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Type: galaxy, SB0
Mag: B=12.7, V=?
Size: 2.754′ x 2.238′
(Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads SBO),DIFOVAL,SMBBAR.
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 NGC 6643 Group. Members include NGC 6217, NGC 6340, NGC 6412, NGC 6643 & NGC 6654.
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.
Foreground NGC 6503; background NGC 6621.
Brightest members: 6643 ( B(0) = 11.97), 6217 ( B(0) = 12.17), 6340 ( B(0) = 12.21), 6412 ( B(0) = 12.62), 6654 ( B(0) = 12.80).
("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the NGC 6643 group are NGC 6643, NGC 6217, NGC 6340, NGC 6412 & NGC 6654. NGC 6503 is a foreground member, and NGC 6621 is a background member.
15cm - mod f @ 80x w/m10.5 * on E. seems oval, sl elong ~E-W, 1'.75x1'.5. mod
broad concen except consp *ar nuc. BS, 29Jun1992, Anderson Mesa.
The Messier objects
The Bennett objects
The Caldwell list
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