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M81/82 (UMa)
Click on the image for a larger version
| Date/Site: |
23. March, 1., 3. and 4. April 2021. Remote observatory on the AAR club's site in Presberg |
Exposure/
Filter: |
R: 18 x 300 seconds,
G: 19 x 300 seconds,
B: 17 x 300 seconds,
L: 74 x 300 seconds (-20°C) |
| Camera: |
Moravian G3-16200 with Astronomik Type II-filters |
Optics/
Instrument: |
250mm f/4,7 Newton with VIP-3010 Paracorr on 10Micron GM1000 HPS |
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Guiding: Lodestar attached to a 61mm-finder,
focusing: Microtouch and FocusMax,
data acquired remotely using CCD-Commander and MaximDL 6,
processing: MaximDL 6 and PixInsight 1.8 |
Deep images of the surroundings of M81 and M82 show a lot of Integrated Flux Nebula (IFN).
Apart from this signal the stacked data unfortunately showed a lot of strange spots and gradients. There was no reliable way to discern signal from bias, especially in this region of the sky. This presentation therefore restrains a bit concerning the background.
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© Friedhelm Hübner, last revision: 03.12.2023