NGC 542
| Galaxy NGC 542 |
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|---|---|
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| Image of the HCG 10 with an 80 cm telescope. NGC 542 is in the lower left. | |
| AladinLite | |
| Constellation | Andromeda |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 01 h 26 m 30.9 s |
| declination | + 34 ° 40 ′ 31 ″ |
| Appearance | |
| Morphological type | Scd |
| Brightness (visual) | 14.8 mag |
| Brightness (B-band) | 15.6 mag |
| Angular expansion | 1 ′ × 0.2 ′ |
| Position angle | 146 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 26 |
| Redshift | 0.015551 +/- 0.000027 |
| Radial velocity | 4662 +/- 8 km / s |
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Stroke distance v rad / H 0 |
(215 ± 15) x 10 6 ly (65.9 ± 4.6) Mpc |
| history | |
| discovery | RJ Mitchell |
| Discovery date | October 16, 1855 |
| Catalog names | |
| NGC 542 • PGC 5360 • CGCG 521-026 • MCG + 06-04-022 • 2MASX J01263085 + 3440318 • HCG 10D • GC 318 • | |
NGC 542 is a spiral galaxy in the constellation Andromeda , which is approximately 215 million light years from the Milky Way . NGC 542 together with the galaxies NGC 529 , NGC 531 and NGC 536 form the Hickson Compact Group 10, abbreviated as HCG 10.
The Danish astronomer Johan Ludvig Emil Dreyer noted William Parsons as the discoverer in his New General Catalog, published in 1888 . The observation at Birr Castle with the 72 " reflecting telescope was carried out on October 16, 1855 by his assistant at the time, RJ Mitchell .
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