[Downloaded from GSFC gopher] Mission Control Center STS-59 Status Report #31 Tuesday, April 19, 1994, 11:30 a.m. CDT Endeavour and its six astronauts will remain in space an additional day. Clouds and high winds in the vicinity of the runway precluded a return to the Kennedy Space Center today. The decision was made following near continuous review of the weather conditions by flight controllers at the Johnson Space Center and Astronaut Robert "Hoot" Gibson flying the Shuttle Training Aircraft at the landing site. Four landing opportunities are available Wednesday -- two in Florida and two at Edwards Air Force Base in California. KSC remains the prime landing site with Edwards serving as the backup. The Florida landing times are 10:29 a.m. and 12:01 p.m. central. The California landing times are 11:54 a.m. and 1:26 p.m. central. The deorbit burn designed to drop Endeavour out of orbit for the landing phase will occur about 50 minutes prior to touchdown. Mission Control's entry team will evaluate weather conditions and make a final decision on the landing site after taking over control of the mission about 4:30 Wednesday morning. Following today's wave off, the crew reconfigured the orbiter systems for the added day on orbit and reactivated a portion of the Space Radar Laboratory payload in the cargo bay. The Space Imaging Radar system (SIR-C) was the only part of the payload to be reactivated. The data recorded during the STS-59 mission would fill the equivalent of 20,000 encyclopedia volumes. Payload managers reported late Monday night that more than 70 million square kilometers of the Earth's surface, including land and sea, have been mapped on this flight. This figure represents about 12 percent of Earth's total surface. The Space Radar Laboratory obtained radar images of approximately 25 percent of the planet's land surfaces. The full complement of payloads will fly again on the STS-68 mission aboard Endeavour in August. The spacecraft remains in a stable 116 nautical mile orbit.