Landsat 7

---

General

Designation	25682 / 99020A
Launch date	15 Apr 1999
Country of origin	United States
Mission	Remote sensing
Perigee/Apogee	705 km sun synchronous (descending node: 10:00 AM)
Inclination	98.2°
Period	99 min (16-day cycle)
Launch vehicle	Delta 2 #268

Launch under the MELVS contract. The satellite will be operated by NASA's Goddard until Oct 2000 and then be transfered to thr US Geological Survey. The entire project is worth $800 million.

On 31 May 2003, the ETM payload suffered a failure with its SLC instrument and stopped producing pictures. Picture taking was resumed in July 2003 to see if they can be used as the failure could not be fixed and appears to be mechanical and permanent. Picture resolution is degraded (25% of data is unusable).

Still operational in 2009.

---

External resources

http://geo.arc.nasa.gov/sge/landsat/l7.html

http://landsat7.usgs.gov/
sat-index articles

Technical data

---

Specifications
Payload

TDRS used for telemetry and command:
Telemetry: 2287.5 MHz (1.216 Mbps or upto 4.864 Mbps in SSA mode)
Command: 2106.4 MHz (125 kbps or upto 1 kbps in SSA mode)
Data: 8212.5 & 8342.5 MHz (150 Mbps each, can be used at the same time)

---