THE DISCOVERY OF A SMALL-GROUP OF GALAXIES IN URSA-MAJOR BY THE HUBBLE-SPACE-TELESCOPE

We present HST/WFPC2 images of a previously unknown loose group of gal axies in Ursa Major. These images were obtained as part of the GTO par allel program in which WFPC2 images are taken using the F606W (wide V) and F814W (I band) filters in parallel with GTO observations using ot her HST instruments. These WFPC2 images, obtained in parallel with FGS observations of ED + 67 degrees 552 on 1994 April 22 contain a number of galaxies between 4'' and 11'' in diameter as well as a multitude o f other, smaller galaxies, The group is dominated by eight spiral gala xies and one elliptical galaxy in an area smaller than one Wide Field Camera chip (80''X80''). We present V and I band photometry, V-I color s, and V-I color gradients of each galaxy in the group. The luminosity function provides evidence that the smaller, fainter galaxies are bac kground to the group. We estimate the redshift of the cluster to be z similar to 0.2(H-0 = 75 and q(0) = 0). (C) 1996 American Astronomical Society.