NGC 4540
| Galaxy NGC 4540 |
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![HOLM 421: IC 3528 & NGC 4540 [1] SDSS image of the spiral galaxy NGC 4540](https://de.wikipedia.org/wiki/Datei:NGC4540_-_SDSS_DR14.jpg)
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| HOLM 421: IC 3528 & NGC 4540 SDSS image of the spiral galaxy NGC 4540 | |
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 34 m 50.9 s |
| declination | + 15 ° 33 ′ 04 ″ |
| Appearance | |
| Morphological type | SAB (rs) cd / LINER / Sy1 |
| Brightness (visual) | 11.8 mag |
| Brightness (B-band) | 12.5 mag |
| Angular expansion | 1.9 ′ × 1.5 ′ |
| Position angle | 40 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Affiliation | Virgo cluster NGC 4343 group NGC 4636 group Messier 49 group LGG 292 |
| Redshift | 0.004306 ± 0.000007 |
| Radial velocity | 1291 ± 2 km / s |
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Stroke distance v rad / H 0 |
(56 ± 4) · 10 6 ly (17.1 ± 1.2) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | March 21, 1784 |
| Catalog names | |
| NGC 4540 • UGC 7742 • PGC 41876 • CGCG 099-093 • MCG + 03-32-74 • IRAS 12323 + 1549 • 2MASX J12345086 + 1533052 • VCC 1588 • GC 3084 • H II 94 / II 119 • h 1335 • LDCE 904 NED189 • HOLM 421A • EVCC 2171 | |
NGC 4540 is a bar-spiral galaxy with an active nucleus of the Hubble type SBc in the constellation Coma Berenices in the northern sky . It is estimated to be 56 million light years from the Milky Way and about 35,000 light years across. It is listed as a member of the Virgo galaxy cluster under catalog number VCC 1588 .
Together with IC 3528 , it forms the galaxy pair Holm 421 . The galaxies NGC 4523 , IC 800 , IC 3519 are located in the same area of the sky .
The object was discovered on March 21, 1784 by the astronomer William Herschel with the help of his 18.7 inch reflector telescope.