NGC 4631 and NGC 4656 (CVn)

NGC 4631 and NGC 4656 (CVn)

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Date/Site: 26. March and 3. April 2022. Remote observatory on the AAR club's site in Presberg
Exposure/
Filter:
R: 24 x 300 seconds,
G: 18 x 300 seconds,
B: 17 x 300 seconds,
L: 67 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

These gravitationally disturbed starburst galaxies are known as „the whale“ and the „hockey stick“, or among the Munich deep-sky observers as „fish and fishhook“.
In a large Dobsonian telescope they are a pretty matching duo.
2016 at the ITV in Gedern I photographed with a mobilen setup to test how well the TMB-refractor of my local club fitted to my CCD-camera. Well: It did not harmonise very well.

NGC 4631/4656 (CVn)

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Date/Site: May 7. and 8., 2016, ITV, Gedern
Exposure/
Filter:
Lum 9 x 5 minutes,
red 9 x 5 minutes,
green 8 x 5 minutes,
blue 9 x 5 minutes (-20°C)
Camera: QSI 632 with SBIG- and Baader-filters
Optics/
Instrument:
4"-TMB refractor of the AAR on 10Micron GM1000 HPS
Guiding: Lodestar attached to a 61mm-finder,
focusing with USB_Focus and FocusMax,
automatic image acquisition with CCD-Commander and MaximDL 6,
calibration: MaximDL 6, processing: PixInsight 1.8

For the last night on the ITV I chose an object that I previously captured only in a very low quality.

© Friedhelm Hübner, last revision:  20.08.2022