NGC 772
| Galaxy NGC 772 |
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|---|---|
|
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| NGC 772, imaged with the Liverpool telescope . | |
| AladinLite | |
| Constellation | Aries |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 59 m 19.6 s |
| declination | + 19 ° 00 ′ 27 ″ |
| Appearance | |
| Morphological type | SA (s) b HII |
| Brightness (visual) | 10.3 mag |
| Brightness (B-band) | 11.1 mag |
| Angular expansion | 7.2 ′ × 4.3 ′ |
| Position angle | 130 ° |
| Surface brightness | 13.9 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 40 |
| Redshift | 0.008246 ± 0.000010 |
| Radial velocity | (2472 ± 3) km / s |
|
Stroke distance v rad / H 0 |
(114 ± 8) x 10 6 ly (35.1 ± 2.5) Mpc |
| diameter | approx. 220,000 ly |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | November 29, 1785 |
| Catalog names | |
| NGC 772 • UGC 1466 • PGC 7525 • CGCG 461-018 • MCG + 03-06-011 • IRAS 01565 + 1845 • Arp 78 • GC 463 • H I 112 • h 181 • HIPASS J0159 + 18 • Kara 80 | |
NGC 772 is the name of a spiral galaxy of type Sb in the constellation Aries . It is around 114 million light years away from the Milky Way and has a diameter of around 240,000 light years.
The elliptical galaxy NGC 770 is a satellite galaxy of NGC 772; it interacts with the latter and is responsible for the deformation of one of its spiral arms and the " starburst " that takes place in it . This dwarf galaxy has now reached a projected distance of almost 100,000 light years from its companion. The two galaxies are listed together as Arp 78 in the Arp catalog . 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) .
NGC 772 was discovered by Friedrich Wilhelm Herschel on November 29, 1785 .
Amateur picture of NGC 772 with SN 2003hl and SN 2003iq as well as the asteroid (6223) Dahl
High-resolution image of the center, created using the Hubble Space Telescope
NGC 772 group ( LGG 40 )
| Galaxy | Alternative name | Distance / million Lj |
|---|---|---|
| NGC 772 | PGC 7525 | 114 |
| NGC 770 | PGC 7517 | 118 |
| PGC 7826 | UGC 1546 | 110 |
| PGC 7750 | UGC 1519 | 109 |
Web links
- High-resolution image of the galaxy from an amateur observatory with a semi-professional telescope
- Arp 78 in APOD July 7, 2011
- Spektrum.de : Amateur recordings [1]
- ARP ATLAS OF PECULIAR GALAXIES
- Seligman Arp
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