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Chandra X-ray Observatory
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| CXO | CXO (patch) |
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Chandra X-ray Observatory
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| CXO | CXO (patch) |
This page contains philatelic information on the Chandra X-ray Observatory (CXO or CXRO) 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.
CXO was initially named the Advanced X-ray Astrophysics Facility (AXAF).
CXO was re-named in honor of the Nobel Prize winning physicist S. Chandrasekhar (1910–1995).
CXO is one of four NASA "Great Observatories", along with the Hubble Space Telescope (HST), the Compton Gamma Ray Observatory (CGRO), and the Spitzer Space Telescope (SST).
| 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) |
|---|---|---|
| Chandra / CXO | Chandra / CXO | Chandra / CXO |
| Chandra (on other than Chandra launch covers) |
Below is a list of Chandra / CXO satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
| Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
|---|---|---|---|---|
| Chandra / CXO | ||||
| Antigua and Barbuda | 2244c (Mi2930) i2244c | One of MS6 (2244 (a-f)) (Mi2928-2933) One of imperforate MS6 (i2244 (a-f)) | 1999 | Chandra/CXO/"AXAF" in text, but Hubble/HST depicted) |
| Barbuda | 1791c (Mi2390) | One of MS6 (1791 (a-f)) (Mi2388-2393), Antigua and Barbuda 2244c overprinted | 2000 | Chandra/CXO/"AXAF" in text, but Hubble/HST depicted) |
| Chad | 435 (Mi954A) i435 (Mi954B) | Imperforate | 1983 | (possible) early-design Chandra/CXO1 (depicted with Space Shuttle) |
| Chad | 435a (BL145A) i435a (BL145B) | On stamp of SS1 (435) On stamp of imperforate SS1 (i435) | ||
| Chad | 439b (Mi953A-958A) i439b (Mi953B-958B) | On one of MS6 (434-439) On one of imperforate MS6 (i434-i439) | ||
| Congo (People's Republic) | 582 (Mi807A) i582 (Mi807B) | Imperforate | 1981 | (possible) early-design Chandra/CXO1 (depicted with Space Shuttle Columbia) |
| Congo (People's Republic) | 582 ds | Imperforate deluxe sheet (582) | ||
| Congo (Democratic Republic) | Mi2191A-2193A_ms3_vert Mi2191B-2193B_ms3_vert | In (right) margin of MS3 (Mi2191A-2193A) vertical In (right) margin of imperforate MS3 (Mi2191B-2193B) vertical | 2013 | "Chandra" (X-ray Obervatory) |
| Congo (Democratic Republic) | Mi2191A-2193A_ms3_horiz Mi2191B-2193B_ms3_horiz | In (right) margin of MS3 (Mi2191A-2193A) horizontal In (right) margin of imperforate MS3 (Mi2191B-2193B) horizontal | ||
| Gabon | Unknown a (Mi none) | One of MS4 (a-d) [known illegal issue] | 2018 | "STS-93" (CXO implied) |
| Gabon | Unknown a-d fdc | One of four stamps on FDC | ||
| Gambia | 2268f (Mi3703) | One of MS6 (2268 (a-f)) (Mi3698-3703) | 2000 | "Chandra" (X-ray Obervatory) |
| Gambia | 2268f essay | One of MS6 (2268 imperforate essay (a-f)) | ||
| Gambia | 2268 essay fdc | MS6 (2268 imperforate essay) on FDC | ||
| Guinea Republic | B43a (BL332A, Mi1254A) | In (lower-left) margin of SS1 (B43) | 1989 | (early-design) Chandra/CXO (but "Télescope Lyman" (Spitzer) (in text) |
| Guinea Republic | 1936ab (BL_A655) i1936ab | In (upper-left) margin of SS1 (1936a) (Mi3172) In (upper-left) margin of imperforate SS1 (i1936a) | 2001 | |
| Guinea Republic | 2224b (BL none) i2224b | In (upper-right and lower-left) margins of MS4 (4x 2224) In (upper-right and lower-left) margins of imperforate MS4 (4x i2224) | 2003 | |
