Rodd Posted June 6, 2019 Share Posted June 6, 2019 Here's the second half of my rare night of clear skies. At 12:30 I had to retire (work is not fun without sleep). But I could not squander such conditions. Despite the low position in the south, I could see all of the scorpions tail--a very rare occurrence indeed for me. M20 was close behind, so I found it and left the rig running while I slept. The problem with this method is FWHM tends to creep up as the night progresses--probably due to focus shift. But the low position in the sky accounted for some--my initial FWHM values were 0.75 arcsec/pix higher than they were for M13--and focus was solid. My temperature compensation model is not perfect--so by 4:00 FWHM had crept up to nearly 4. Despite the less than stellar FWHM (no pun anticipated--but intended none the less) I used nearly all the subs up until about 3:30 for this stack. There is only a slightly noticeable difference between the stack of 9 and the stack of 29--but a little goes a long way. But I guess its not too bad for a color channel--red TOA 130 with ASI 1600 Red: 29 300 sec 8 Link to comment Share on other sites More sharing options...
Demonperformer Posted June 6, 2019 Share Posted June 6, 2019 Very nice. I'm hoping to have a go at some of the Sgr nebulae this year (if I ever get a clear sky of an available night!). Link to comment Share on other sites More sharing options...
Rodd Posted June 6, 2019 Author Share Posted June 6, 2019 8 hours ago, Demonperformer said: Very nice. I'm hoping to have a go at some of the Sgr nebulae this year (if I ever get a clear sky of an available night!). Thanks DP. Its a tough area for me--never higher than about 35 degrees, and even when its clear its usually in New Haven's light dome. Late night is best-from highest elevation toward the west. I hope to be able to finish it (and supplant some of this data with tighter data!) Rodd Link to comment Share on other sites More sharing options...
Demonperformer Posted June 6, 2019 Share Posted June 6, 2019 35 degrees ... I wish! 17-18 here. Link to comment Share on other sites More sharing options...
Rodd Posted June 6, 2019 Author Share Posted June 6, 2019 37 minutes ago, Demonperformer said: 35 degrees ... I wish! 17-18 here. Wow--that's bad. That's about where I start. I can't imagine starting lower and having 17-18 be the highest. That sure makes collecting 20 hours of data a challenge! Rodd Link to comment Share on other sites More sharing options...
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