brite constellation – 2 years in orbit · 2015-02-10 · professor horst cerjak, 19.12.2005 3...
TRANSCRIPT
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Professor Horst Cerjak, 19.12.20051
BRITE 2014
W.Weiss, R.KuschnigUniversity of Vienna
BRITE Constellation – 2 Years in Orbit
O. Koudelka, M.Unterberger, P.Romano Graz University of Technology
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Professor Horst Cerjak, 19.12.20052
BRITE 2014
Contents
• Scientific Goals• Mission Description• Operations• Scientific Data Collection and Analysis• Summary
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Professor Horst Cerjak, 19.12.20053
BRITE 2014
• First nanosatellite constellation dedicated to an astronomy mission (astereoseismology)
• 5 spacecraft operational in Space• Austria (BRITE-Austria/TUGSAT-1 & UniBRITE)• Poland (BRITE-PL1 „Lem“ & BRITE-PL2 „Heveliusz“)• Canada (BRITE-CAN1 „Toronto“)
BRITE (BRIght Target Explorer)
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Professor Horst Cerjak, 19.12.20054
BRITE 2014
Scientific Goals• Photometric measurement of brightness and
temperature variations of massive luminous stars (up to visual magnitude 4)
• Fastest data cadence: few minutes
• Time base: up to 2 years
• high duty cycle
• 2-colour (blue and red)
• 24° field of view
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Professor Horst Cerjak, 19.12.20055
BRITE 2014
BRITE Flight Model
telescope
star tracker
solar cells
magnetometer
S-band antenna
Size: 20 x 20 x 20 cm
Mass: 6.8 kg
Power: 6…10 W
S-Band downlink (256 kbit/s)
UHF uplink (9.6 kbit/s)
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Professor Horst Cerjak, 19.12.20056
BRITE 2014
Launch
• TUGSAT-1/BRITE-Austria andUniBRITE were launched byPSLV-C20 of ISRO/ANTRIX on 25 February 2013from the Satish DhawanSpace Centre in Sriharikota
• Sun-synchonous LEO orbit
Courtesy: ISRO
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BRITE 2014
Mission Operations
• 14 orbits per day • 3 orbits in morning sequence• 3 - 4 orbits in evening sequence
• Automatic & remote ground stations operations supported
• BRITE-Austria operated from Graz• UniBRITE operated from Toronto
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Professor Horst Cerjak, 19.12.20058
BRITE 2014
Management
• BRITE Executive Science Team (BEST)�Scientists from Austria, Canada, Poland�Defines targets
• Operation teams�Prepare commands for spacecraft, �up- and downloads
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Satellite Performance
• RMS pointing stability in X / Y: 1.6 / 1.5 pixels (2 – 3 pixels)
• Up to 20 subrasters: 32x32 to 24x24 pixels
• Typical 1 sec integrations, stacking available
• CCD deterioration due to radiation -> chopping
Attitude Spacecraft temperature
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BRITE 2014
Raster Photometry
• Raster: 24 x 24 pixels
All 15 rasters during one observation, spacecraft pointing at Orion
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BRITE 2014
Ultrapraecision
from ground in space
11
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BRITE 2014
Observations Planning
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Life Cycle of MatterLife Cycle of Matter
White DwarfsNeutron StarsBlack Holes
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Light Curve for Orion
Gray curve: TUGSAT-1/BRITE-Austria (blue filter)Bllue curve: UniBRITE (red filter)
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Bright Star Bonus� Interferometry
• angular diameter
� Adaptive Optics & Lucky Image
• stellar & debris disks
� Parallax with high accuracy
• linear diameter
� Very high spectral resolution spectroscopy
• stellar fundamental parameters & atmosphere
• (Doppler) surface imaging
� Time resolved spectroscopy
• asteroseismology
� Spectropolarimetry
• magnetic field structures
� Multi-wavelengths options
� ““““Easy”””” access to telescope time
of medium size telescopes
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Summary
• BRITE-Constellation is the world‘s first nanosatellite constellation dedicated to astronomy
• 5 components of BRITE-Constellation operational
• Scientific & technical requirements fully met
• Science fields: 150d in Orion, Centaurus, Perseus, and Vela Pupis.
• Observing program developed till end 2016
• Scientific data analysis under way
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Thank you for your attention!