| Guinea Republic | 2224b fdc | MS4 on FDC | ||
| Guinea Republic | 2225b (BL none) i2225b | In (upper-right and lower-left) margins of MS4 (4x 2225) In (upper-right and lower-left) margins of imperforate MS4 (4x i2225) | ||
| Guinea Republic | 2225b fdc | MS4 on FDC | ||
| Guinea Republic | 2226b (BL none) i2226b | In (upper-right and lower-left) margins of MS4 (4x 2226) In (upper-right and lower-left) margins of imperforate MS4 (4x i2226) | ||
| Guinea Republic | 2226b fdc | MS4 on FDC | ||
| Guinea Republic | 2227b (BL none) i2227b | In (upper-right and lower-left) margins of MS4 (4x 2227) In (upper-right and lower-left) margins of imperforate MS4 (4x i2227) | ||
| Guinea Republic | 2227b fdc | MS4 on FDC | ||
| Guinea Republic | 2228a (BL815A) i2228a (BL815B) | In (upper-right) margin of SS1 (2228) In (upper-right) margin of imperforate SS1 (i2228) | "Chandra X-ray" (Observatory) | |
| Guinea Republic | 2228a fdc | SS1 on FDC | ||
| Guinea Republic | 2228b (BL none) i2228b | In (upper-right and lower-left) margins of MS4 (4x 2228) In (upper-right and lower-left) margins of imperforate MS4 (4x i2228) | ||
| Guinea Republic | 2228b fdc | MS4 on FDC | ||
| Guinea Republic | 2229b (BL none) i2229b (Mi4052B) | In (upper-right and lower-left) margins of MS4 (4x 2229) In (upper-right and lower-left) margins of imperforate MS4 (4x i2229) | ||
| Guinea Republic | 2229b fdc | MS4 on FDC | ||
| Guinea Republic | 2230b (BL none) i2230b | In (upper-right and lower-left) margins of MS4 (4x 2230) In (upper-right and lower-left) margins of imperforate MS4 (4x i2230) | ||
| Guinea Republic | 2230b fdc | MS4 on FDC | ||
| Guinea Republic | 2231b (BL none) i2231b | In (upper-right and lower-left) margins of MS4 (4x 2231) In (upper-right and lower-left) margins of imperforate MS4 (4x i2231) | ||
| Guinea Republic | 2231b fdc | MS4 on FDC | ||
| Guinea Republic | BL967A BL967B | In (upper) margin of SS1 In (upper) margin of imperforate SS1 | 2006 | "Chandra X-ray" (Observatory) |
| Guinea Republic | BL967A fdc | Stamp on FDC | ||
| Guinea Republic | Mi5841A Mi5841B | One of MS6 (Mi5838A-5843A) One of imperforate MS6 (Mi5838B-5843B) | 2008 | "satellite Chandra" |
| Guinea Republic | Mi5838A-5843A_ms6 fdc | MS6 on FDC | ||
| Guinea Republic | Mi5845A-5850A_ms6 fdc | (Multi-color printed) cachet on FDC | 2008 | |
| Guinea Republic | BL1581A BL1581B | On stamp of SS1 On stamp of imperforate SS1 | 2008 | "satellite Chandra" |
| Guinea Republic | BL1581A fdc | SS1 on FDC | ||
| Liberia | 2514d (Mi5363-5365) i2514d | MS6 (2x (2514 (a-c))) Imperforate | 2008 | "Chandra X-ray Observatory" |
| Liberia | 2517 (BL560) i2517 | SS1 Imperforate SS1 | ||
| Liberia | Unknown ms (Mi?) | MS6 (a-f) | 2022 | "Chandra X-ray Observatory" (CXO); (also JWST) |
| Liberia | Unknown ss (BL?) | SS1 | ||
| Madagascar | Unknown d (Mi none) | One of MS4 (a-d) [known illegal issue] | 2019 | "Chandra" (X-ray Obervatory) |
| Madagascar | Unknown ss (BL none) | SS1 [known illegal issue] | ||
| Madagascar | Unknown ss (BL none) | SS1, with perforation variation [known illegal issue] | ||
| Maldive Islands | 3505 (BL864) | In (lower) margin of SS1 | 2015 | "Chandra X-ray Observatory" |
| Maldive Islands | 3505 fdc1 | SS1 and (multi-color printed) cachet on FDC | ||
