SH2-171 HOO (Simon)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7762 · NGC 7822

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SH2-171 HOO

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SH2-171 HOO

I managed to get the OIII data for SH2-171, before the weather changed, and whilst it was on a bad night with high murk and wispy stuff, I am pleased to have obtained what I have. When I was at University, many people would refer to 'my stories!' Well here is another one of Simon's stories, just for you...

As you know, I managed to get the Ha data for this the other night, and then when it came to obtaining the OIII data, I came across a problem. As many you are aware, I manually align the FOV; I do not use plate solving. Boo hiss! Normally it works quite well, I choose three stars in a given FOV, and then use those as my markers for the next time I image the object, so everything is lined up. But it did not work out as planned this time!

I spent ages trying to line things up, and it was so much more difficult than normal, because the OIII data is much fainter, too. I could not work out why I could not do it. I finally realised that the FOV was at right angles to my original image! But why? I could not fathom it because the camera was in the same place as the time before. Anyway, I settled for the orientation I had, because I no longer had the will power to be bothered to change it, and decided to use what I would get for the processing. The next day it suddenly hit me! I had taken out a 0.2mm spacer to see if I could improve on the stars - which I did not! - and it was that minor change that had altered the orientation by about 90 degrees - so the camera wasn't in the same place as I thought it was!

As that is so, I ended up with a different FOV compared to the Ha version of this, because I had to crop it down to fit it together nicely. So, this is why I have what I have. At least I got a picture! Thanks everyone.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Basic success
Started	...
Astrometry.net job	8578507
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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