Object of the Week, August 3, 2014 - Seyfert's Sextet

[Ciel Extreme]

Just downloaded the book from the SAO/NASA Astrophysics Data System. There is no “f” listed for group 79.

[Steve Gottlieb]

I didn't know you can download the entire contents of 1994 spiral-bound book? In any case, I checked my copy of the book earlier (I bought it when it first came out) and like you found no 79f, though Hickson mentions "The diffuse extension northwest of b was thought by Seyfert to be a sixth galaxy." So, it appears Hickson didn't introduce this designation for the diffuse tail as he didn't consider it a separate object.

[Ciel Extreme]

The version available at the ADS was originally published in Astrophysics Letters and Communications, 1993, Volume 29. Someone at the StScI went to the trouble of scanning the entire 207 page paper. Those interested in downloading should note that it is a 164 meg file and takes a few minutes.