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MINXSS is classified as:

NORAD ID: 41474
Int'l Code: 1998-067HU
Perigee: 247.5 km
Apogee: 260.9 km
Inclination: 51.6 °
Period: 89.4 minutes
Semi major axis: 6625 km
RCS: Unknown
Launch date: November 20, 1998
Source: United States (US)
Uplink (MHz):
Downlink (MHz): 437.350
Beacon (MHz): 437.347
Mode: 9600bps GMSK
Call sign: MINXSS
Status: Active

MINXSS (The Miniature X-ray Solar Spectrometer) is a 4-year, ~$1 million project to design, build, integrate, test, and operate a 34cm x 10cm x 10cm satellite. Specifically, the intensity of the soft x-ray spectrum from 0.4 keV (30 Å) to 30 keV (0.4 Å) will be measured, with resolution of ~0.15 keV full-width half-max. This region is of particular interest for observations of solar flares and active regions. The MinXSS project heavily involves its graduate student team members with scientists and engineers at the University of Colorado, Boulder and the Laboratory for Atmospheric and Space Physics (LASP). Over 40 graduate students, 3 undergraduate students, and one high school student have worked on MinXSS.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 41474U 98067HU  17119.77981928 +.01063894 +68440-3 +11050-2 0  9995
2 41474 051.6493 240.1539 0010177 328.2009 031.8390 16.09919507054699
Source of the keplerian elements: AFSPC