NGC 3445
Galaxy NGC 3445 |
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SDSS image, NGC 3445 (center), PGC 32784 (left), PGC 2554198 (top left) | |
AladinLite | |
Constellation | Big Bear |
Position equinox : J2000.0 , epoch : J2000.0 |
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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