NGC 4686
Galaxy NGC 4686 |
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NGC 4686 SDSS image | |
AladinLite | |
Constellation | Big Bear |
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 |
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 |