|IMAGE / MIDEX-1||Swift / MIDEX-3|
Below is a list of Medium-class EXplorer (MIDEX) series satellites, including launch dates and links to information on the satellites. If readers know of additional information, please contact the authors using the e-mail addresses at the bottom of this page.
Since all MIDEX-series satellites have other names as well, launch covers and other postal items for these satellites are found under those other names.
|Satellite||Launch Date||Other Name||Mission or Purpose||Type/Discipline|
|Medium-class EXplorer (MIDEX)|
|MIDEX-(-2)||1995-12-30||XTE/ RXTE / Explorer-69||X-ray observations||scientific/research|
|MIDEX-(-1)||1997-08-25||ACE / Explorer-71||particle observations||scientific/research|
|MIDEX-0||1999-06-23||FUSE / Explorer-77||ultraviolet space observatory||scientific/research|
|MIDEX-1||2000-03-25||IMAGE / Explorer-78||determine the directly driven response of the magnetosphere to solar wind changes||scientific/research|
|MIDEX-2||2001-06-30||WMAP / Explorer-80||anisotophy of the microwave background radiation (astronomy mission)||scientific/research|
|MIDEX-3||2004-11-20||Swift / Explorer-84||multiwavelength observatory dedicated to the study of gamma-ray bursts||scientific/research|
|MIDEX-4||Canceled||FAME||space astrometry mission||astronomical/telescope|
|MIDEX-5A/5E||2007-02-17||THEMIS / Explorer-85/89||magnetospheric substorm instability||scientific/research|
|MIDEX-6||2009-12-14||WISE / NGSS / NEOWISE / Explorer-92||all-sky survey (astronomy mission)||astronomical/telescope|
|MIDEX-7||2018-04-18||TESS / Explorer-95||all-sky survey to discover transiting exoplanets||astronomical/telescope|
(The link below leads to information sources that are maintained by others. They are not part of this Website.)
Back to Un-Manned Satellite Philately.