Uosat 12

Also called UO-36 and UoSAT-OSCAR-36

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General

Designation	25693 / 99021A
Launch date	21 Apr 1999 at 05:00 UT
Country of origin	United Kingdom
Mission	Telecommunications and Remote sensing
Perigee/Apogee	650 km
Inclination	65°
Period	97.8 min
Launch vehicle	Dnepr #1

Note: there is a confusion about the object number. At launch 25694 reflected the actual satellite.

Estimate cost: $9 million ?

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External resources

http://www.ee.surrey.ac.uk/EE/CSER/UOSAT/missions/uo12/

sat-index articles

Technical data

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Specifications

Prime contractor	SSTL
Platform	new SSTL platform
Mass at launch	300-350 kg
Mass in orbit
Dimension
Solar array
Stabilization
DC power
Design lifetime

UoSAT-12 carries a number of imaging payloads (Earth Imaging System;up to 10 meter resolution). It carries a propulsion system for orbital housekeeping experiments. The S-band downlink can run at speeds up to 1Mb/s for downloading imaging data.

Equipped with 2 cameras (10 m resolution panchromatic, 40 m multispectral). CCDs are from Eastman Kodak. Also has a colour wide angle camera.

telemetry: 437.400 MHz

UoSAT-12 carries a newly developed Space GPS receiver, the SGR, that is designed to provide an experimental testbed for orbit and attitude determination. It has 5 antennas to accurately calculate the spacecraft attitude through applying interferometry techniques to the phase difference measurements.

Resistojet is a new propulsion technology on-board. Nitrous oxide is heated by an electrical element powered by the spacecraft's batteries. The thrust from the Resistojet can be used to adjust the spacecraft's orbit. A 60-minute Resistojet firing period will raise the 650km orbit of the spacecraft by 3km. UoSAT-12 carries 2.5kg of nitrous oxide, sufficient for 14 hours running, in an expulsion system developed for Surrey in collaboration with Polyflex Aerospace of Cheltenham, UK.

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Merlion payload

For use of the Nanyang Technological University (NTU), Singapore. Aim is to help develop a future LEO equatorial amateur radio system. The payload consist of an L-band receive and S-band transmit transponder. Uplink: 1265 MHz, Downlink: 2420 MHz Output power: 7 W

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