunset. If you have
- exceptionally dark skies the comet is technically a naked-eye object,
- but binoculars will make finding it much easier. I'll give coordinates
- in a second, but imagine the famed Summer Triangle of stars for a
- moment as a kite, with Vega and Altair forming the side tips and Deneb
- the bottom. Right now Swift-Tuttle is just about where you'd expect to
- find the top corner of the kite. Here are equinox 2000 coordinates for
- 0 hour Universal time, which corresponds to the previous evening at 7
- p.m. on the East Coast and 4 p.m. in the West.
-
- R.A. (2000) Dec.
- ================
- Nov. 21 18h 27m +16.2 deg.
- Nov. 23 18h 34m +13.6 deg.
- Nov. 25 18h 42m +11.1 deg.
- Nov. 27 18h 48m +08.7 deg.
-
- THE MOST DISTANT STAR
- A new and very distant supernova made the news late last week. An
- international team of astronomers discovered the 22nd-magnitude star
- last April and May in an anonymous galaxy in Hercules. The discovery,
- designated 1992bi, was made with the 2.5-meter Isaac Newton telescope
- in the Canary Islands. Its host galaxy has a redshift of 0.457, which
- means the supernova's light reached us after traveling for some 5
- billion years. The importance of this supernova is that the rise and
- fall in the light from the blast can be correlated very closely with
- its true, or absolute, brightness. This in turn will give astronomers a
- very accurate yardstick to a very distant object.
- -----
- SkyLine is provided by the publishers of "Sky & Telescope" magazine.
- It may not be used for profit. It is released via "go astroforum" on
- CompuServe.
-
- --
- Arlin B Collins CompuServe: INTERNET:bcollins@utdallas.edu :-)
-