VV 166
| VV 166 / NGC-70 group | |
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| Image taken with a 24-inch telescope. North is roughly in the lower right corner. The bright spiral galaxy below the center of the image is NGC 70; to the left below is NGC 68, to the left above NGC 71; NGC 72 can be found immediately to the left of the center of the image. | |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Andromeda |
| Right ascension | 00 h 18.4 m |
| declination | + 30 ° 04 ′ 0 ″ |
| Physical data | |
| Redshift | approx. 0.02 |
| Radial velocity | approx. 7000 km / s |
| Velocity dispersion | 240 km / s (not including NGC 68) |
| distance | approx. 300 million light years approx. 90 million parsecs |
| Catalog names | |
| VV 166, Arp 113, Holm 6, SRGb062 | |
VV 166 or the NGC-70 group (sometimes also Arp 113 ) is a compact group of galaxies in the constellation Andromeda . The group is about 90 million parsecs away and has a certain resemblance to Stephen's quintet . Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of elliptical galaxies close to spiral galaxies and disturbing them (Arp catalog) .
Members
The brighter group members include the spiral galaxies NGC 70, the elliptical galaxy NGC 71 and the barred spiral galaxy NGC 72, the less luminous NGC 69 and PGC 1185. The brightest galaxy in the group, the elliptical galaxy NGC 68, is probably not a member of the group .
| designation |
α J2000.0 |
δ J2000.0 |
Morphological type | m V | Angular expansion | Position angle | Distance ( million years ) | Catalog names |
|---|---|---|---|---|---|---|---|---|
| PGC 138159 | 00 h 18 m 12.2 s | + 30 ° 03 ′ 20 ″ | E. | 14.7 | 0 ′, 4 × 0 ′, 2 | 100 ° | 285 | historically observed object that led to entry NGC 67 |
| PGC 1185 | 00 h 18 m 14.8 s | + 30 ° 03 ′ 48 ″ | E5 | 14.8 | 0 ′, 3 × 0 ′, 2 | 51 ° | 304 | PGC 138160 identified as NGC 67 in many catalogs |
| NGC 69 | 00 h 18 m 20.5 s | + 30 ° 02 ′ 24 ″ | E / SB0 | 14.8 | 0 ′, 5 × 0 ′, 3 | 33 ° | 306 | PGC 1191, CGCG 499-105, MCG + 05-01-66 |
| NGC 70 | 00 h 18 m 22.5 s | + 30 ° 04 ′ 46 ″ | Sbc | 13.4 | 1 ′, 6 × 1 ′, 4 | 0 ° | 328 | IC 1539, UGC 174, PGC 1194, CGCG 499-108, MCG + 05-01-67 |
| NGC 71 | 00 h 18 m 23.6 s | + 30 ° 03 ′ 48 ″ | E-S0 / P | 13.3 | 1 ′, 2 × 0 ′, 9 | 129 ° | 307 | UGC 173, PGC 1197, CGCG 499-107, MCG + 05-01-68 |
| NGC 72 | 00 h 18 m 28.4 s | + 30 ° 02 ′ 26 ″ | SBa | 13.8 | 1 ′, 1 × 0 ′, 9 | 15 ° | 332 | UGC 176, PGC 1204, CGCG 499-109, MCG + 05-01-69 |
| NGC 72A | 00 h 18 m 34.3 s | + 30 ° 02 ′ 11 ″ | E. | 14.7 | 0 ′, 3 × 0 ′, 3 | 307 | PGC 1208, CGCG 499-110, MCG + 05-01-70 | |
| Probably not a member | ||||||||
| NGC 68 | 00 h 18 m 18.5 s | + 30 ° 04 ′ 18 ″ | E1 | 13.2 | 1 ′, 2 × 1 ′, 1 | 0 ° | 264 | UGC 170, PGC 1187, CGCG 499-106, MCG + 5-1-65, IRAS 00157 + 2947, HV 16 |
Observation history
The first observation of the galaxies dates back to September 11, 1784 and was made by Wilhelm Herschel , who probably saw the mixed light of several objects in this area of the sky. On October 7, 1855, William Parsons observed the galaxies and noted seven nebulae. The objects were later included by Dreyer as NGC 67 to NGC 72 and as NGC 74 in his New General Catalog. The entry NGC 67 has been identified in modern catalogs with the galaxy PGC 1185. Using the observation sketch by Parsons, however, it was later determined that he had not observed this galaxy, but rather the somewhat less bright and further south-west galaxy PGC 138159 (sometimes referred to as NGC 67A), while the galaxy PGC, which is about halfway to NGC 68 1185 is drawn there as a star.
Erik Holmberg described the compact group of galaxies in his dissertation from 1937, in Arp's catalog from 1966 it is photographed and bears the number 113.
swell
- John Kormendy, Wallace LW Sargent: Tidal effects as criteria for membership in small groups of galaxies: application to VV 166, in: Astrophysical Journal, 193, pp. 19-25 (October 1974).
Web links
Individual evidence
- ↑ a b c Searching NED. In: NASA / IPAC EXTRAGALACTIC DATABASE. Retrieved March 22, 2019 .
- ↑ a b SEDS : NGC 67
- ↑ SEDS : NGC 69
- ↑ SEDS : NGC 70
- ^ SEDS : NGC 71
- ↑ a b SEDS : NGC 72
- ↑ SEDS : NGC 68
Attention: The sorting key "VV 166" overwrites the previously used key "IC1539".