| Maldive Islands | 3505 fdc2 | SS1 and (multi-color printed) cachet (different) on FDC | ||
| Maldive Islands | 3951 (BL1082) | In (upper-right) margin of SS1 | 2017 | "Chandra X-ray Observatory" (but unknown/fantasy depicted) |
| Maldive Islands | 4027 (BL1135) | In (left) margin of SS1 (Mi7352) | 2018 | CXO (but "China's first X-ray astronomical satellite" (HXMT) in text) |
| Maldive Islands | Mi8498-8501_ms4 | MS4 (Mi8498-8501) | 2019 | "20th anniv. Chandra X-ray Observatory"; also "STS-93" (on 2 stamps of MS4) |
| Maldive Islands | BL1366 | SS1 | ||
| Mozambique | Mi10705-10708_ms4 | MS4 (Mi10705-10708) | 2019 | 20th anniv. launch "Observatório de raios-X Chandra"; depicted with Space Shuttle "Columbia" (on SS1) |
| Mozambique | BL1576 | SS1 (Mi10709) | ||
| Sierra Leone | Mi10964-10967_ms4 | MS4 (a-d) | 2019 | "20th anniv. Chandra X-ray Observatory" |
| Sierra Leone | BL1715 | SS1 | ||
| St. Thomas and Prince Islands | 3020 (BL1149) | In (upper-right) margin of SS1 | 2015 | "Chandra" (X-ray Obervatory) |
| Togo | Unknown ms (Mi?) | MS4 (a-d) and 4 tabs | 2022 | "Télescope spatial Chandra" (X-ray Obervatory) |
| Togo | Unknown ss (BL?) | SS1 | ||
| Togo | Unknown ss (BL?) | SS1 (different) | ||
| Tuvalu | 1073 (Mi1472-1475) | On all stamps and in (upper) margin of MS4 (1073 (a-d)) | 2008 | "Chandra X-ray Observatory" |
| Tuvalu | 1073 fdc | MS4 on FDC | ||
| Tuvalu | 1546d (Mi2779) | One of MS4 (1546 (a-d)) (Mi2776-2779) | 2021 | |
| United States | 1912 fdc (Mi1481 fdc) | (ArtCraft) cachet on FDC | 1981 | (possible) early-design Chandra/CXO1; (see also sets of 1912-1919 FDCs and 1919a items) |
| United States | 1912+1915-1916+1919 fdc (Mi1481+1484-1485+1488 fdc) | (ArtCraft) cachet on FDC (different) | ||
| United States | 1915+1919 fdc1 (Mi1484+1488 fdc1) | (First Rank/Space Voyage blue and red) cachet on FDC (KSC, FL cancel) | ||
| United States | 1915+1919 fdc2 (Mi1484+1488 fdc2) | (First Rank/Space Voyage brown and orange) cachet on FDC (Houston TX cancel) | ||
| United States | 1915+1919 fdc3 (Mi1484+1488 fdc3) | (First Rank/Space Voyage green and orange) cachet on FDC (MSFC, AL cancel) | ||
| United States | 1916 fdc (Mi1485 fdc) | (ArtCraft) cachet on FDC | ||
| United States | None | (Pictorial) cancel | 1999 | Depicted with Space Shuttle Columbia ("STS-93") |
| United States | 3188e fdc (Mi3175 fdc) | (Space Voyage red and tan and brown) cachet on FDC | 1999 | Chandra / "STS-93" |
| United States | 3189i fdc (Mi3233 fdc) | (Space Voyage red and tan and black) cachet on FDC | ||
| United States | 3190a fdc1 (Mi3243 fdc1) | (Space Voyage red and peach and purple) cachet on FDC (Mission Control Station pictorial cancel) | 2000 | |
| United States | 3190a fdc2 (Mi3243 fdc2) | (Space Voyage red and peach and purple) cachet on FDC (STS-103 Station pictorial cancel) | ||
| United States | 3190a fdc3 (Mi3243 fdc3) | (Space Voyage red and peach and black) cachet on FDC (Nassau Bay Branch, Houston TX cancel) | ||
| United States | 3190a fdc4 (Mi3243 fdc4) | (Space Voyage red and pink and purple) cachet on FDC (STS-103 Station pictorial cancel) | ||
| United States | 3190a fdc5 (Mi3243 fdc5) | (STS-93 Station) cancel on FDC (multi-color printed cachet and signature); (see also USA STS-93 launch cover) | ||
| United States | 3191h fdc (Mi3295 fdc) | (Space Voyage red and peach and black) cachet on FDC | ||
