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Neptune (and Triton!)


Stub Mandrel

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I wasted hours last night getting loads of subs, mostly M31 that all came out very poor because the mist saturated the air with light pollution.

A few plus points - I did get to see M31 with my little 7x20 bins and the Pleiades were nice through the scope, I also discovered that if I use my small scope I can do unguided 2 minute subs no problem, but it vignettes very badly and my flats don't seem to have worked very well and I struggled to focus properly.

I started off, though using the bigger scope and managed to get a few decent subs of Neptune. I could only just make out nearby HIP111910 (HD 1214686), and cold not see Neptune in the grey sky. In the pictures it seems washed out. I used Stellarium and Astrometry.net toi make sure I had it.

I was about to post the pics when I saw someone else's thread about Triton from the night before. Zooming in to my pic andchecking with Stellarium, it turns out I got Triton on the opposite side of the planet. It's also interesting to see that Neptune moves quite a noticeable mount over 24 hours.

I'm well happy now! Time for some more processing, I think!

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it was only a small blue speck

You're not joking, it's tiny! I wasn't sure which was which until I had the photos. I made the background  blacker and rotated it so it matches the stellarium pic. there's a nice double star half way down as well:

Hmm doesn't want to rotate!

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I tried again last night, the clarity of the sky and seeing before it went cloudy at 12:00 was some of the best I've had at home. I could see bot M31 and M32 clear as a bell through the 9x finder scope.

The webcam was anon-starter for such a faint object, so I fetched the D10 and fitted it to my x2 barlow for the first time.

My problem was that combined with the reduced FOV I got two stars confused when trying to find Neptune so I took a few dozen subs of a pair of nearby stars, and one shot that might be Neptune, but I'm not 100% convinced. I had worked out it was 3/5 of the way to one star from another pair and went 3/5 of the way to a brighter star a bit further away instead.

The annoying thing is that this morning I set up a scope Stellarium with a focal length that gives 9X with my 25x eyepiece and managed to replicate what I was seeing - if I had done that last night I could have gone straight to it :-(

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I have had the good fortune of seeing Neptune. Having "found" it via GoTo

and video astronomy, I carefully replace the camera with an eyepiece.

Of course, two minutes later, I bumped the setup and... :o

It is certainly a striking and serene BLUE. But I do see the various

techniques of astrononomy as complimentary...

Or whatever works, basically? :p

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