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Injun, SolRad, GEOS,
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Injun-3 | ISEE-3 |
This page contains reference images for Injun, SolRad (Solar Radiation), GEOS (Geodetic Earth Orbiting Satellite (GEOS-1 and 2) or Geodynamics Experimental Ocean Satellite (GEOS-3)), and ISEE (International Sun-Earth Explorer) / ICE (International Cometary Explorer) series satellites. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.
These series are related to the Explorer series because some of the satellites had Explorer names and numbers as well. In particular, the following satellite names and numbers were synonymous:
Injun | SolRad | GEOS | ISEE |
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Injun-4 = Explorer-25 Injun-5 = Explorer-40 Injun-6 = Explorer-52 |
SolRad-8 = Explorer-30 SolRad-9 = Explorer-37 SolRad-10 = Explorer-44 |
GEOS-1 = Explorer-29 GEOS-2 = Explorer-36 |
ISEE-1 = Explorer-56 ISEE-3/ICE2 = Explorer-59 |
Launch information (found elsewhere) |
Reference images (immediately below) |
Launch covers (including anniversary-of-launch covers, and launch-related event covers) (found elsewhere) |
Other postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.) (found elsewhere) |
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Injun | Injun | Injun | Injun |
SolRad | SolRad | SolRad | SolRad |
GEOS (USA)1 | GEOS (USA)1 | GEOS (USA)1 | GEOS (USA)1 |
ISEE / ICE2 | ISEE / ICE2 | ISEE / ICE2 | ISEE / ICE2 |
Satellite(s) | Launch Date(s) | Reference Image(s) |
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Injun | ||
Injun-1 | 1961-06-29 |
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Injun-2 | 1962-01-24 | ![]() |
Injun-3 | 1962-12-13 | ![]() |
Injun-4 / Explorer-25 (IE-B) | 1964-11-21 |
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Injun-5 (Injun-C) / Explorer-40 (IE-C) | 1968-08-08 |
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Injun-6 (Injun-F) / Explorer-52 (IE-D) / Hawkeye | 1974-06-03 |
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Satellite(s) | Launch Date(s) | Reference Image(s) |
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SolRad / GRAB / GREB | ||
SolRad-1 / GRAB-1 | 1960-06-22 |
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SolRad-2 / GRAB-(2) [failed] | 1960-11-30 | |
SolRad-3 / GRAB-2 | 1961-06-29 |
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SolRad-4A / GRAB-(3a) [failed] | 1962-01-24 | No image available |
SolRad-4B / GRAB-(3b) [failed] | 1962-04-26 | No image available |
SolRad-5 / GRAB | Never launched | No image available |
SolRad-6 (carried by Poppy-2A) [partial failure] | 1963-06-15 | No image available |
SolRad-7A (carried by Poppy-3A) | 1964-01-11 | No image available |
SolRad-7B (carried by Poppy-4A) | 1965-03-09 | No image available |
SolRad-8 / Explorer-30 (SE-A) | 1965-11-19 | ![]() |
SolRad-9 / Explorer-37 (SE-B) | 1968-03-05 |
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SolRad-10 / Explorer-44 (SE-C) | 1971-07-09 | ![]() |
SolRad-11A, SolRad-11B | 1976-03-14 | ![]() |
SolRad-11C | Never launched | No image available |
Satellite(s) | Launch Date(s) | Reference Image(s) |
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GEOS (USA)1 | ||
GEOS-1 (GEOS-A) / Explorer-29 GEOS-2 (GEOS-B) / Explorer-36 | 1965-11-06 1968-01-11 |
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PAGEOS | 1966-06-23 | ![]() |
GEOS-3 (GEOS-C) | 1975-04-09 | ![]() |
Satellite(s) | Launch Date(s) | Reference Image(s) |
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ISEE / ICE2 | ||
ISEE-1 (ISEE-A) / Explorer-56 | 1977-10-22 |
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ISEE-2 (ISEE-B) | 1977-10-22 |
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ISEE-3 (ISEE-C) / Explorer-59 / ICE2 | 1978-08-14 |
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1This checklist includes the USA GEOS series only, not the ESA-GEOS series.
2Explorer-59 / ISEE-3 was renamed ICE (International Cometary Explorer) in 1983.
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