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NGC 4631 and NGC 4656 (CVn)
Click on the image for a larger version
| 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 |
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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)
Click on the image for a larger version
| 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 |
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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:
NGC 4631 (CVn)
Click on the image for a larger version
| Date/Site: |
March 7., 2010, AAR-observatory in Presberg |
Exposure/
Filter: |
L: 6 x 5 minutes,
RGB 3 x 5 minutes, binned 2x2 (-25°C) |
| Camera: |
SBIG ST10XME with CFW9 and SBIG LRGB-filters |
Optics/
Instrument: |
26cm-Newton on Gemini 41 Observatory |
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Focusing with Robofocus |
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Darks, flats, deblooming, alignment and stacking: MaximDL 5,
Levels and curves: Photoshop CS3. |
The first LRGB with the new filterwheel.
The seamless interation of hard- and software was a pleasant surprise compared to the previous setup.
In my eyes there is no obvious gain in binning the exposures of the colour-frames. I have the impression that the overall resolution deteriorates. I am pretty sure this will remain the only LRGB with this method.
I had a hard time to find a suitable star to guide on, so the „fish“ was not placed on the sweet spot of the optics and the camera.
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