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 SCD-1, 1993-009B - The Brazillian SCD-1 (Satellite de Coleta de datos (Data Collectioin Satellite) was
launched for INPE on a Pegasus launcher from KSC together with the OXP-1 microsatellite,
into a 722x787km orbit inclined at 25 degrees on the 9th February 1993. The satellite
weighed 115kg, and is octagonal in shape with 8 solar panels delivering 110W, measuring 1m
diameter and 1.45m high. The NiCd battery capacity is 8Ah. It is spin stabilised, and
employs magnetorquers, a nutation damper, sun sensors and magnetometers. It carries an ESA
standard S-band TT&C system with two antennas to provide an omnidirectional pattern,
and dual redundant on-board computers. The payload is a VHF and UHF data collection
payload for over 30 environmental monitors across Brazil. The monitors measure cloud
cover, rain fall, flood and tide levels and air quality. A solar cell experiment is also
carried. Design life time was two years, but it was still reported operational in 1998,
although the batteries were showing signs of degradation.
- ASTRO-D,
1993-011D
- A 420kg minisatellite launched on M32S-2 on the 20th February 1993 from Kagoshima. The
spacecraft was placed into a 539x646km orbit inclined at 31.1deg, and observes X-rays. It
was renamed ASCA (ASUKA) after launch.
- ALEXIS,
(P89-1B), 1993
- A 113.5kg minisatellite (picture1, picture2) launched on Pegasus on the 25th April 1993 into a
778km polar orbit. During deployment from the launcher, a solar panel was damaged,
resulting in a 2 month period before the spacecraft was stabilised and sun-pointing.
It was built for DOE by AeroAstro, and Los Alamos National Laboratory built the payload.
The payload weighs 45kg. Its power system delivers 50W to the payload, with 300W peak
power , and employs 4 batteries of 23 NiCd cells, and Si solar cell panels. It carries 12
coarse and fine sun-sensors, IR horizon crossing sensor and Magnetometer providing
0.1degree attitude accuracy, and spins about the sun-angle with the X-ray imaging
telescopes opposite. It also carries three 80C86 processors, plus additional procesor in
payload sophisticated intelligent power systems. Its uplink rate is 9600bps and downlink
rate 750kbps. It is operated from an 1.8m dish at LANL. The satellite is reported to have
cost $3.5m in 1993. The satellite was designed for a 6 month life time, but was reported
to be working well in mid 1997.
[1] 11th AIAA/USU 1997, SSC97-IV-3, "Alexis, the little
satellite that could - 4 years later", D.Roussel-Dupré et all.
More...
- [Alexis at LANL]
- Cosmos
2245-2250, 1993-030A-F
- A multiple launch of an Tsyklon from Plesetsk Cosmodrome on the 11th May 1993 put six
spacecraft into a 1415km orbit inclined at 82.6 degrees, The spacecraft form part of the
military constellation for the Russian Federation Ministry of Defense (MO RF). The
spacecraft use the STRELA-3 bus, weigh 231kg each and are designed for a five year
lifetime by NPO Applied Mechanics (NPO Prikladnoi Mekhaniki of Krasnoyarsk, Russia) for
SMOLSAT (Russia). The spacecraft wil provide military services of data transfer and photo
reconnoissance.
- ARSENE,
1993-031B.
- Arsene was designed and built by the French space agency CNES's radio amateur group (RACE),
and was
launched by the Ariane V56 launcher alongside ASTRA-1C, a TV satellite, into Geostationary
Transfer Orbit (GTO) (223 x 36075km, 5deg) on the 12th May 1993 00:56:32 GMT .
The spacecraft carried a VHF/UHF and a UHF/S-band transponder. A picture shows the hexagonical cylinder which measures 785mm in
diameter and weighs 154kg (74kg propellant); at that time the largest
amateur satellite launched. GaAs solar panels were used provided by the
Italian space agancy (ASI). Following launch it was found that the VHF
uplink receiver had stopped functioning, and the french DGE 10m dish station
at CEM near Toulon was made available. It allowed the mission to be
recovered using UHF uplink and S-band downlink to fire the SEP Mars apogee
kick-motor (15kN thrust) on the 13th orbit placing it into a 17,200x36,830km
orbit. The spacecraft was used by amateur across the world, but suffered finally stopped functioning
on the 6th September 1993 with a UHF uplink failure and two days later with
a failure of the remaining S-band downlink. It is postulated that the VHF
receiver failed due to a cable break at the low-noise amplifier, and that
the S-band downlink failed due to overheating.
[Logo][Arsene at
AMSAT-F RACE]
References
[1] Corresepondence, P.Jung, JBIS, 3Aug 2001.
- Cosmos
2252-2257, 1993-038A-F
- A multiple launch of an Tsyklon from Plesetsk Cosmodrome on the 24th June 1994 put six
spacecraft into a 1415km orbit inclined at 82.6 degrees, The spacecraft form part of the
military constellation for the Russian Federation Ministry of Defense (MO RF). The
spacecraft use the STRELA-3 bus, weigh 231kg each and are designed for a five year
lifetime by NPO Applied Mechanics (NPO Prikladnoi Mekhaniki of Krasnoyarsk, Russia) for
SMOLSAT (Russia). The spacecraft wil provide military services of data transfer and photo
reconnoissance.
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