JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109


PHOTO CAPTION                                MAGELLAN
                                             P-38341  MGN-49
                                             5/21/91


     This image compares the best available views of the crater
Golubkina as of August 1990 (left) and April 1991 (right).  The
crater, 34 kilometers (21.1 miles) in diameter, is named for the
Russian sculptress Anna Golubkina (1864-1927).  It is located at
about 60.5 degrees north latitude, 287.2 degrees east longitude.
The area shown is approximately 100 kilometers (62 miles) by 215
kilometers (133 miles).  The left image shows Magellan data from
the initial test of the radar system (August 1990), overlain on an
image obtained by the Soviet Venera 15 and 16 spacecraft in 1983-
84.  The data in the right image were obtained by Magellan in April
1991.  The new image demonstrates the increase in detail obtained
by Magellan as compared with Venera.  Magellan achieved a ten-fold
improvement in resolution - 120 meters (400 feet) versus 1.5
kilometers (0.9 miles), for Venera 15 and 16.  The new Magellan
data provide the first opportunity to "revisit" areas previously
imaged by the spacecraft.  There is no evidence in these images for
changes in the surface over 243 days.