NOAA-4

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

NOAA-4
Spacecraft properties
Illustration of an ITOS series satellite

Mission type	Weather
Operator	NOAA / NASA
COSPAR ID	1974-089A[1]
SATCAT no.	7529
Mission duration	4 years


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

References

"NASA/NSSDC NOAA-4 spacecraft details". Retrieved October 20, 2008.
McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved December 8, 2013.
"NOAA 4 Satellite details 1974-089A NORAD 7529". N2YO. December 8, 2013. Retrieved December 8, 2013.
Wade, Mark. "ITOS". Encyclopedia Astronautica. Archived from the original on September 13, 2008. Retrieved October 20, 2008.

TIROS satellites
TIROS	TIROS-1 TIROS-2 TIROS-3 TIROS-4 TIROS-5 TIROS-6 TIROS-7 TIROS-8 TIROS-9 TIROS-10
TOS	ESSA-1 ESSA-2 ESSA-3 ESSA-4 ESSA-5 ESSA-6 ESSA-7 ESSA-8 ESSA-9
ITOS	TIROS-M NOAA-1 ITOS-B NOAA-2 NOAA-3 NOAA-4 NOAA-5 ITOS-E
TIROS-N	TIROS-N NOAA-6 NOAA-B NOAA-7
Adv. TIROS-N	NOAA-8 NOAA-9 NOAA-10 NOAA-11 NOAA-12 NOAA-13 NOAA-14 NOAA-15 NOAA-16 NOAA-17 NOAA-18 NOAA-19

← 1973 · Orbital launches in 1974 · 1975 →

Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).

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