| United States | 5075 fdc (Mi5249 fdc) | (?) cachet on FDC | 2016 | "Chandra X-ray Observatory" |
| United States | 5720 fdc (Mi5971 fdc) | (Coverscape) back of FDC, also front | 2022 | "Chandra X-Ray Observatory" |
| Vanuatu | 1123e (Mi1603) | One of MS6 (1123 (a-f)) (BL81, Mi1599-1604) | 2021 | |
1An astronomical/telescope satellite somewhat similar to Chandra/CXO is depicted in an early-design stage, most likely due to the pre-launch date of these items, when the design was not finalized. This design is similar to HST but has solar panels that are perpendicular, rather than parallel, to the spacecraft body.
Below is a list of Chandra / CXO satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).
| Country | Cancel Date | Cancel Location | Type of Item | Notes on Content | |
|---|---|---|---|---|---|
| Chandra / CXO (pre-launch events) | |||||
| United States | 1999-06-07 | Kennedy Space Center FL | (Black rubber-stamp and hand-printed) cachet (and signatures) on cover | STS-93 pre-launch: "rollout" | |
| 1999-07-23: Chandra / CXO (deployed by STS-93) | |||||
| United States | 1999-07-22 | Houston TX | (Green printed) cachet on cover | STS-93 launch | |
| United States | 1999-07-22 | Houston TX | (STS-93 Station) cancel and (multi-color printed) cachet on cover, also insert; (see also USA 3190a fdc) | STS-93 launch | |
| United States | 1999-07-22 | Houston TX | (STS-93 Station) cancel and (gold printed) cachet on cover | STS-93 launch | |
| United States | 1999-07-22 | Houston TX | (STS-93 Station) cancel and (multi-color printed) cachet on (airmail) cover | STS-93 launch | |
| United States | 1999-07-23 | Kennedy Space Center FL (machine cancel) | (Mission patch) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (hand cancel) | (Mission patch) cachet (and signatures) on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (machine cancel) | (Mission patch and black text) cachet on cover, and insert | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (hand cancel) | (Mission patch and black text) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (hand cancel) | (Mission patch and black text) cachet (and signatures) on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Houston TX | (STS-93 Station) cancel and (Colorano silk) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL | (Magenta rubber-stamp and black typed) cachet (and signature) on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Las Cruces NM | (White Sands TDRS Complex) cachet (and signatures) on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Houston TX | (Green rubber-stamp) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Nassau Bay Branch, Houston TX | (Blue and magenta rubber-stamp) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL | (Magenta rubber-stamp) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL | (Cyan mission patch) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL | (Red-brown printed) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL | (Colorano silk) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Houston TX | (STS-93 Station) cancel and (Colorano silk) cachet (different) on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (text cancel) | (Multi-color printed) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Kennedy Space Center FL (pictorial cancel) | (Multi-color printed) cachet on cover | STS-93/Columbia | STS-93 launch; Chandra/CXO deployed |
