NGC 4940
Galaxy NGC 4940 |
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AladinLite | |
Constellation | centaur |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 13 h 05 m 00.2 s |
declination | -47 ° 14 ′ 13 ″ |
Appearance | |
Morphological type | Sat |
Brightness (visual) | 12.4 mag |
Brightness (B-band) | 13.3 mag |
Angular expansion | 1.0 ′ × 1.0 ′ |
Surface brightness | 12.3 mag / arcmin² |
Physical data | |
Affiliation | LGG 318 |
Redshift | 0.016965 ± 0.000107 |
Radial velocity | 5086 ± 32 km / s |
Stroke distance v rad / H 0 |
(220 ± 15) · 10 6 ly (67.3 ± 4.7) Mpc |
history | |
discovery | John Herschel |
Discovery date | March 3, 1837 |
Catalog names | |
NGC 4940 • PGC 45235 • ESO 269-042 • IRAS 13021-4658 • 2MASX J13050026-4714129 • SGC 130207-4658.1 • GC 3382 • h 3457 • GALEX ASC J130500.25-471411.0 • LDCE 934 NED005 |
NGC 4940 is a 12.4 mag bright spiral galaxy of the Hubble type Sa in the constellation Centaur in the southern sky . It is around 220 million light years away from the Milky Way and has a diameter of around 65,000 light years.
The object was discovered on March 3, 1837 by John Herschel with an 18-inch reflector telescope, who noted "F, S, R, 15 arcseconds, The following of two". The first object, mistakenly mistaken for a galaxy, is the asterism NGC 4937 .