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BAA Gallery Picture of the Week

103P/Hartley - Graham Relf

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About this observation
Observer
Graham Relf
Time of observation
04/10/2010 - 12:15

Hardware: Canon EOS 5D MkII, SkyWatcher 254mm f/4.8 Newtonian on HEQ5 mount (driven but not guided)Exposures: 32 x 30s ISO6400 2010-10-01 21:03:09-21:21:10 UTSoftware: GRIPThis image shows a comparison between two different ways of processing one set of 32 photos. On the left the photos have been shifted so that the comet stays in one position and then accumulated. That gives a proper view of the comet. On the right the stars have been merged, so the comet moves slightly in front of them. That makes it easier to identify the stars.The brightest star, just up and right from the comet, the only star showing diffraction spikes, is Tycho 3659 1253 1. Its V magnitude is 8.63. The brightest trail immediately to the right of the comet is Tycho 3659 1811 1, V magnitude 11.04.North is approximately at the top, east on the left.All processing was done in GRIP (GR's Image Processor)Graham Relf

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