| United States | 1999-07-23 | Kennedy Space Center FL | (Tiitusville Moonport Stamp Club) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 | Nassau Bay Branch, Houston TX | (NASA photo/sticker) cachet on cover | STS-93 launch; Chandra/CXO deployed | |
| United States | 1999-07-23 1999-07-27 | Kennedy Space Center FL Kennedy Space Center FL | (Cyan mission patch) cachet on cover | STS-93 launch; Chandra/CXO deployed STS-93 landing |
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| United States | 1999-07-23 1999-07-27 | Kennedy Space Center FL (machine cancel) Kennedy Space Center FL (hand cancel) | (Black mission patch) cachet on cover | STS-93 launch; Chandra/CXO deployed STS-93 landing |
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| United States | 1999-07-25 | Nassau Bay Branch, Houston TX | (NASA photo of Shuttle Astronauts and CXO model) cachet on cover | Unknown event (but possibly for the firing of the Shuttle's engines to allow the Midcourse Space Experiment (MSX) satellite to collect ultraviolet, infrared and visible light data on the firing) | |
| United States | 1999-07-26 | Nassau Bay Branch, Houston TX | (Purple rubber-stamp) cachet on cover | Unknown event (but probably for Astronaut Michel Tognini's scientific work with one or more of the payloads for which he was the prime operator) | |
| United States | 1999-07-27 | Kennedy Space Center FL | (Mission patch) cachet on cover, and insert | STS-93 landing | |
| United States | 1999-07-27 | Kennedy Space Center FL | (Titusville Moonport Stamp Club) cachet on cover, and insert | STS-93 landing | |
| United States | 1999-07-27 | Houston TX | (STS-93 Station) cancel and (Colorano silk) cachet on cover | STS-93 landing | |
| United States | 1999-07-27 | Houston TX | (STS-93 Station) cancel and (Colorano silk) cachet (and signature) on cover | STS-93 landing | |
| United States | 1999-07-27 | Houston TX | (Magenta rubber-stamp) cachet on cover | STS-93 landing; also "STARSHINE[-1] overpass" mission patch | |
| United States | 1999-07-27 | Kennedy Space Center FL | (Colorano silk) cachet on cover | STS-93 landing | |
| United States | 1999-07-27 | Kennedy Space Center FL | (Colorano silk) cachet (and signature) on cover | STS-93 landing | |
| Chandra / CXO (anniversaries) | |||||
| United States | 2019-07-23 | Sagamore Beach MA | (Coverscape) cachet on cover | 20th anniv. STS-93 launch; 20th anniv. Chandra/CXO deployed | |
| Chandra (on other than Chandra launch covers) | |||||
| United States | 1983-01-31 | Cape Canaveral FL | (Purple rubber-stamp) cachet on Explorer-1 anniversary cover | (possible) early-design Chandra/CXO1 (depicted with Space Shuttle) | |
| United States | 1986-01-12 1986-01-18 | Cape Canaveral FL Edwards AFB, CA | (Black printed) cachet on STS-32 (61C) launch and Satcom-Ku1 deployed STS-32 (61C) landing cover | (possible) early-design Chandra/CXO1 (depicted with Space Shuttle) | |
1An astronomical/telescope satellite somewhat similar to Chandra/CXO is depicted in an early-design stage, most likely due to the pre-launch date of these items, when the design was not finalized. This design is similar to HST but has solar panels that are perpendicular, rather than parallel, to the spacecraft body.
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