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Track MMS 3 now!
MMS 3 is classified as:

NORAD ID: 40484
Int'l Code: 2015-011C
Perigee: 2,446.8 km
Apogee: 179,572.9 km
Inclination: 47.9 °
Period: 5,040.5 minutes
Semi major axis: 97380 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 40484U 15011C   24171.25001157 -.00000522  00000-0  00000+0 0  9993
2 40484  47.9485  11.2699 9094504 146.6098 338.3638  0.28568830 15361
Source of the keplerian elements: AFSPC