Observation by David Swan: Surprising astrometry

Uploaded by

David Swan

Observer

David Swan

Observed

2018 Jun 15 - 22:41

Uploaded

2018 Jun 16 - 12:30

Objects

21P Giacobini-Zinner

Equipment

200mm SCT @ f/6.3
ASI183MM
Baader UV+IR cut
FireCapture, DeepSkyStacker and Astrometrica

Exposure

10 x 10s

Location

Tynemouth, UK

Target name

21P/Giacobini-Zinner

Title

Surprising astrometry

About this image

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.

Files associated with this observation

21pastrometry.png (1.1 MB)

Like this image

Jeremy Shears, Andy Wilson, Peter Carson

Comments

Nick James, 2018 Jun 17 - 08:01 UTC

Hi David,

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

Nick.

David Swan, 2018 Jun 17 - 09:24 UTC

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

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