Iridium 77
 Iridium satellite, constructed entirely from spares and donated by Motorola to the National Air and Space Museum. | |
| Mission type | Communications |
|---|---|
| Operator | Iridium |
| COSPAR ID | 1998-051E |
| SATCAT no. | 25471 |
| Mission duration | 19 years |
| Spacecraft properties | |
| Spacecraft type | Iridium |
| Manufacturer | Motorola |
| Start of mission | |
| Launch date | September 8, 1998, 21:13:00 UTC |
| Rocket | Delta II 7920-10C |
| Launch site | Vandenberg SLC-2W |
| Contractor | Iridium |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Polar Orbit |
| Eccentricity | 0.00145 |
| Periapsis | 520 km |
| Apoapsis | 540 km |
| Inclination | 86° |
| Period | 95 minutes |
| Epoch | 1998-09-08 |
Iridium 77 was a communications satellite which was part of a satellite constellation known as Iridium, named after the 77th chemical element of the periodic table, iridium. It was owned and funded by Iridium, a communications company.
Network[edit]
Iridium 77 is a part of a space-based communications system called Iridium. Conceived, designed, and built by Motorola, the Iridium system provides wireless, mobile communications through a network of 66 satellites in polar, low-Earth orbits. Inaugurated in November 1998, under the auspices of Iridium LLC, this complex space system allowed callers using hand-held mobile phones and pagers to communicate anywhere in the world—a first in the history of telephony.
Overview[edit]
Launch[edit]
It was launched by Delta II 7920 from Vandenberg Air Force Base on 8 September 1998 at 21:13:00 UTC[1] along with four other satellites, all of which were Iridium satellites.
Features[edit]
Iridium 77 is 3-axis stabilized, with a hydrazine propulsion system. It has 2 solar panels with 1-axis articulation. The system employs L-Band using FDMA/TDMA to provide voice at 4.8 kbit/s and data at 2.4 kbit/s with 16 dB margin. The satellite has 48 spot beams for Earth coverage and uses Ka-Band for crosslinks and ground commanding.[2]
See also[edit]
Other articles of the topic Spaceflight : Universe
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References[edit]
- ↑ "Iridium 77". nssdc.gsfc.nasa.gov. NASA. 16 August 2013. Retrieved 30 March 2014.
- ↑ "Iridium 77". nssdc.gsfc.nasa.gov. NASA. 16 August 2013. Retrieved 30 March 2014.
Template:Orbital launches in 1998
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