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NOTE: Most of the High Level Science Products are unavailable while unscheduled maintenance is being performed. They will be incrementally restored over the course of this week. We apologize for any inconvenience.



ORFEUS-SPAS II The Interstellar Medium Absorption Profile Spectrograph (IMAPS) flew on its first Shuttle-launched mission in September 1993, as part of the ORFEUS-SPAS program sponsored jointly by NASA and the German Space Agency (DARA). A second shuttle flight (i.e., as part of the ORFEUS-SPAS II mission), occurred in November 1996, aboard the shuttle Columbia. The objective-grating echelle spectrograph was designed to obtain high resolution spectra of bright stars in the 950-1150 Å wavelength region; a region not detectable by HST. IMAPS is capable of producing spectra with a resolution of R = 240,000 (i.e., corresponding to a doppler shift of ~ 1 km/sec), making it the highest resolution spectrograph ever flown in space.

The NASA photo above shows the ORFEUS-SPAS II platform prior to being launched from the NASA Space Shuttle COLUMBIA. IMAPS is the long shiny tube seen piggy-backed on the right side of the platform. (Clicking on the image will show an expanded view.) The other 2 instruments on baord ORFUES-SPAS which share a single main telescope, include the Berkeley Extreme Ultraviolet Spectrometer (EUV) provided by the University of California at Berkeley, and the Far-Ultraviolet Echelle Spectrograph (FUV) designed by the University of Tubingen and the Landessternwarte Heidelberg.

The IMAPS Science Team included the following:

Dr. Edward Jenkins (Princeton University Observatory) - Principal Investigator
Dr. Charles Joseph (Rutgers University, Physics and Astronomy) IMAPS-1,
Dr. Ulysses Sofia (Villanova University, Astronomy and Astrophysics),
Dr George Sonneborn (NASA/Goddard Space Flight Center, LASP)