NGC 6027
| Seyfert's Sextet / NGC 6027 | |
|---|---|
|
|
| Seyfert's sextet as captured by the Hubble Space Telescope | |
| Constellation | Snake |
|
Position Epoch : J2000.0 Equinox : J2000.0 |
|
| Right ascension | 15 h 59.2 m |
| declination | + 20 ° 45.5 ′ 0 ″ |
| Appearance | |
| Apparent brightness (visual) | 13.4 mag |
| Angular expansion | 1.9 ' |
| Number of galaxies | 4th |
| Brightest member | PGC 56575 |
| Physical data | |
| Redshift | +0.0145 |
| Radial velocity | +4350 km / s |
| distance | approx. 190 million light years |
| history | |
| discovery |
as a foggy object: Édouard Jean-Marie Stephan , March 20, 1882 as a group of galaxies: |
| Catalog names | |
| HCG 79 • NGC 6027 • UGC 10116 • CGCG 137-010 • VV 115 • VII Zw 631 | |
Seyfert's sextet , cataloged as HCG 79 and NGC 6027 , is a compact group of galaxies located in the head of the constellation Snake . The group appears to consist of six individual galaxies, which is what gave it its name, but a closer look reveals that it consists of only four galaxies. The fifth is so distant from the others that it does not play a role in the interaction of the galaxies with one another, and the sixth suspected galaxy is actually a star cluster that has moved away from another due to the pull of one galaxy.
190 million light-years away from Earth , the four galaxies hold together in a space of 100,000 light-years in diameter due to the mutual forces of gravity . This is roughly the size of our Milky Way , making it one of the densest known galaxy groups . Scientists suspect that these gravitational forces will hold the group together for several hundred million years and that the group could then unite into a single, giant elliptical galaxy .
The galaxy group was originally discovered on March 20, 1882 by the French astronomer Édouard Jean-Marie Stephan and later added by Johan Ludvig Emil Dreyer as number 6027 in his New General Catalog of Nebulae and Clusters of Stars . It was not until 1951 that the American astronomer Carl Keenan Seyfert discovered that NGC 6027 was a total of six different objects. In 1960 this group of galaxies was named after him after his death.
Galaxies in NGC 6027 (Seyferts Sextet)
| PGC |
NGC (Seyfert) |
NGC ( RC3 ) |
HCG | NGC | Right asc. | declination |
Angle ext. ( Arc min. ) |
Shine bright. (like) |
Rec. Speed | Type | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Equinox 2000 | NED | NOAO | |||||||||
| 56584 | 6027b | 6027 | 79c | 6027B | 15: 59: 10.8 | +20: 45: 43 | 0.4 x 0.2 | 15.31 | 4053 | 4413 | Sa pec |
| 56576 | 6027a | 6027A | 79a | 6027A | 15: 59: 11.1 | +20: 45: 16 | 0.5 x 0.4 | 14.98 | 4237 | 4197 | Sa pec |
| 56578 | 6027c | 6027C | 79d | 6027 | 15: 59: 11.8 | +20: 44: 49 | 0.9 x 0.2 | 16.75 | 4620 | 4482 | SB (s?) C pec |
| 56575 | 6027 | 6027E | 79b | 6027E | 15: 59: 12.5 | +20: 45: 48 | 0.4 x 0.2 | 14.7 | 4447 | 4095 | S0 pec |
| 56580 | 6027d | 6027D | 79e | 6027D | 15: 59: 12.9 | +20: 45: 35 | 0.2 x 0.2 | 16.47 | 19809 | 19813 | SB (s) bc: pec |
| 56579 | 6027e | 6027B | 79b1 | 6027C | 15: 59: 14.5 | +20: 45: 57 | 0.8 x 0.4 | 16.7 | 4095 | 4017 | SB: 0? |
See also
Web links
- Seyfert's Sextet - Astronomy Picture of the Day from January 24, 2003 (English).
- SEDS
- SIMBAD query
- NASA / IPAC Extragalactic Database