The objectives of the EUVE Extreme Ultra-Violet Explorer mission were: (1) produce a high-sensitivity "all-sky" survey in the 70- to 760-angstrom portion of the spectrum; (2) perform a "deep survey" of a strip of the sky along the ecliptic with extremely high sensitivity; (3) perform follow-up spectroscopic observations on bright extreme ultraviolet point sources; (4) study stellar evolution and the local stellar population; (5) investigate energy transport in stellar atmospheres; and (6) study ionisation and opacity of the interstellar medium. The initial "all-sky" survey was completed in January 1993, and a Guest Observer program was initiated in February, 1993. EUVE was controlled from the Centre for EUV Astrophysics at the University of California, Berkeley. Spacecraft: Based on the NASA/Fairchild Multi-Mission Spacecraft (MMS) bus.3-axis stabilised. Downlink through TDRSS at 512 kbit/sec. Designed for on-orbit servicing by the Shuttle. Payload: Three grazing incidence UV telescopes covering 80-900 angstroms (188 kg each). One EUV spectrometer (323 kg). The scanning telescopes compiled all-sky maps over 80-900 angstroms with positional accuracy of 0.1 deg. The spectrometer observed in the anti-Sun direction along the ecliptic, to complete a survey in two bands between 80-500 angstroms.

Design Life: 19 months. Total Length: 4.5 m. Maximum Diameter: 3.0 m. Total Mass: 3,275 kg.

Extreme Ultra-Violet Explorer; mapped galactic EUV sources. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

A Guest Observer program was initiated in February, 1993.

• 2 - McDowell, Jonathan, The United Nations Registry of Space Objects, Harvard University, 1997. HTML when accessed: http://hea-www.harvard.edu/QEDT/jcm/space/un/un.html
• 6 - JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. HTML when accessed: http://msl.jpl.nasa.gov/home.html
• 279 - McDowell, Jonathan, Launch Log, October 1998. HTML when accessed: http://hea-www.harvard.edu/~jcm/space/log/launch.html