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]
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.
NGC561 is a barred spiral galaxy located in the constellation Andromeda. Its speed relative to the cosmic microwave background is 4,395 ± 20 km/s, which...
Quasar (also known as Twin QSO, Double Quasar, SBS 0957+561, TXS 0957+561, Q0957+561 or QSO 0957+561 A/B), was discovered in 1979 and was the first identified...
"Soft X-ray properties of the Seyfert 1.8 galaxy NGC 3786", Astronomy and Astrophysics, 327: 555–561, arXiv:astro-ph/9707071, Bibcode:1997A&A...327..555K...
contains four globular clusters in its main body, with the brightest of them—NGC 6715 (M54)—being known well before the discovery of the galaxy itself in...
unusually hot LBV) NGC 2403: V12 V37 V38 J025941.21+251412.2 J025941.54+251421.8 NGC 2363-V1 J122809.72+440514.8 J122817.83+440630.8 NGC 4736_1 Unnamed star...
Messier 67 (also known as M67 or NGC 2682) and sometimes called the King Cobra Cluster or the Golden Eye Cluster is an open cluster in the southern, equatorial...
Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus. It was...
NGC 5477 is a dwarf galaxy located in the constellation of Ursa Major, 20 million light years away from Earth. It was discovered on April 14, 1789, by...
In 1782, William Herschel, discoverer of Uranus, found the Saturn Nebula (NGC 7009) and described it as "A curious nebula, or what else to call it I do...
Messier 92 (also known as M92, M 92, or NGC 6341) is a globular cluster of stars in the northern constellation of Hercules. It was discovered by Johann...
together with the name of the observing project (HUDF, SDSS, 3C, CFHQS, NGC/IC, etc.) This is a list of galaxies that are well known by something other...
NGC 3539 is a lenticular galaxy in the constellation Ursa Major. It was discovered in April 1831 by John Herschel. It is a member of the galaxy cluster...
NGC 613 is a barred spiral galaxy located 67 million light years away in the southern constellation of Sculptor. This galaxy was discovered in 1798 by...
NGC 959 is a spiral galaxy in the northern constellation of Triangulum. It was discovered on November 9, 1876, by French astronomer Édouard Stephan. This...
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