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Tuesday, November 26, 2013


Comet C/2012 S1 ISON, more tail action in H1A (23 November, 2013)

Comet C/2012 S1 ISON in medium resolution PNG images from STEREO H1A on 23 November. No processing. Click to embiggen25 images stacked and animated using ImageJ, no other processing. Click to embiggen (warning about 14 Mb file). If you look hard you can see 2P/Enke.

Comet ISON in medium resolution PNG images from STEREO H1A,while more detailed than the beacon images, they are somewhat limited for analysis, using 38Ari, Lambda Ceti, Mu Ceti and Xi Tau (O Tau that I used for the images from the 21st is behind the label), the comet stars of around magnitude 2.7 (this is probably fainter than it actually is due to the CCD response of H1A and pixel saturation in the processed PNG), and the comet brightening by 0.5 magnitudes over the course of the day.

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