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NGC 4657
NGC 4657, I 177, h 1415, GC 3190
RA: 12h 44m 6.36s
Dec: +32° 12′ 30.2″
Con: Canes Venatici
Ch: MSA:653, U2:108, SA:7
Ref: SIMBAD, Corwin (2004)
Type: galaxy
Mag: B=?, V=?
Size: ?
PA: ?
Historical observations
William Herschel (c.1784)
Synonyms: H I-177
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "Two. The southern [NGC 4656] cB, E, mbM. The northern [NGC 4657] pB, E, sp-nf; Both join and form the letter S."
NGC
Dreyer notes that according to Lord Rosse, NGC 4657 and NGC 4656 are connected by faint nebulosity.
Published comments
Sulentic & Tifft (1973)
(Sulentic and Tifft 1973) notes that this is a galaxy. Their coded description reads EL,VDIF,LBM,PART56)).
Sandage & Tammann (1975)
Sandage, A. & Tammann, G. A. (1975) Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field. ApJ, 196, 313-328. [1975ApJ...196..313S]
(1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the Canes Venatici II Cloud. Members include NGC 3675, NGC 4051, NGC 4485, NGC 4490, NGC 4627, NGC 4631, NGC 4656 & NGC 4657.
de Vaucouleurs, G. (1975) Canes Venatici II Cloud
de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.
This is part of the complex region described as the Canes Venatici (M94) cluster by van den Bergh and as the UMa II group by Sersic. ... a dozen bright objects (NGC 3769 3769A 3949 4051 4088 4111 4143 4242 4485 4490 4625 4618), mainly late-type spirals and irregulars (NGC 4111 and 4143 are lenticulars) form an elliptical core area measuring 15° x 8° ... the overall dimensios of the cloud are increased to 22° x 12° is several probable or possibly outlying members such as NGC 3675 4627 4631 4656/4657 4800 and the dwarf systems NGC 4025 4288 are included.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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