COPYRIGHT, PLEASE NOTE
All the material on this website is copyrighted to J-P Metsavainio, if not otherwise stated. Any content on this website may not be reproduced without the author’s permission.
Monday, February 9, 2015
I managed to collect some lights for this object between 19.01 - 08.02. 2015. The transparency was poor at all nights and speeding clouds interrupted the imaging session way too soon. Altogether I collected only four hours of H-a and two hours of O-III.
Abell 85 (CTB1)
SNR G116.9+00.1 in constellation Cassiopeia
Oxygen and Hydrogen (O-III and H-alpha)
An experimental starless photo shows the actual SNR better
The supernova remnant in H-alpha light alone
Abell 85 is a very faint supernova remnant in constellation Cassiopeia. It's difficult to image with any details due to extremely low surface brightness. Abell 85 has a largish diameter, about half a degree, it has a same apparent diameter as a full Moon. The physical diameter is about 98 light years across. This SNR locates about 9800 light years from the Earth. CTB1 was originally thought to be a planetary nebula and it was included the Abell catalog of planetary nebulae under a name Abell 85. It was confirmed to be a supernova remnant by Willis & Dickel at 1971.
Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2
Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
H-alpha, 12 x 1200s binned 2x2 = 4h
O-II, 6 x 1200s bined 4x4 = 2h