This page contains philatelic information on the Mars Observer 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.
The use of the MO acronym/initialism is not recommended, to avoid confusing Mar Observer with Mars Odyssey.
(including anniversary-of-launch covers, and launch-related event covers)
|Other postal items
(stamps, souvenir sheets, aerogrammes, postal cards, etc.)
|Mars Observer||Mars Observer||Mars Observer|
Below is a list of Mars Observer satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
|Country||Catalog Number||Type of Item||Year of Issue||Notes on Content|
|Comoro Islands||784 (Mi990)|
|1992||"Mars Observer", but solar panels have a different design (on stamp), also solar panels folded (in upper margin)|
|Comoro Islands||784b (BL367)|
|On stamp and in (upper) margin of SS1 (784)|
On stamp and in (upper) margin of imperforate SS1 (i784)
|Comoro Islands||787a (Mi990+992-993)||On one of MS3 (784+786-787)|
|Congo (Republic)||922 (Mi1277A)|
|One of MS3 (924b (922-924)) (Mi1277A-1279A)|
One of imperforate MS3 (i924b (i922-i924)) (Mi1277B-1279B)
|Congo (Republic)||922a (BL73)||SS1 (922)|
|Ivory Coast||Unknown a (Mi?)||One of MS4 (a-d)||2012||"Mars Observer"|
|Malagasy Republic||1536f (Mi2478)|
|One of MS6 (1536 (a-f)) (Mi2473-2478)|
One of imperforate MS6 (i1536 (a-f))
|Malagasy Republic||1536 fdc||MS6 on FDC|
|On stamp of SS1|
On stamp of imperforate SS1
|St. Vincent Grenadines||961 (BL120)||SS1||1992||"Mars Observer"|
|United States||None||Cachet on cover||1992||"Mars Observer"|
|United States||None||(Mission patch) cachet on cover||1993||"Mars Observer" patch|
|United States||None||(Parforex Station) cancel on cover||1993||"Mars Observer"|
|United States||None||(Parforex Station) cancel on cover (ATA Space Unit cachet)||1993||"Mars Observer"|
Below is a list of Mars Observer satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).
|Country||Cancel Date||Cancel Location||Type of Item||Notes on Content|
|1992-09-25: Mars Observer|
|United States||1992-09-25||Kennedy Space Center FL||(NASA mission patch) cachet on cover||Mars Observer launch|
|Australia||1992-09-28||Canberra ACT||(Space Voyage) cachet on cover||Mars Observer launch|
|Australia||1992-09-28||Parkes NSW||(CSIRO) cachet on cover||Mars Observer launch|
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