Mars Climate Orbiter
(MCO) satellite

This page contains philatelic information on the Mars Climate Orbiter (MCO) satellite. Catalog numbers, years of issue, and notes on the satellites featured are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.

Launch information
(found elsewhere)
Launch covers
(including anniversary-of-launch covers, and launch-related event covers)
(farther below)
Other postal items
(stamps, souvenir sheets, aerogrammes, postal cards, etc.)
(immediately below)

Below is a list of Mars Climate Orbiter satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).

CountryCatalog NumberType of ItemYear of IssueNotes on Content
Mars Climate Orbiter (MCO)
Comoro IslandsUnknown d (Mi?)One of MS6 (a-f)2008"Mars Climate" Orbiter
Ivory CoastUnknown a (Mi?)One of MS4 (a-d)2012"Mars Climate Orbiter"
Nevis1215 (BL187)SS12000"Mars Climate Orbiter"
Niger1076c (Mi1910A)
i1076c (Mi1910B)
One of MS9 (1076 (a-i)) (Mi1908-1916)
One of imperforate MS9 (i1076 (a-i))
2001"Mars Climate Orbiter"
Palau501b (Mi1457)One of MS6 (501 (a-f)) (Mi1456-1461)1999"Mars Climate Orbiter" (but Mars Odyssey depicted)1
Palau503 (BL84)SS1"Mars Climate Orbiter"
St. Kitts870c (Mi1370)From MS4 (870 (a-d)) (Mi1368-1371)2014"Mars [Climate] Orbiter" (but Mars Odyssey depicted)1
St. Kitts870d (Mi1371)"Mars Climate" Orbiter
Togo2035e (Mi3320)
One of MS6 (2035 (a-f)) (Mi3316-3321)
One of imperforate MS6 (i2035 (a-f))
2006MCO (but "Odyssey" in text)1

1Mars Climate Orbiter appears quite similar to Mars Odyssey but without an instrumented boom attached to the spacecraft body.

Below is a list of Mars Climate Orbiter (MCO) satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).

CountryCancel DateCancel LocationType of ItemNotes on Content
1998-12-11: Mars Climate Orbiter (MCO)
United States1998-12-11Kennedy Space Center FL(FM?) cachet on coverMCO launch
United States1998-12-11Pasadena CA(Mission Operations Station) cancel and (JPL Stamp Club) cachet on coverMCO launch (but "Mars 98 Climate Observer" and "Mars Surveyor 98" in cachet text), Mars Odyssey depicted (in cancel)
MCO (events)
United States1999-09-23Pasadena CA(JPL Stamp Club) cachet on coverattempted Mars orbit insertion and loss1 (but "Mars 98 Climate Observer" in text)

1The Mars Climate Orbiter (MCO) was lost as it was occulted by Mars (went behind Mars as viewed from Earth). The root cause of the loss was found to be the use of English units for thruster performance data generated by a ground based computer program. This data was used in the construction of trajectory models for the spacecraft, and the modelers assumed the data was in metric units as per the specifications.

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Updated: 2018-01-31