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Track MMS 4 now!
MMS 4 is classified as:

NORAD ID: 40485
Int'l Code: 2015-011D
Perigee: 2,454.8 km
Apogee: 180,396.4 km
Inclination: 48.2 °
Period: 5,072.8 minutes
Semi major axis: 97796 km
RCS: Unknown
Launch date: March 13, 2015
Source: United States (US)

MMS (Magnetospheric Multiscale) is a Solar-Terrestrial Probe mission comprising four identically instrumented spin-stabilized spacecraft to discover the fundamental physics of magnetic reconnection using Earth's magnetosphere as a laboratory. The MMS spacecraft are being developed at NASA's Goddard Space Flight Center (GSFC) in Greenbelt, Maryland. GSFC is also responsible for the overall management of the MMS mission and mission operations. The mission is to be launched in October 2014 and will have an duration of two years (Prime Mission) + 6 months (launch, checkout, commissioning).
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 40485U 15011D   24175.91667824 -.00000960  00000-0  00000-0 0  9997
2 40485  48.1647  10.9283 9097535 146.8352  95.2427  0.28386868  1349
Source of the keplerian elements: AFSPC