back M 81

Object: M 81 Galaxy
Imager: Dipl.-Ing. Johannes Huwe
Date & Location: 6. april 2003, NMSkies
Optics / Telescope: Celestron C14 SCT, SBIG ST1001E
Focal length f/ratio: 3910 mm @ f10 (no guiding)
Exposure: 32 min total, LRGB
L = 8 (2x4) min, binning 2x2
R = 8 (2x4) min, binning 2x2
G = 8 (2x4) min, binning 2x2
B = 8 (2x4) min, binning 2x2
Software: Camera control and image reduction with CCDSoft, RGB Combine in MaxIm DL, processed with Photoshop
Comments: Image Preview - Image prozessing not finished.
Conditions: Extrem windy (8-25 mph).
Object Info: The distance of M81 is about 12 million light years and it has a linear diameter of over 70.000 light years. Apparent Dimension 21x10 arc min.