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Iridium 33
Topic: Engineering
From HandWiki - Reading time: 2 min
 A mockup of an Iridium satellite | |
| Mission type | Communication |
|---|---|
| Operator | Iridium Satellite LLC |
| COSPAR ID | 1997-051C |
| SATCAT no. | 24946 |
| Mission duration | 11 years |
| Spacecraft properties | |
| Bus | LM-700A |
| Manufacturer | Lockheed Martin |
| Launch mass | 700 kg |
| Start of mission | |
| Launch date | 14 September 1997, 01:36 UTC |
| Rocket | Proton-K / DM2 |
| Launch site | Baikonur, Site 81/23 |
| Contractor | Khrunichev via International Launch Services |
| End of mission | |
| Destroyed | 10 February 2009, 16:56 UTC Collision with Kosmos 2251 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 779.6 km [1] |
| Apogee altitude | 799.9 km |
| Inclination | 86.4° |
| Period | 100.4 minutes |
| Epoch | 10 February 2009 |
Iridium 33 was a communications satellite launched by Russia for Iridium Communications. It was launched into low Earth orbit from Site 81/23 at the Baikonur Cosmodrome at 01:36 UTC on 14 September 1997, by a Proton-K rocket with a Block DM2 upper stage.[2][3] The launch was arranged by International Launch Services (ILS). It was operated in Plane 3 of the Iridium satellite constellation, with an ascending node of 230.9°.[2]
Mission
Iridium 33 was part of a commercial communications network consisting of a constellation of 66 LEO spacecraft. The system uses L-Band to provide global communications services through portable handsets. Commercial service began in 1998. The system employs ground stations with a master control complex in Landsdowne, Virginia, a backup in Italy, and a third engineering center in Chandler, Arizona.[4]
Spacecraft
The spacecraft was 3-axis stabilized, with a hydrazine propulsion system. It had 2 solar panels with 1-axis articulation. The system employed L-Band using FDMA/TDMA to provide voice at 4.8 kbps and data at 2400 bps with a 16 dB margin. Each satellite had 48 spot beams for Earth coverage and used Ka-Band for crosslinks and ground commanding.[4]
Destruction
On 10 February 2009, at 16:56 UTC, at about 800 km altitude, Kosmos 2251 (1993-036A) (a derelict Strela satellite) and Iridium 33 collided, resulting in the destruction of both spacecraft.[5] NASA reported that a large amount of space debris was produced by the collision, i.e. 1347 debris for Kosmos 2251 and 528 for Iridium 33.[6][7][8][9]
See also
References
- ↑ "Iridium 33 tracking details". https://www.n2yo.com/satellite/?s=24946.
- ↑ 2.0 2.1 Wade, Mark. "Iridium". Encyclopedia Astronautica. http://www.astronautix.com/project/iridium.htm.
- ↑ Wade, Mark. "Proton". Encyclopedia Astronautica. http://www.astronautix.com/lvs/proton.htm.
- ↑ 4.0 4.1 "Iridium 33: Display 1997". NASA. 14 May 2020. https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1997-051C.
This article incorporates text from this source, which is in the public domain.
- ↑ Iannotta, Becky (2009-02-11). "U.S. Satellite Destroyed in Space Collision". Space.com. http://www.space.com/news/090211-satellite-collision.html.
- ↑ "2 orbiting satellites collide 500 miles up". Associated Press. 2009-02-11. https://www.google.com/hostednews/ap/article/ALeqM5grGfFhzFgjxK46MQHTwD1RgRUwCAD969LB802.
- ↑ "Google Earth KMZ file of the debris". John Burns. 2009-03-05. http://www.john.geek.nz/2009/03/satellite-collision-google-earth-kmz-file/.
- ↑ "U.S. Space debris environment and operational updates". NASA. 2011-02-18. http://www.oosa.unvienna.org/pdf/pres/stsc2011/tech-31.pdf. This article incorporates text from this source, which is in the public domain.
- ↑ "Javascript visualisation of Iridium 33 debris". http://stuffin.space/?search=1997-051.
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