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NGC 7331 et al. (Peg)
Click on the image for a larger version
| Date/Site: |
13. October and 13. November 2020. Remote observatory on the AAR club's site in Presberg |
Exposure/
Filter: |
R: 34 x 180 seconds,
G: 30 x 180 seconds,
B: 29 x 180 seconds,
L: 33 x 180 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 5,
calibration and processing: PixInsight 1.8 |
With the new configuration my favourite galaxy-group had to be imaged as well.
The background of the image is a bit flaky and blotchy; some of it sure is real signal from the Integrated Flux Nebula (IFN) in this area. On the other hand some spots seem to be processing artefacts. Therefore an image with a controlled darker background is presented here.
Half a degree southwest of NGC 7331 lies the compact galaxy-group "Stephan's Quintett" containing NGC 7318 and 7320, which I imaged close up not so long ago.
And some earlier attempts at this object:
NGC 7331 et al. (Peg)
Click on the image for a larger version
| Date/Site: |
5. September 2018. Remote observatory on the AAR club's site in Presberg |
Exposure/
Filter: |
R: 9 x 300 seconds,
G: 13 x 300 seconds,
B: 15 x 300 seconds (-20°C) |
| Camera: |
QSI 632 with Astronomik Type II-Filters |
Optics/
Instrument: |
250mm f/4 Newton with Baader RCC1 on 10Micron GM1000 HPS |
|
Guiding: Lodestar attached to a 61mm-finder,
focusing with Microtouch and FocusMax,
data acquired remotely using CCD-Commander and MaximDL 6,
calibration: MaximDL 6, processing: PixInsight 1.8 |
Every now and then I come back to this wonderful group of galaxies.
NGC 7331 (Peg)
Click on the image for a larger version
| Date/Site: |
August 16., 2009, AAR-observatory in Presberg |
Exposure/
Filter: |
L: 6 x 6, R: 6 x 6, G: 7 x 6, B: 7 x 6 minutes (-12°C) |
| Camera: |
SBIG ST10XME, motorized Atik-filterwheel with Astronomik-RGB-filters |
Optics/
Instrument: |
13"-Newton on the Gemini 41 Observatory mount, Baader coma-corrector |
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focusing with RoboFocus and MaximDL,;
deblooming, flats, darks, alignment and stacking: MaximDL,
levels and curves: Photoshop CS |
In a warm midsummer-night in August 2009 a last attempt for a LRGB with the 13" was made. So this probably is the last image with the 13", because without reworking the mirror seriously there seems to be no way to get really good results with it.
In the beginning the headlights of the farmer plowing the adjacent field in the middle of the night interfered and in the end the break of dawn ruined the last image.
And this was the first test of the same object with the 26cm-Newton:
NGC 7331 (Peg)
Click on the image for a larger version
| Date/Site: |
October 26., 2009, Presberg |
Exposure/
Filter: |
Luminance 3 x 5 minutes (-20°C) |
| Camera: |
SBIG ST10XME |
Optics/
Instrument: |
26cm-Newton on Gemini 41 Observatory mount, 1.6 x Barlow (f8) |
|
focusing by hand,
darks, alignment and stacking: MaximDL 4.6.
levels and curves: Photoshop CS |
NGC 7331 et al. (Peg)
Click on the image for a larger version
| Date/Site: |
August 31., 2008, AAR-observatory in Presberg |
Exposure/
Filter: |
L: 6 x 10 minutes
RGB: 3 x 5 minutes, 2x2 Binning (-15°) |
| Camera: |
SBIG ST10XME, motorized Atik-filterwheel with Astronomik-RGB-filters |
Optics/
Instrument: |
6"-Newton on the Gemini 41 Observatory mount, Baader coma-corrector |
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focusing by hand with the aid of MaximDL 4.6 |
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Deblooming, darks, alignment and stacking: MaximDL,
levels and curves: Photoshop CS |
Remarks: first LRGB with the new ST10; the reflector wasn't properly collimated, I promise to take care next time.
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