| NOAA-4 | |
| Mission Type: | Weather |
| Operator: | NOAANASA |
| Cospar Id: | 1974-089A[1] |
| Satcat: | 7529 |
| Mission Duration: | 4 years |
| Launch Mass: | 339.7kg (748.9lb) |
| Launch Date: | UTC[2] |
| Launch Rocket: | Delta 2310 D104 |
| Launch Site: | Vandenberg SLC-2W |
| Disposal Type: | Decommissioned |
| Orbit Epoch: | December 8, 2013, 12:44:30 UTC[3] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Sun-synchronous |
| Orbit Periapsis: | 1451km (902miles) |
| Orbit Apoapsis: | 1465km (910miles) |
| Orbit Inclination: | 101.46 degrees |
| Orbit Period: | 114.91 minutes |
| Apsis: | gee |
| Instruments: | VHRR, VTPR, SR |
| Programme: | ITOS |
| Previous Mission: | NOAA-3 |
| Next Mission: | NOAA-5 |
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 was launched on a Delta rocket on November 15, 1974. The launch carried two other satellites: AMSAT-OSCAR 7 and Intasat.
It remained operational for 1463 days until it was deactivated by NOAA on November 18, 1978.