NGC 561 is a barred spiral galaxy located in the constellation Andromeda.[2] 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).[3] NGC 561 was discovered by Prussian astronomer Heinrich d'Arrest in 1862.[4]
NGC 561 | |
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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/arcsec^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
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External links
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