Photograph of C/2007 W1 (Boattini)
I observed C/2007 W1 (Boattini), which has begun appearing
in Cetus in the predawn sky. At a glance the coma appears very bright and
firm, but the tail may be very faint or non-existent. This photograph was
taken by our new 70cm reflector. Unlike the previous 60cm reflector, this
70cm telescope tracks the comet's motion automatically, which makes observation
easier. As there is no drift of the star image, the position can be majored
accurately. This comet will rise higher and become easier to observe. The
photographic magnitude of the nucleus is 9 and rather faint, but visually
it is 7th magnitude with the coma diameter measuring more than 5 minutes
of arc. I will advise comet searchers to be cautious about misidentifying
it as a new comet.
@C/2007 W1 (Boattini)
13-minute exposure from 3:45 J.S.T. on July 16, 2008
70cm f/6 reflector, TMY400film