| NGC 561 | |
|---|---|
 | |
| Observation data (J2000epoch) | |
| 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] | |
NGC 561 is abarred spiral galaxy located in the constellationAndromeda.[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 astronomerHeinrich d'Arrest in 1862.[5]
Theluminosity class of NGC 561 is I and it has a broad HI1 line.[1][clarification needed]
NGC 561 is part of theNGC 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 alsoMarkarian galaxies. The brightest of these galaxies is NGC 507 and the largest is NGC 536.
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