NGC 4817
| Galaxy NGC 4817 |
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|---|---|
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|
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 56 m 29.8 s |
| declination | + 27 ° 56 ′ 24 ″ |
| Appearance | |
| Morphological type | E / C |
| Brightness (visual) | 14.7 mag |
| Brightness (B-band) | 15.7 mag |
| Angular expansion | 0.5 ′ × 0.5 ′ |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 1656 |
| Redshift | 0.022242 +/- 0.000031 |
| Radial velocity | 6668 +/- 9 km / s |
|
Stroke distance v rad / H 0 |
(298 ± 21) · 10 6 ly (91.5 ± 6.4) Mpc |
| history | |
| discovery | Guillaume Bigourdan |
| Discovery date | May 11, 1885 |
| Catalog names | |
| NGC 4817 • PGC 83663 • 2MASX J12562984 + 2756240 • GALEX ASC J125629.66 + 275622.1 | |
NGC 4817 is a 14.7 mag bright elliptical galaxy of the Hubble type "E / C" (the C stands for Compact ) in the Coma Berenices in the northern sky . It is an estimated 298 million light years away from the Milky Way and has a diameter of about 45,000 ly. The galaxy is a member of the Coma galaxy cluster Abell 1656 .
In the same area of the sky are u. a. the galaxies NGC 4816 , NGC 4828 , NGC 4840 , NGC 4850 .
The object was discovered by Guillaume Bigourdan on May 11, 1885 . Bigourdan gave the direct position incorrectly (and never corrected this error), but NGC 4817 can be found correctly in relation to the neighboring galaxies he observed.
Web links
- NGC 4817. DSO Browser, accessed February 15, 2015 .
- Auke Slotegraaf: NGC 4817. Deep Sky Observer's Companion, accessed on February 15, 2015 .