Messier 102
| Galaxy Messier 102 |
|
|---|---|
|
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| The lenticular galaxy M102 captured by the Hubble Space Telescope . | |
| AladinLite | |
| Constellation | Dragon |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 15 h 6 m 29.5 s |
| declination | + 55 ° 45 ′ 48 ″ |
| Appearance | |
| Morphological type | S0_3 HII / LINER |
| Brightness (visual) | 9.9 likes |
| Brightness (B-band) | 10.8 mag |
| Angular expansion | 6.5 ′ × 3.1 ′ |
| Position angle | 128 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 396 |
| Redshift | 0.002518 ± 0.000017 |
| Radial velocity | (755 ± 5) km / s |
|
Stroke distance v rad / H 0 |
(40 ± 3) x 10 6 ly (12.3 ± 0.9) Mpc |
| diameter | 60,000 ly |
| history | |
| discovery | Pierre Méchain |
| Discovery date | March 27, 1781 |
| Catalog names | |
| M 102 • NGC 5866 • UGC 9723 • PGC 53933 • CGCG 274-016 • MCG + 09-25-017 • IRAS 15051 + 5557 • GC 4058 • h 1909 • H I 215 | |
Messier 102 (also known as NGC 5866) is a lenticular galaxy with dimensions 6.5 'x 3.1' and an apparent magnitude of 9.9 mag in the constellation of Dragon . Since they are considered the prototype of a lenticular galaxy, i. H. a Hubble-type galaxy S0, it is also known as the Spindle Galaxy . This name is ambiguous, however, as, for example, reference is also made to the lens-shaped galaxy NGC 3115 under the same name.
Today M 102 is generally assigned to the NGC object NGC 5866. However, there is controversy as to whether Messier actually meant this galaxy, or whether M 102 is a double observation of M 101 . Others suspect that Messier was referring to NGC 5879 or NGC 5928 instead , but both are fainter than NGC 5866. Entry number 102 in Messier's catalog was originally observed by Pierre Méchain , but the transfer to Messier's final catalog happened in a hurry and without any coordinates; only with the incorrect description that the location of the nebula is between the stars ο Boo and ι Dra.
Web links
- M102 at SEDS
- NGC 5866 at SEDS
- An image taken with the Hubble Space Telescope
- NGC5866
- Spektrum.de : Amateur recordings [1]
