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MINXSS is no longer on orbit
MINXSS is classified as:

NORAD ID: 41474
Int'l Code: 1998-067HU
Launch date: November 20, 1998
Source: United States (US)
Decay date: 2017-05-05

Uplink (MHz):
Downlink (MHz): 437.350
Beacon (MHz):
Mode: 9600bps GMSK
Call sign: MINXSS
Status: Reentered

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):

Source of the keplerian elements: AMSAT