NGC 4577
| Galaxy NGC 4577 / NGC 4591 |
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|---|---|
![NGC 4577 with LEDA 1292918 [1], SDSS image](https://de.wikipedia.org/wiki/Datei:NGC4591_-_SDSS_DR14.jpg)
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| NGC 4577 with LEDA 1292918 , SDSS Recording | |
| AladinLite | |
| Constellation | Virgin |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 39 m 12.440 s |
| declination | + 06 ° 00 ′ 44.30 ″ |
| Appearance | |
| Morphological type | Sb / HII |
| Brightness (visual) | 13.0 likes |
| Brightness (B-band) | 13.8 mag |
| Angular expansion | 1.6 x 0.8 |
| Position angle | 37 ° |
| Surface brightness | 13.1 mag / arcmin² |
| Physical data | |
| Affiliation | Virgo cluster |
| Redshift | 0.008079 ± 0.000023 |
| Radial velocity | 2422 ± 7 km / s |
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Stroke distance v rad / H 0 |
(105 ± 8) x 10 6 ly (32.2 ± 2.3) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | January 28, 1784 |
| Catalog names | |
| NGC 4577/4591 • UGC 7821 • PGC 42319 • CGCG 042-191 • MCG + 01-32-125 • IRAS 12366 + 0617 • 2MASX J12391244 + 0600439 • VCC 1780 • GC 3117 • H III 13 / III 504 • GALEX ASC J123912 .48 + 060042.9 • LDCE 904 NED211 • EVCC 994 | |
NGC 4577 = NGC 4591 is a spiral galaxy with extensive star formation regions of the Hubble type Sab in the constellation Virgo north of the ecliptic . It is estimated to be 105 million light years from the Milky Way and about 50,000 light years in diameter. It is listed as a member of the Virgo galaxy cluster under catalog number VCC 1780 .
In the same area of the sky are u. a. the galaxies NGC 4543 , NGC 4580 , NGC 4588 , IC 3576 .
The object was discovered on January 28, 1784 by the astronomer Wilhelm Herschel with the help of his 18.7 inch reflector telescope.