His target-of-opportunity program on the International Ultraviolet Explorer
launched him into studies of SN 1987A, and he is now principal investigator for the Supernova Intensive Study (SINS) on the Hubble Space Telescope.
These malfunctions puzzle NASA, particularly since the agency's calculations, based in part on experience with the International Ultraviolet Explorer
(IUE) satellite, had indicated that the gyroscopes would last 14 years, Campbell observes.
When the nova's discovery was announced, the scheduled observer on the International Ultraviolet Explorer
(IUE) satellite was Chi-Chao Wu (Space Telescope Science Institute), a longtime nova observer.
Panagia and his colleagues, including scientists from Harvard University and the Space Telescope European Coordinating Facility in Garching, Germany, based their work on observations by the International Ultraviolet Explorer
(IUE) satellite and Hubble Space Telescope.
Thanks to electronic mail, observations of the nova with the International Ultraviolet Explorer
(IUE) satellite began within 15 hours of the discovery report.
The unprecedented campaign to pin down the size and characteristics of the gas flows swirling around the galaxy's core required the coordination of observations made by the International Ultraviolet Explorer
(IUE) spacecraft and more than a dozen ground-based telescopes.
The International Ultraviolet Explorer
has persevered far beyond its expected lifetime to become one of the most productive telescopes in history.
Osantowski also observes that magnesium fluoride has maintained an apparently strong track record in space: No such coating has yet been found significantly degraded, including any on the 12-year-old International Ultraviolet Explorer
, he says.
Mark Wagner of Ohio State University in Columbus and Angelo Cassatella of the European Space Agency's International Ultraviolet Explorer
observatory in Madrid traced the X-ray source to a system known as V404 Cygni, whose last sudden intensification occurred in 1938 when it became 2,000 times brighter than normal.
Data from the International Ultraviolet Explorer
satellite and observations made at a South African observatory confirmed this "inflection" in the light curve.
Working with ultraviolet light measurements obtained by NASA's International Ultraviolet Explorer
satellite, the researchers discovered three Wolf-Rayet stars that also appear to lie within and near the center of wispy, much more distant, expanding gaseous shells.
Kirshner of the Harvard-Smithsonian Center for Astrophysics, who supervises observations by the International Ultraviolet Explorer
satellite, to remark, "I hope not.