NOAA-4

NOAA-4, also known as ITOS-G was a weather satellite operated by the National Oceanic and Atmospheric Administration (NOAA).^[4] It was part of a series of satellites called ITOS, or improved TIROS.^[5]

NOAA-4 images of cyclone Tracy

NOAA-4

Illustration of the NOAA 4 (ITOS G) satellite
Mission type	Weather
Operator	NOAA / NASA
COSPAR ID	1974-089A[1]
SATCAT no.	7529
Mission duration	4 years
Spacecraft properties
Launch mass	339.7 kilograms (749 lb)
Start of mission
Launch date	November 15, 1974, 17:11:00 (1974-11-15UTC17:11Z) UTC[2]
Rocket	Delta 2310 D104
Launch site	Vandenberg SLC-2W
End of mission
Disposal	Decommissioned
Deactivated	November 18, 1978 (1978-11-19)
Orbital parameters
Reference system	Geocentric
Regime	Sun-synchronous
Perigee altitude	1,451 kilometers (902 mi)
Apogee altitude	1,465 kilometers (910 mi)
Inclination	101.46 degrees
Period	114.91 minutes
Epoch	December 8, 2013, 12:44:30 UTC[3]
Instruments
VHRR, VTPR, SR
ITOS ← NOAA-3 NOAA-5 →

NOAA-4 was launched on a Delta rocket on November 15, 1974. The launch carried two other satellites: AMSAT-OSCAR 7 and Intasat.^[2]

It remained operational for 1463 days until it was deactivated by NOAA on November 18, 1978.