Sky & Telescope's News Bulletin - Mar 25
From: SJG (stuartgoldman_at_gmail.com)
Date: 03/26/05
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Date: 25 Mar 2005 21:00:21 -0800
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* * * SKY & TELESCOPE's WEEKLY NEWS BULLETIN - March 25, 2005 * * *
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Welcome to S&T's Weekly News Bulletin. Images, the full text of stories
abridged here, and other enhancements are available on our Web site,
SkyandTelescope.com, at the URLs provided below. (If the links don't
work, just manually type the URLs into your Web browser.) Clear skies!
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HALE-BOPP: THE COMET THAT DOESN'T QUIT
Eight years after Comet Hale-Bopp dazzled the world as it passed
through the inner solar system, the dirty snowball is still detectable
(about 20th magnitude) despite being a whopping 21 astronomical units
from the Sun. On January 8th MIT astronomers Andrew S. Rivkin and
Richard P. Binzel observed the comet with Magellan Observatory's
6.5-meter Clay telescope in Chile.
Rivkin and Binzel were aiming for a "Goldilocks" observing moment --
the comet would have cooled off, the coma would be gone, and yet the
nucleus would still be bright enough to observe. "There's not a lot of
spectra of the nuclei of comets," says Rivkin. They are hard to capture
because the nuclei are obscured once comets develop comas. They didn't
find what they bargained for....
> http://SkyandTelescope.com/news/article_1486_1.asp
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EXOPLANETS: THE HEAT IS ON
For the first time ever, astronomers have detected infrared light from
objects that everyone agrees are extrasolar planets. Using the Spitzer
Space Telescope, two teams independently picked up infrared light
emitted by the "hot Jupiters" TrES-1 and HD 209458b, which transit
their host stars periodically. These observations have yielded precious
information about both planets. But they also present a mystery: why is
HD 209458b puffed up....?
> http://SkyandTelescope.com/news/article_1485_1.asp
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HIGHLIGHTS OF THIS WEEK'S SKY
* Full Moon on Friday, March 25th.
* Saturn (magnitude +0.1, in Gemini) shines brightly very high in the
southwest during evening, near Castor and Pollux -- excellently placed
for telescopic viewing.
* Jupiter (a bright magnitude -2.5, in Virgo) rises in the east around
sunset, shines highest in the south in the middle of the night, and
sets in the west around sunrise.
For more, see This Week's Sky at a Glance and Planet Roundup:
> http://SkyandTelescope.com/observing/ataglance
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Stuart Goldman sgoldman@SkyandTelescope.com
Associate Editor http://SkyandTelescope.com
Sky & Telescope http://NightSkyMag.com
49 Bay State Rd.
Cambridge, MA 02138
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