NGC 561
Galaxy in the constellation Andromeda
From Wikipedia, the free encyclopedia
NGC 561 is a barred spiral galaxy located in the constellation Andromeda.[3] Its speed relative to the cosmic microwave background is 4,395 ± 20 km/s, which corresponds to a Hubble distance of 64.8 ± 4.6 Mpc (~211 million ly).[4] NGC 561 was discovered by Prussian astronomer Heinrich d'Arrest in 1862.[5]
| NGC 561 | |
|---|---|
| |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 01h 28m 18s[1] |
| Declination | 01° 28′ 18″[1] |
| Redshift | 0.015758[1] |
| Heliocentric radial velocity | 4687 ± 4 km/s[1] |
| Apparent magnitude (B) | 14.1 |
| Surface brightness | 23.44 mag/arcsec2 |
| Characteristics | |
| Type | (R)SB(s)a[2] |
| Other designations | |
| UGC 1048, MCG +06-04-029, PGC 5489[1] | |
The luminosity class of NGC 561 is I and it has a broad HI1 line.[1][clarification needed]
NGC 561 is part of the NGC 507 group. This vast group includes at least 42 galaxies, 21 of which appear in the NGC catalog and 5 in the IC catalog. Four members of this group are also Markarian galaxies. The brightest of these galaxies is NGC 507 and the largest is NGC 536.