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Surprising astrometry

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About this observation
Observer
David Swan
Time of observation
15/06/2018 - 23:41
Object
21P/Giacobini-Zinner
Observing location
Tynemouth, UK
Equipment
200mm SCT @ f/6.3
ASI183MM
Baader UV+IR cut
FireCapture, DeepSkyStacker and Astrometrica
Exposure
10 x 10s
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Oddly my determination of the object's position is way off (>2min RA) the MPC prediction, but pretty much spot on with the JPL Horizons prediction.

Comments

nickjames's picture

Hi David,

When was the last time you updated your MPC elements? 21P is pretty much spot on now.

Nick.

djswan2002's picture

Thanks Nick. Downloaded MPCOrb via Internet menu: dRA and dDec are now both 0.0' when I click object designation!

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