The BRITE Nanosatellite Constellation
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1 The BRITE Nanosatellite Constellation Otto F. Koudelka Institute of Communication Networks and Satellite Communications TU Graz 1 BRITE (BRIght Target Explorer) Scientific goal: investigation of brightness variations of massive luminous stars with precise star camera Space telescope needed: avoiding interference by Earth atmosphere 2 1
2 SCIENTIFIC GOAL Measurement of brightness variations of luminous stars (magnitude +3.5) by differential photometry Differential measurement made (at least 2 stars in field of view during exposure) Physical properties and processes on these stars (e.g. mass ejection, rotation of star, ) can be derived from these brightness oscillations Recording of time-series ( days) Mission duration: at least 2 years 3 INSTRUMENT Telescope with CCD sensor 2 types of filters: blue and red spectral ranges Type 1: blue filter, type 2: red filter 4 2
3 BRIGHTNESS VARIATIONS Resolution: magnitudes required 5 BRITE CONSTELLATION 6 satellites, operating in pairs red/blue filter instrument 2 Austrian: TUGSAT-1/BRITE-Austria & UniBRITE 2 Polish: BRITE-PL1 (LEM) & BRITE-PL2 2 Canadian: BRITE-CAN 1 & BRITE-CAN 2 6 3
4 TUGSAT-1/BRITE-Austria FLIGHT MODEL magnetometer S-band antenna solar cells telescope star tracker 7 BRITE CHARACTERISTICS Nanosatellite: 20 x 20 x 20 cm Mass: 7 kg Electrical power: 6 11 W Transmit power: 0.5 W Frequency bands: S-band downlink / UHF uplink Data rates: kbit/s downlink, 9.6 kbit/s uplink Science data volume: 2 10 MB / day 8 4
5 ATTITUDE CONTROL SYSTEM Precise alignment of camera to target stars 3 miniature momentum wheels, magnetorquer, sun sensors, magnetometer, star sensor and attitude control computer provide alignment at arc minute level 9 ON-BOARD COMPUTERS Subsystems can be powered/switched off under computer control 3 nearly identical computers on board: housekeeping attitude control instrument 10 5
6 36 solar cells mounted on 6 panels 6 W average 11 W peak POWER SUBSYSTEM Batteries Energy storage during eclipses 2nd battery for redundancy 11 TECHNOLOGY based on pioneering developments by the Space Flight Lab of the University Toronto GNB (generic nanosatellite bus) 12 6
7 FLATSAT TESTS 13 QUALIFICATION TESTS 14 7
8 TESTS OF HARDWARE/SOFTWARE 15 GROUND STATION AND MISSION CONTROL CENTRE GRAZ 3 m tracking antenna for S-Band & UHF bands 16 8
9 GROUND STATIONS Graz, Austria (Control of BRITE-Austria) Vienna, Austria (Control of UniBRITE in 2014) Toronto, Canada (Control of BRITE-CAN) Warsaw, Poland (Control of BRITE-PL) All stations could track and collect data from all BRITE spacecraft (redundancy) Automatic ground station operations Science teams can retrieve verified raw data from servers 17 LAUNCHER TUGSAT-1/BRITE-Austria and UniBRITE will be launched by PSLV-C20 of ISRO/ANTRIX on 25 February 2013 from the Satish Dhawan Space Centre in Sriharikota Sun-synchonous LEO orbit 18 9
10 SPACECRAFT IN LAUNCH TUBE (XPOD) Source: ISRO/SFL/TUG 19 SUMMARY BRITE Constellation will be the world s first nanosatellite constellation dedicated to an astronomy mission Always a pair of satellites will measure in the blue and red spectral ranges, providing not only temporal, but also spectral information on the brightness variations of massive luminous stars 20 10
11 SUMMARY (2) Challenging scientific and technological mission Sustainability: development of a cost-efficient satellite platform for future missions Added value for education: - Training for students, young engineers and scientists - Raising interest of the public for space research and technology 21 SUMMARY (3) Since 28 December 2011 Austria has Space Law implemented Regulating registration, authorisation, liability and space debris mitigation issues BRITE was important stimulus 22 11
12 INTERNATIONAL COOPERATION Canada Austria Poland
13 We are at T 4 days Next week a BRITE future begins! Thank you for your attention! 25 13
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