NGC 4686
| Galaxy NGC 4686 |
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|---|---|
![NGC 4686 [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC4686_-_SDSS_DR14.jpg)
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| NGC 4686 SDSS image | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 40 m 39.884 s |
| declination | + 54 ° 32 ′ 03.38 ″ |
| Appearance | |
| Morphological type | Sat |
| Brightness (visual) | 12.8 mag |
| Brightness (B-band) | 13.7 mag |
| Angular expansion | 2.0 ′ × 0.6 ′ |
| Position angle | 3 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 4686 group LGG 300 |
| Redshift | 0.016735 ± 0.000127 |
| Radial velocity | 5017 ± 38 km / s |
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Stroke distance v rad / H 0 |
(228 ± 16) x 10 6 ly (70.0 ± 4.9) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 14, 1789 |
| Catalog names | |
| NGC 4686 • UGC 7946 • PGC 43101 • CGCG 270-021 • MCG + 09-21-044 • 2MASX J12463982 + 5432030 • GC 3216 • H II 796 • h 1428 • LDCE 914 NED006 • NVSS J124640 + 543203 • WISEA J124639.88 +543203.4 | |
NGC 4686 is a 12.8 mag bright spiral galaxy of the Hubble type Sa in the constellation Great Bear in the northern sky . It is estimated to be 228 million light years from the Milky Way and about 135,000 light years in diameter. The galaxy is the brightest member of the NGC 4686 group ( LGG 300 ).
In the same area of the sky are u. a. the galaxies NGC 4646 , NGC 4669 , NGC 4675 , NGC 4695 .
The object was discovered on April 14, 1789 by Wilhelm Herschel with an 18.7-inch reflector telescope, who described it as "pB, cS, lE, bright resolvable nucleus".
NGC 4686 group ( LGG 300 )
| Galaxy | Alternative name | Distance / million ly |
|---|---|---|
| NGC 4566 | PGC 42007 | 243 |
| NGC 4644 | PGC 42708 | 225 |
| NGC 4669 | PGC 42942 | 221 |
| NGC 4675 | PGC 42998 | 217 |
| NGC 4686 | PGC 43101 | 228 |
| NGC 4695 | PGC 43173 | 222 |
| IC 830 | PGC 43533 | 221 |
| PGC 42725 | MCG 09-021-032 | 219 |
| PGC 42841 | MCG 09-21-034 | 222 |
| PGC 42844 | MCG 09-21-033 | 224 |