HCG 57 and Arp 320
From DeepSkyPedia
| HCG 57 (catalog) | |
|---|---|
| Copeland's Septet •Arp 320 •CGCG 127.012 •[1] | |
| Members (8, 6)[1][2] | PGC 36010  NGC 3745 (15.2m) NGC 3751 (14.3m) NGC 3748 (14.6m) NGC 3754 (14.3m) NGC 3750 (14m) NGC 3746 (14.4m) NGC 3753 (13.7m) |
| Brightest member | NGC 3753 (13.7m) |
| Positionnote: [3] (epoch J2000) | |
| Constellation | Leo |
| Position | Ra 11:37:53.7 Dec +21:58:51 |
| DSS images | |
| Appearance | |
|
Please, help us find free binocular/telescope sketch or photo of this object | |
| Apparent mag. |
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| Size | 5.5 '
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| Other | |
| Notes | Arp 322: NGC 3753, NGC 3746, NGC 3750, NGC 3754, NGC 3748, NGC 3745 HCG 57: NGC 3753, NGC 3746, NGC 3750, NGC 3754, NGC 3748, NGC 3751, NGC 3745, PGC 36010 HCG 57 = Copeland's Septet |
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HCG 57 (Copeland's Septet, Hickson Compact Group 57) is a galaxy group in Leo.
Arp 320 galaxy group overlaps with HCG 57, the only difference being NGC 3751, on the southern edge of the group, that isn't member of Arp 320.
Also, some sources mention 8th member: 18m galaxy HCG 57H (PGC 36010) [2][4]
Contents |
[edit] How to find it
[edit] Appearance
[edit] Notes
[edit] References
- ↑ 1.0 1.1 Historic NGC and IC by Wolfgang Steinicke (version Nov. 20, 2006.)
- ↑ 2.0 2.1 HCG 57H map and page @ messier45.com
- ↑ Position of the brightest member
- ↑ 338arps.com: Arp 320
[edit] Links
-
HCG 57 observation and sketch by Jaakko Saloranta 
-
Hickson 57 observation by Tom Polakis with 10"
- Copeland's Septet observation and sketch with 10"/12.5"/16" by Martin Schoenball, Matthias Juchert, Uwe Glahn - Group character @ arpgalaxies.com
- HCG 57 observation with 13.1" f/4.5 reflector, 17.5" f/4.5 Newt, 17.5" f/4.4, 18" f/4.3 and 24" F/4.5 reflector by Michael Gille, Ray Cash, Steve Gottlieb, Randy Muller, Matt Orsie - Combined obs. notes of HCG Groups
- Copeland's Septet observation and sketch by David Erzeel @ deepskylog.be (with Obsession 15" UC (381 mm))
- Arp 320 observation with 16" at 262x by Bob Hill (Amarillo Astronomy Club) - Arp Galaxies: Springtime
- HCG 57 observation with 17.5" f/4 reflector by Jane Houston Jones (@observers.org)
- Copeland's Septet observation and sketch by Peter Henderickx @ deepskylog.be (with 22" Dobson (560 mm))
