Observation by Grant Privett: Medusa Nebula

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Grant Privett


Grant Privett


2022 Feb 06 - 22:30


2022 Feb 09 - 22:27


Abell 21

  • 300mm f/4 Newtonian

210x 20s


Near Salisbury

Target name

Medusa Nebula


Medusa Nebula

About this image

Yes, I know the collimation is awful and the flat fielding is wrong somehow (not sure why), but as the coma corrector-CCD distance is 10mm wrong those are the least of my worries and I will not panic about them unduly. Will sort out the collimation and start doing long exposures again when the RCC turns up. 

Either way, I was expecting Abell 21 to be slightly tougher, but it is a rather nice target anyway. Even single images were showing some detail. I must try some of the others again. I remember a few being really pretty.

At least I tracked down the dome earthing problem.


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Mike Harlow
Mike Harlow, 2022 Feb 10 - 15:25 UTC

Looks good to me Grant.  And at least 3 asteroids as well...

(However...South up!!!)


Grant Privett
Grant Privett, 2022 Feb 10 - 17:53 UTC

Well done in spotting 3 asteroids!

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