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Astrometry: C/2017 T1 (Heinze)

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About this observation
Observer
David Swan
Time of observation
01/01/2018 - 21:00
Object
C/2017 T1 (Heinze)
Observing location
Tynemouth, UK
Equipment
200mm SCT @ f/6.3
ASI178MM
Baader UV+IR cut
FireCapture, DeepSkyStacker and Astrometrica
Exposure
3 x 5s
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Computer clock was sync'ed to time.nist.gov just prior to observing. I stacked three five-second frames centred on 21:00:08 UT on 01/01/2018. I astrometrically reduced the image and to my surprise found that the position of the object in my image was way off that predicted by the MPC (nearly two arcmin in RA and Dec). Fortunately, my position was much closer to that on the JPL Horizons website - so I'm less worried than I was. Also a major plus: I've completely solved the fixed pattern noise problem (horizontal bands gone!)

JPL Horizons, object at 21:00:00 - RA 07 18 45 Dec 49 17 09

DJS, object at 21:00:08 - RA 07 18 45 Dec 49 17 13

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