NGC 561

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.

See also

• List of NGC objects (1–1000)
• New General Catalogue