W. HERSCHEL: [Observed 6 September 1793] A bright point, a little extended, like two points close to one another; as bright as a star of the 8.9 magnitude, surrounded by a very bright milky nebulosity suddenly terminated, having the appearance of a planetary nebula with a lucid center; the border however is not very well defined. It is perfectly round, and I suppose about half a minute in diameter. It is of a middle species, between the planetary nebulae and nebulous stars, and is a beautiful phenomenon. (Η IV-73)
~ The Caldwell Objects, Stephen James O''Meara
Technical details:
Optics: Vixen VC200L @ f/6.4
Mount: Skywatcher HEQ5 Synscan Pro (belt mod)
Guiding: ST-237 guide chip of SBIG ST2000XM
Camera: SBIG ST2000XM
Filter Wheel: SBIG CFW9
Filters: L
CCD Temperature: 0 degrees Celsius
Constellation: Cygnus
Date: Jul 18, 2021
Location: Korinthos - Greece - Albireo Observatory 1
Exposure:
L=12x300 sec bin 1x1
Calibration: Darks, Flats, Bias
Software:
Capturing/Calibration/Stacking: MaximDL
Processing: Pixinsight
No comments:
Post a Comment