|Stack of 79 light frames 1.3 sec each, 300mm, f/5.6, ISO 1600 (30 dark, 20 bias)|
I used a chart from the American Association of Variable Star Observers (AAVSO) to identify the magnitudes of several other stars in my image, then tried to place N Del 2013 on a spectrum between them. This process is described in more detail here.
As it so happens, my guess of 5.6 plots perfectly on the AAVSO light curve for N Del 2013. Indiana time is 4 hours behind UTC, and I took my photos at 10:30pm on August 21 - so that puts me smack dab in the middle of the green dots just after midnight UTC on August 22.
|A wider shot of Nova Delphini 2013 showing location relative to Delphinus|
21 subs, 19 darks each at 75mm, f/4.5, 4 sec, ISO 1600