NGC 6811 (Cyg)

NGC 6811 (Cyg)

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Date/Site: 5. and 11. July 2022. Remote observatory on the AAR club's site in Presberg
Exposure/
Filter:
R: 12 x 300 seconds,
G: 12 x 300 seconds,
B: 12 x 300 seconds,
L: 48 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
Guiding: ASI120 attached to a 61mm-finder,
focusing: Microtouch and FocusMax,
data acquired remotely using CCD-Commander, PHD_Broker with PHD2/multistar-guiding and MaximDL 6,
processing: MaximDL 6 and PixInsight 1.8

The open cluster NGC 6811 is situated in the northeastern wing of the swan, not far from Delta Cygni. A „hole“ in the cluster is not discernible in this image; but the cluster is almost drowned by the many stars in this part of the milkyway.
Capturing the frames for this image was part of an experiment: Some astrophotographers produce impressive images from the center of large cities or from the middle of the industrial Ruhr-area, without a major impact of the heavy light-pollution on the quality of their results. So I ignored the increasingly annoying moon while exposing. In fact moonlight was not so much a problem but cirrus-clouds, producing haloes around the brighter stars.

© Friedhelm Hübner, last revision:  20.08.2022