NGC 3981
| Galaxy NGC 3981 |
|
|---|---|
|
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| NGC 3981 imaged using the FORS2 instrument on the Very Large Telescope | |
| AladinLite | |
| Constellation | cups |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 11 h 56 m 07.4 s |
| declination | -19 ° 53 ′ 46 ″ |
| Appearance | |
| Morphological type | SAB (s) bc / pec |
| Brightness (visual) | 11.0 mag |
| Brightness (B-band) | 11.8 mag |
| Angular expansion | 5.3 ′ × 2.5 ′ |
| Position angle | 15 ° |
| Surface brightness | 13.7 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 263 |
| Redshift | 0.005747 ± 0.000013 |
| Radial velocity | (1723 ± 4) km / s |
|
Stroke distance v rad / H 0 |
(70 ± 5) · 10 6 ly (21.4 ± 1.5) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | February 7, 1785 |
| Catalog names | |
| NGC 3981 • UGCA 255 • PGC 37496 • ESO 572-020 • MCG -03-31-001 • IRAS 11535-1937 • 2MASX J11560744-1953462 • SGC 115334-1937.0 • Arp 289 • VV 8a • GC 2628 • H III 274 • LDCE 856 NED005 | |
NGC 3981 = Arp 289 is a bar-spiral galaxy of the Hubble type SBbc in the constellation Becher south of the ecliptic . It is an estimated 70 million light years away from the Milky Way and has a diameter of about 120,000 ly. NGC 3981 is a member of the NGC 4038 group and thus part of the Virgo supercluster .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy pair belongs to the class galaxies with wind effects . In the same area of the sky are the galaxies NGC 3472 , NGC 3956 , NGC 3957 , NGC 3969 .
The object was discovered on February 7, 1785 by Wilhelm Herschel with the help of his 18.7-inch reflector telescope.
Web links
- SIMBAD Astronomical Database
- ESO: A Galactic Gem with Photos, Map and Animations - September 12, 2018
- astronews.com: Picture of the day from September 13, 2018
- 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
Individual evidence
- ↑ a b c d e f NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 3981
- ↑ Fouque et al. (1992): Groups of galaxies within 80 Mpc. II - The catalog of groups and group members ; in: Astronomy and Astrophysics Supplement Series 93 (2), pp. 211-233
- ↑ Garcia, AM (1993): General study of group membership. II - Determination of nearby groups ; in: Astronomy and Astrophysics Supplement Series 100 (1), pp. 47-90
- ↑ Giuricin et al. (2000): Nearby Optical Galaxies: Selection of the Sample and Identification of Groups ; in: The Astrophysical Journal 543 (1), pp. 178-194
- ^ Tully, RB (1982): The Local Supercluster ; in: The Astrophysical Journal 257, pp. 389-422
- ↑ Seligman