Huge NASA telescope may be headed for fiery descent to splash landing
The observatory was launched in 1991
January 14, 2000
Web posted at: 7:49 p.m. EST (0049 GMT)
From Space Correspondent Miles O'Brien
GREENBELT, Maryland (CNN) -- After nearly nine years in space, a 35,000 pound NASA
observatory in low-Earth orbit may be destined for a fiery descent into the Pacific Ocean near
Hawaii this spring.
"We have formed a team to see if we need to bring it down in a controlled reentry," says
Preston Burch, deputy program manager for space science operations at NASA's Goddard
Space Flight Center.
| MESSAGE BOARD|
In early December, the $600 million Compton Gamma-Ray Observatory lost one of its
gyroscope systems, leaving it with the minimum of two required to conduct scientific
observations. Engineers running the program at Goddard are uncertain if they need two
operative gyroscopes to safely steer the satellite away from population centers.
The question is: Can we tolerate another failure?" said Burch. "If the answer is yes, then we
can continue (in orbit) indefinitely."
But if the answer is "no," NASA will try to steer Compton down into the Pacific near Hawaii
on March 14.
"The debris field is significant," according to Burch. According to engineering estimates, it
will be 26 kilometers (16 miles) wide by 1,552 kilometers (962 miles) long
-- putting approximately 40,000 square
kilometers (24,800 square miles) of ocean in harm's way.
Launched from the space shuttle Atlantis on April 5, 1991, the Compton Gamma-Ray
Observatory was designed to orbit for at least two years gathering information on
electromagnetic radiation -- shedding light on the origins of the universe. While the scientific
observations continue, the staff -- and the funding -- are currently very lean.
Compton is the heaviest unclassified satellite ever deployed by a space shuttle. The Hubble
Space Telescope, launched in April of 1990, weighs 10,000 pounds less, despite being larger.
Unlike Hubble, Compton was not designed to be serviced by astronauts in its 270 mile orbit.
Engineers are busy culling old records and faded memories to determine if Compton can
fly on safely. On February 16, they will report their findings to NASA managers. Unless they
can allay concerns about an uncontrolled descent (a la Skylab), they will decide at that time
to bring the telescope down on March 14.
"We are putting a full court press on this." says Burch. "This is as fast as we can make it
Chandra Xray Observatory Center
AXAF: Exploring the X-ray Universe
X-Ray Calibration Facility (XRCF)
Compton Observatory Science Support Center
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