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NGC 3718, NGC 3729 and Hickson 56 (UMa)
Click on the image for a larger version
| Date/Site: |
7. and 19. March 2021. Remote observatory on the AAR club's site in Presberg |
Exposure/
Filter: |
R: 22 x 300 seconds,
G: 18 x 300 seconds,
B: 16 x 300 seconds,
L: 26 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 |
This group of galaxies is one of my favourites. The tidally deformed galaxies in a distance of 56 million lightyears correspond dramatically with the interacting galaxies of the compact Hickson 56-group, which is 350 million lightyears distant.
Several years ago I imaged this group with totally different instruments:
NGC 3729/3718 (UMa)
Click on the image for a larger version
| Date/Site: |
April 1. and 20., 2009, AAR-observatory in Presberg |
Exposure/
Filter: |
Luminance 12 x 5 minutes (-20°C) with 13"-Newton,
RGB 6 x 5 minutes (-25°C) with 6"-Newton |
| Camera: |
SBIG ST10XME, motorized Atik-filterwheel with Astronomik-RGB-filters |
Optics/
Instrument: |
13"-Newton and 6"-Newton, Baader coma-corrector |
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focusing with RoboFocus and MaximDL |
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flatfielding, darks, deblooming, alignment and stacking: MaximDL
levels and curves: Photoshop CS |
Remarks: 5.5 mag-sky, dry, no wind, +3.5°C (1.4.) and +12°C (20.4.) with hight humidity.
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© Friedhelm Hübner, last revision: 03.12.2023