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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]
2 Andromedae, abbreviated 2 And, is a binary star [4] system in the northern constellation of Andromeda. 2 Andromedae is the Flamsteed designation . It is a faint star system but visible to the naked eye with a combined apparent visual magnitude of 5.09. [ 3 ]
The star is faintly visible to the naked eye, having an apparent visual magnitude of 5.68. [2] Based upon an annual parallax shift of 29.12 [1] mas as seen from Earth, it is located 112 light years away. 5 Andromedae is moving closer to the Sun with a radial velocity of −2.6 km/s. [2]
HD 16028 is a star in the constellation Andromeda. Its apparent magnitude is 5.71. [2] Located approximately 225 parsecs (730 ly) distant, [1] it is an orange giant of spectral type K3III, [3] a star that has used up its core hydrogen and has expanded. Double star catalogues list two stars as optical companions.
51 Andromedae, abbreviated 51 And and formally named Nembus / ˈ n ɛ m b ə s /, [8] is the 5th brightest star in the northern constellation of Andromeda, very slightly dimmer than the Andromeda Galaxy also being of 4th magnitude.
15 Andromedae, abbreviated 15 And, is a single, [10] variable star [7] in the northern constellation of Andromeda. 15 Andromedae is the Flamsteed designation, while its variable star designation is V340 And. [9] Its apparent visual magnitude is 5.55, [3] which indicates it is faintly visible to the naked eye.
The 6.06 magnitude companion star is a B-type main sequence star with a classification of B9 V. On average the two stars are separated by about 0.6 arcseconds and have an orbital period of roughly 554 years. Based upon their orbital elements, the system has a combined mass of around 6.5 ± 2.8 [7] times the mass of the Sun.
7 Andromedae (abbreviated 7 And) is a single, [9] yellow-white hued star in the northern constellation of Andromeda. 7 Andromedae is the Flamsteed designation . It is visible to the naked eye with an apparent visual magnitude of 4.52, [ 2 ] and is located 79.6 light years from Earth, based on an annual parallax shift of 41 mas . [ 1 ]