TIROS-7

TIROS-7
	TIROS-7 satellite.
Mission type	Weather satellite
Operator	NASA
COSPAR ID	1963-024A
SATCAT no.	604
Spacecraft properties
Spacecraft type	TIROS
Manufacturer	RCA / GSFC
Launch mass	134.7 kilograms (297 lb)
Dimensions	1.07 m × 0.56 m (3.5 ft × 1.8 ft)
Start of mission
Launch date	June 19, 1963, 09:50 UTC
Rocket	Thor-Delta B 359/D-19
Launch site	Cape Canaveral LC-17B
End of mission
Last contact	June 3, 1968
Decay date	June 3, 1994
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Eccentricity	0.001995
Perigee altitude	621 kilometers (386 mi)
Apogee altitude	649 kilometers (403 mi)
Inclination	58.23°
Period	97.40 minutes
Epoch	June 19, 1963
Instruments
	Low Resolution Omnidirectional Radiometer; Scanning Radiometer; Langmuir probe; Television Camera System
	TIROS ← TIROS-6 TIROS-8 →

TIROS-7 (also called TIROS-G or A-52) was a spin-stabilized meteorological satellite. It was the seventh in a series of Television Infrared Observation Satellites.

Launch

TIROS-7 was launched on June 19, 1963, by a Thor-Delta rocket from Cape Canaveral Air Force Station, Florida, United States. The spacecraft functioned nominally until June 3, 1968. It reentered the atmosphere after exactly 26 years on June 3, 1994. The satellite orbited the Earth once every 1 hour and 37 minutes, at an inclination of 58.2°. Its perigee was 621 kilometers (386 mi) and apogee was 649 kilometers (403 mi).^[1]

Mission

TIROS 7 was a spin-stabilized meteorological spacecraft designed to test experimental television techniques and infrared equipment. The satellite was in the form of an 18-sided right prism, 107 cm in diameter and 56 cm high. The top and sides of the spacecraft were covered with approximately 9000 1-by 2-cm silicon solar cells. It was equipped with 2 independent television camera subsystems for taking cloudcover pictures, plus an omnidirectional radiometer and a five-channel scanning radiometer for measuring radiation from the earth and its atmosphere. The satellite spin rate was maintained between 8 and 12 rpm by use of five diametrically opposed pairs of small, solid-fuel thrusters.

A magnetic attitude control device permitted the satellite spin axis to be oriented to within 1 to 2 deg of a predetermined attitude. The flight control system also optimized the performance of the solar cells and TV cameras and protected the five-channel infrared radiometer from prolonged exposure to direct sunlight. The spacecraft performed normally until December 31, 1965, and sporadically until February 3, 1967. TIROS-7 was operated for an additional 1.5 years to collect engineering data. It was deactivated on June 3, 1968.^[3]

On June 3, 1994, it was destroyed by being incinerated in the Earth's atmosphere.

References

^ ^a ^b ^c ^d ^e ^f ^g ^h "TIROS 6". National Space Science Data Center Master Catalog. NASA Goddard Space Flight Center. Retrieved June 4, 2018. This article incorporates text from this source, which is in the public domain.
^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved June 4, 2018.
^ "TIROS 7 (1963-024A)". NASA Goddard Space Flight Center. Retrieved June 4, 2018.