NGC 7635


NGC 7635 – The Bubble Nebula

 

Date/time: 28.09.2008 20:12 to 28.09.2008 22:20
Az./Alt. positions: 48° / 61° to 31° / 75°
Ambient conditions: 5°C, transparency 3/5, seeing 3/5, high clouds
Location: Trier, Germany

Equipment:
Telescope: Celestron C8 at f/7.3 with JMI focuser
Flattener: Alan Gee with 2 spacers in front of the camera
Mount: CGE, selfguided with ST-4000XCM
Camera: SBIG ST-4000XCM

Acquisition:
Software: CCDSoft V5
FOV, Image scale: 35.6 x 35.6 arcmin, 1.03 arcs/pixel
Sub-exposures: 2h 2min (12 x 610s) light frames at –25°C
50 x 610s dark frames, 16 x 0.1s light box flat frames at –15°C
50 bias at –15°C for flat calibration

Processing:
Flats normalized in CCDSoft, bias calibrated and stacked in IP 3.0, calibration, stacking,
high/low pixel reduction  in Images Plus 3.0,stretching, curves and levels adjustments of
single channels and final tweaking in CS3.

Comments:
The Alan Gee has to be connected directly on the camera, otherwise no focus is obtained.
It means no filter can be used. Due to the high light pollution typical at my place much
processing of the background was necessary. After so much struggling to image with the C8,
at this point I decided, this would be one of the last photos with this telescope.



Download full size image:

Filename: nebulae/ngc7635_2008-09-28_full.jpg
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