Observation by Martin Mobberley: Comet 2017 T2 PanSTARRS approaching NGC ...

Uploaded by

Martin Mobberley

Observer

Martin Mobberley

Observed

2020 Jun 17 - 04:22

Uploaded

2020 Jun 17 - 09:20

Objects

NGC3953

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Constellation

Ursa Major

Field centre

RA: 11^h55^m
Dec: +52°47'
Position angle: +6°46'

Field size

1°30' × 2°14'

Title

Comet 2017 T2 PanSTARRS approaching NGC 3953 on June 17th

About this image

Another image with the itel New Mexico C11 RASA + ZWO colour camera.
2017 T2 approaching NGC 3953 in UMa. M109 & gamma UMa at the top.

Files associated with this observation

2017t2_20200617_0522_mpm.jpg (622.7 kB)

Like this image

Neil Morrison, Graham Winstanley, Jeremy Shears, Ray Emery, Andy Wilson, Nick James, Mr Michael Alan Frost, Peter Carson

Comments

Neil Morrison, 2020 Jun 17 - 11:06 UTC

Very interesting Image. Lots of background Galaxies visible but as in the previous image there is an artefact / refection of what appears to be the central obstruction on the corrector plate just above the very bright star in the top right corner.

Martin Mobberley, 2020 Jun 17 - 11:48 UTC

Yes, I left it in for educational purposes, as it illustrates nicely that the RASA design does have a weakness in this regard. There was a huge and unsightly sprawl of stray light in the south half of the frame too, again, internal reflections caused by gamma And. I decided to clone that one out because it looked like a huge, ghostly, ring nebula and was too ugly to leave in.

Of course, diffraction spikes are also artefacts, and some people even add them for artistic effect!

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