Editing Explorers Program (section)

=== Medium-Class  (MIDEX) ===
{| class="wikitable"
|+List of MIDEX missions<ref>{{cite web |url=http://explorers.gsfc.nasa.gov/midex.html |title=Explorers Program |website=explorers.gsfc.nasa.gov |access-date=8 April 2016 |archive-url=https://web.archive.org/web/20160323014953/http://explorers.gsfc.nasa.gov/midex.html |archive-date=23 March 2016 |url-status=dead}} {{PD-notice}}</ref><ref name=":0" /><ref>{{cite web |url=https://explorers.larc.nasa.gov/MIDEX/MIDEX.html |title=Medium-class Explorers (MIDEX) |publisher=Explorers.larc.nasa.gov |access-date=28 April 2018}} {{PD-notice}}</ref> 
|-
! Name
! MIDEX<br/>number
! Explorer<br/>number
! Launch (UTC)
! Status
|-
| [[Rossi X-ray Timing Explorer|RXTE]]
| 
| Explorer-69
| 30 December 1995
| Ended in 2012 / Reentered on 30 April 2018 
|-
| [[Advanced Composition Explorer|ACE]]
| 
| Explorer-71
| 25 August 1997
| {{success|'''Operational'''}}
|-
| [[Far Ultraviolet Spectroscopic Explorer|FUSE]]
| MIDEX-0
| Explorer-77
| 23 June 1999
| Ended in 2007
|-
| [[IMAGE (spacecraft)|IMAGE]]
| MIDEX-1
| Explorer-78
| 25 March 2000
| Lost contact in 2005. Partial contact reestablished in January 2018
|-
| [[Wilkinson Microwave Anisotropy Probe|WMAP]]
| MIDEX-2
| Explorer-80
| 30 June 2001
| Ended in 2010
|-
| [[Neil Gehrels Swift Observatory|Swift]]
| MIDEX-3
| Explorer-84
| 20 November 2004
| {{success|'''Operational'''}}
|-
| [[Full-sky Astrometric Mapping Explorer|FAME]]
| MIDEX-4
| {{center|—}}
| ''Scheduled for 2004''
| Cancelled in 2002 (cost)
|-
| [[THEMIS (satellite)|THEMIS]] A
| MIDEX-5A
| Explorer-85
| 17 February 2007
| {{success|'''Operational'''}}
|-
| [[THEMIS (satellite)|THEMIS]] B
| MIDEX-5B
| Explorer-86
| 17 February 2007
| {{success|'''Operational'''}}
|-
| [[THEMIS (satellite)|THEMIS]] C
| MIDEX-5C
| Explorer-87
| 17 February 2007
| {{success|'''Operational'''}}
|-
| [[THEMIS (satellite)|THEMIS]] D
| MIDEX-5D
| Explorer-88
| 17 February 2007
| {{success|'''Operational'''}}
|-
| [[THEMIS (satellite)|THEMIS]] E
| MIDEX-5E
| Explorer-89
| 17 February 2007
| {{success|'''Operational'''}}
|-
| [[Wide-field Infrared Survey Explorer|WISE / NEOWISE]] 
| MIDEX-6
| Explorer-92
| 14 December 2009
| Mission operations Completed on 31 July 2024.<ref>{{Cite web|url=https://www.nasa.gov/missions/neowise/nasas-neowise-infrared-heritage-will-live-on/|title=NASA’s NEOWISE Infrared Heritage Will Live On - NASA|date=1 July 2024}}</ref> Reentered on 2 November 2024

|-
| [[Transiting Exoplanet Survey Satellite|TESS]]
| MIDEX-7
| Explorer-95
| 18 April 2018
| {{success|'''Operational'''}}
|-
| [[Ionospheric Connection Explorer|ICON]]
| MIDEX-8
| Explorer-96
| 11 October 2019 
| {{success|'''Operational'''}}
|-
| [[SPHEREx]]
| MIDEX-9<!--The sequential number, but needs a reference-->
| 
| 12 March 2025 
|  {{success|'''Operational'''}}
|-
| [[Multi-slit Solar Explorer|MUSE]]
| MIDEX-10<!--The sequential number, but needs a reference-->
| 
| 2027 
| {{pending|In development}}
|-
| [[HelioSwarm]]
| MIDEX-11<!--The sequential number, but needs a reference-->
| 
| 2028 
| {{pending|In development}}
|-
| [[UVEX]]
| MIDEX-12<!--The sequential number, but needs a reference-->
| 
| 2030 
| {{pending|In development}}
|}