NGC 7757
| Galaxy NGC 7757 |
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|---|---|
![NGC 7757 [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC7757_-_SDSS_DR14.jpg)
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| NGC 7757 SDSS Recording | |
| AladinLite | |
| Constellation | fishes |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 23 h 48 m 45.52 s |
| declination | + 04 ° 10 ′ 16.1 ″ |
| Appearance | |
| Morphological type | SA (rs) c |
| Brightness (visual) | 12.4 mag |
| Brightness (B-band) | 13.1 mag |
| Angular expansion | 2.4 ′ × 1.7 ′ |
| Position angle | 115 ° |
| Surface brightness | 13.8 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 7757 group LGG 482 |
| Redshift | 0.009860 ± 0.000007 |
| Radial velocity | (2956 ± 2) km / s |
|
Stroke distance v rad / H 0 |
(138 ± 10) x 10 6 ly (42.2 ± 3.0) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | September 24, 1830 |
| Catalog names | |
| NGC 7757 • UGC 12788 • PGC 72491 • CGCG 407-059 • MCG + 01-60-037 • 2MASX J23484552 + 041015 • Arp 68 • VV 407 • HIPASS J2348 + 04 • WISEA J234845.51 + 041016.6 • HOLM 817A | |
NGC 7757 = Arp 68 is a spiral galaxy of the Hubble type SA (rs) c in the constellation Pisces on the ecliptic . It is estimated to be 138 million light years away from the Milky Way and about 95,000 light years in diameter.
In the same area of the sky is u. a. the galaxy NGC 7750 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with a small companion of high surface brightness on one arm (Arp catalog) .
The object was discovered by John Herschel on September 24, 1830 .
NGC 7757 group ( LGG 482 )
| Galaxy | Alternative name | Distance / million ly |
|---|---|---|
| NGC 7731 | PGC 72128 | 135 |
| NGC 7732 | PGC 72131 | 136 |
| NGC 7750 | PGC 72367 | 137 |
| NGC 7757 | PGC 72491 | 138 |
| NGC 7756 | PGC 72493 | ? |
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7
Web links
Commons : NGC 7757 - collection of images, videos, and audio files
