NGC 3445
| Galaxy NGC 3445 |
|
|---|---|
|
|
| SDSS image, NGC 3445 (center), PGC 32784 (left), PGC 2554198 (top left) | |
| AladinLite | |
| Constellation | Big Bear |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 10 h 54 m 35.486 s |
| declination | + 56 ° 59 ′ 26.47 ″ |
| Appearance | |
| Morphological type | SAB (s) m |
| Brightness (visual) | 12.3 mag |
| Brightness (B-band) | 12.9 mag |
| Angular expansion | 1.6 ′ × 1.4 ′ |
| Position angle | 105 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 3445 group LGG 226 |
| Redshift | 0.006831 ± 0.000003 |
| Radial velocity | (2048 ± 1) km / s |
|
Stroke distance v rad / H 0 |
(95 ± 7) x 10 6 ly (29.0 ± 2.0) Mpc |
| diameter | 35,000 ly |
| history | |
| discovery | William Herschel |
| Discovery date | April 8, 1793 |
| Catalog names | |
| NGC 3445 • UGC 6021 • PGC 32772 • CGCG 291-011 • MCG + 10-16-023 • IRAS 10515 + 5715 • 2MASX J10543546 + 5659264 • VV 14 • GC 2245 • H I 267 • h 787 • NVSS J105436 + 565921 • • Arp 24 • KPG 256A | |
NGC 3445 is a barred spiral galaxy of the Hubble type SBm in the constellation Great Bear in the northern sky . It is estimated to be 95 million light years from the Milky Way and about 45,000 light years across .
Together with PGC 32784 it forms the gravitationally bound galaxy pair Arp 24 or KPG 256 and together with NGC 3440 and NGC 3458 the NGC 3445 group ( LGG 226 ).
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of one -armed spiral galaxies (Arp catalog) .
The object was discovered on April 8, 1793 by the German-British astronomer William Herschel .
NGC 3445 group ( LGG 226 )
| Galaxy | Alternative name | Distance / million Lj |
|---|---|---|
| NGC 3445 | PGC 32772 | 95 |
| NGC 3440 | PGC 32714 | 88 |
| NGC 3458 | PGC 32854 | 87 |
| PGC 32784 | MCG + 10-16-024 | 81 |
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 3445 - collection of images, videos, and audio files
