Glowing
much brighter than expected, Comet Lemmon (C/2012 F6) is gliding through the
skies of the southern hemisphere about 92 million miles (0.99 AU) from Earth.
Amateur astronomer Rolf Wahl Olsen sends this picture from his backyard in
Auckland, New Zealand:
 |
| Comet Lemmon |
"I
took this image of Comet Lemmon on the 28th of January," says Olsen.
"It has become quite bright now and has also grown a beautiful tail."
Discovered
on March 23rd 2012 by the Mount Lemmon survey in Arizona, Comet Lemmon is on an
elliptical orbit with a period of almost 11,000 years. This is its first visit
to the inner solar system in a very long time. The comet is brightening as it
approaches the sun; light curves suggest that it will reach 2nd or 3rd
magnitude, similar to the stars in the Big Dipper, in late March when it
approaches the sun at about the same distance as Venus (0.7 AU).
At
the moment, the comet is glowing like a 7th magnitude star, just below the
limit of naked-eye visibility. To capture the faint details of the comet's
filamentary tail, Olsen used a 10-inch telescope, a sensitive CCD camera, and
an exposure time of 1 hour 17 minutes. Complete photo details are given here.
Lemmon's
green color comes from the gases that make up its coma. Jets spewing from the
comet's nucleus contain cyanogen (CN: a poisonous gas found in many comets) and
diatomic carbon (C2). Both substances glow green when illuminated by
sunlight in the near-vacuum of space.
Northern
hemisphere observers will get their first good look at the comet in early
April; until then it is a target exclusively for astronomers in the southern
hemisphere.
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