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- 50992afe-f79e-47fc-a1a2-126dc2c42c9a definition "The ESSA-4 satellite replaced ESSA-2 and provided direct readout cloud-cover photography to ground stations worldwide using APT. The spacecraft was an 18-sided polygon, 42 inches in diameter, 22 inches high and weighed 290 pounds; it was made of aluminum alloy and stainless steel, then covered with 9100 solar cells. The solar cells served to charge the 63 nickel-cadmium batteries. The two cameras were mounted 180-degrees opposite each other along the side of the cylindrical craft. The 'cartwheel' configuration of the TIROS-9 was selected as the orbital configuration of the ESSA satellites. Therefore, a camera could be pointed at some point on Earth every time the satellite rotated along its axis. The spacecraft operating system was the same as on the TIROS-9. The craft was placed in its planned Sun-synchronous 101-degree inclination retrograde orbit. The APT system was designed to transmit an image every 352 seconds, each photo covering a 2000-square mile area with 2-mile resolution. ESSA-4 was able to transmit two to three images daily to individual ground stations regardless of their location. ESSA-4 Stats: Launch Date: January 26, 1967 Operational Period: 465 days until deactivated by NASA on May 5, 1968 Launch Vehicle: Thrust Augmented Three-Stage Delta Launch Site: Vandenberg Air Force Base, CA Type: Weather Satellite" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a id "1653321" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_id 3466eed1-2fbb-49bf-ab0b-dc08731d502b @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_id 65cb3e7c-d4d8-46df-a5fc-aec63e58e8df @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_id b39a69b4-c3b9-4a94-b296-bbbbe5e4c847 @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_id f3261de5-34c1-4980-af22-f9d7e7206d12 @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_label "Earth Observation Satellites" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_label "Environmental Science Services Administration (ESSA)" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_label "Platforms" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a path_label "Space-based Platforms" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a prefLabel "ESSA-4" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a reference "https://science.nasa.gov/missions/essa" @default.
- 50992afe-f79e-47fc-a1a2-126dc2c42c9a tag "Platforms" @default.