M81 - Bode's Galaxy - monochrome

Page published 2015-06

M81, “Bode’s Galaxy”. Taken as a test after adjusting guiding and periodic error correction. (Still shows some star distortion from scope needing collimation fine-tuned.)

Exposure

Luminance: 30 min (6 × 5-min)

binned 2 × 2
1.37 arc-sec per pixel

Camera

QSI583WSG

3348 x 2574 pixels of 5.4 µm

Temperature

Ambient 20° C

Chip -15° C

Telescope

AT8RC

1625mm f/l, f/8

Mount

Paramount MX+

Guiding

Lodestar

Processing

Darks
Flats
CCDStack
GradientXterminator, Photoshop

32 × 15 minutes (scaled)
32
Median combine