april 1st comet
APRIL 1ST COMET FLYBY: Green
comet 41P/Tuttle-Giacobini-Kresak is flying over Earth's North Pole
this week where sky watchers can find it all night long not far from the
bowl of the Big Dipper. At closest approach on April 1st it will be
just 21 million km from Earth--an easy target for backyard telescopes
and almost visible to the naked eye. Amateur astronomer Yasushi Aoshima
sends this picture of the approaching comet from Fukushima, Japan:
"On March 22nd I caught 41P 'eating' M108,
the Surfboard Galaxy," says Aoshima. "The comet's green atmosphere
appeared to swallow the distant spiral galaxy as it exited Ursa Major."
Why green? Like many
comets, 41P has a verdant hue because its atmosphere contains diatomic
carbon (C2)--a substance that glows green in the near vacuum of space.
Comet 41P is not only
approaching Earth, but also the sun. April 12th is the date of
perihelion (minimum distance from the sun). This means we are catching
the comet just as solar heating is furiously searing its icy core. The
green atmosphere should be well puffed up by streamers of vaporizing
gas. Optimistic estimates of the comet's brightness place it at magnitude +6, near the lower limit of naked-eye visibility.
This is not a Great Comet,
but it should be a good one. The best time to observe is during the
dark hours before sunrise when the green fuzzball is high in the
northern sky. If you have a GOTO telescope, you can point it using an ephemeris from the Minor Planet Center. These sky maps show approximately where to look: March 31, April 1, 2.
Realtime
Comet Photo Galleryhttp://spaceweather.com/
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