photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Derek Santiago | all galleries >> Galleries >> Published Images > Chaple's Arc HaLRGB
previous | next

Chaple's Arc HaLRGB

Chaple's Arc is a mini asterism described by Glenn Chaple in 1980 while looking for the colorful double star HJ 1470 in Cygnus. It is a nearly circular arrangements of mostly double stars. HJ 1470 is seen at 1 o'clock. Its star pair are mag 7.4 and 9.2 The ring has a 22 arc-minute diameter and so barely fit in my original FOV. This re shoot is with the new 0.7 focal reducer for the 9.25 Edge. Three hours Ha added.

Imaging Camera: QSI640wsg
Imaging Scope: Celestron 9.25"Edge HD at f/7
Guide Camera: SX Lodestarx2
Mount: Avalon M-Uno Fast Reverse
Filters: Astrodon Gen II LRGB
Exposure: 90 min Lum, 1 minute subs unbinned, 45 min each RGB, 1 minute subs unbinned, 180 min
Ha, 30 min subs binx2
Capture: APT
Processing: CCD Stack and PS CC
Date: Aug 4, 2018
Sky conditions: average seeing
Location: My front driveway. Morristown, NJ

Published in December, 2018 issue of Astronomy Magazine, p. 72.

other sizes: small medium large original auto
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment