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BRITE Satellites

Cubic form factor (20cm/side) with mass < 8kg Pre-deployed antennas and booms Telescope (Blue and Red): 11 Megapixel CCD Aperture = 3cm FOV = 24  30 arcsec/pixel Three-axis attitude control ( ≈1.5 arcminute stability) UHF and S-Band communication. BRITE Satellites. BRITE Satellites.

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BRITE Satellites

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  1. Cubic form factor (20cm/side) with mass < 8kg Pre-deployed antennas and booms Telescope (Blue and Red): 11 Megapixel CCD Aperture = 3cm FOV = 24 30 arcsec/pixel Three-axis attitude control (≈1.5 arcminute stability) UHF and S-Band communication BRITE Satellites

  2. BRITE Satellites

  3. BRITE Satellites

  4. BRITE Satellites

  5. BRITE Instruments - Telescopes 5 lens system plus filter & baffle RED design BLUE design 24 deg FOV, telecentric low distortion, minimal vignetting

  6. BRITE Detectors KODAKKA11002 good performance at high (+20C) temperatures low power consumption and reasonable price ReadNoise ~15e rms

  7. BRITE - Filters

  8. BRITE – Point Spread Function ZEMAX Model PSF - 5 deg offsets BRITE Blue 0.50 0.73 1.07 1.29 0.83 0.61 0.52 +0.3 +0.2 +0.1 0.0 -0.2 -0.3 -0.1 red: rms scatter in mmag black: CCD distance in [mm] design best focus extra focal intra focal

  9. BRITE Point Spread Function BRITE Blue PSF 5 deg offsets 8 pixels diameter – 80 pixels carry signal~30“/pixel

  10. BRITE – Field Of View 30“/pixel 2670 pixel 4000 pixel

  11. Region of Interest ROI/Raster up to 15 (32x32pixel) ROI/Raster

  12. BRITE Onboard Data Processing

  13. ROI Rnnn X2 Y2 RnnnB2 RnnnB3 RnnnA2 RnnA1 V pix BW pix RnnnB4 RnnnB1 BW pix H pix Y1 X1 BRITE Onboard Data Processing sections: RnnnB1-4 ... backgrounds RnnnA1-2 ... apertures processed data: for each background median and sigma are calculated + the sum of signals values encompassed in the two apertures a total of 10 values BW ... width of background [pixels]

  14. BRITE Photometric Performance mag(V) mag(V) = 0-> 1.3 sec / 14 exp per min scatter mag(V) = 2-> 8.0 sec / 5 exp per min mag(V) = 4-> 50.0 sec / 1 exp per min

  15. BRITE Orbit UniBRITEand BRITE-AUSTRIA will be launched on the same rocket into: • Low Earth Sun-Synchronous Dawn Dusk Orbit • 820 km, LTDN 6am • orbit period ~ 101min SUN

  16. BRITE Launcher Madras

  17. BRITE Ground Stations • Primary Ground Station: IKS – TU Graz • Additional Locations: UTIAS – Toronto Canada TU Wien IfA Uni Wien Minimum Data Rate 2MB per day

  18. BRITE Target Stars • 40 proposals have been submitted • 13 PI‘s and their teams • Austria (13), Australia (1), • Belgium (2), Bulgaria (1), • Canada (4), Croatia (1), • Germany (6), Iran (1), Poland (2), • Spain (1), Switzerland (1), U.K. (3) and USA (3) • O, B and Be stars, beta Cephei stars, hot Supergiants, • delta Scuti variables, gamma Doradus pulsators, • roAp / CP stars, red Giants , eclipsing binaries and more BRITE CANDIDATE TARGET STAR CATALOG BRITE-sky: a target fields evaluations tool

  19. BRITE AO-I Overview • the first announcement of opportunity • was released in Sep 2008 – deadline Nov 2008 • an initial review of the proposals was carried • out in Dec 2008 • proposers were given a chance to supplement • their target star lists and assign weights to objects • deadline Feb 2009 • finally we got 42 proposals with more than 6000 • candidate targets

  20. BRITE AO-I Proposals Overview • 42 proposals have been submitted • PIs from 13 countries • Austria (14), Australia (1), • Belgium (2), Bulgaria (1), • Canada (4), Croatia (1), • Germany (6), Iran (1), Poland (2), • Spain (1), Switzerland (1), U.K. (3) and USA (3) • O, B and Be stars, beta Cephei stars, hot Supergiants, • delta Scuti variables, gamma Doradus pulsators, • roAp / CP stars, red Giants , eclipsing binaries and more BRITE TARGET STAR CATALOG

  21. BRITE Targets Evaluation • weight individual stars in proposals • weight the scientific merit of each proposal • calculate the weighted density of stars accross the sky • select the fields with highest density which are seperate properly in RA • invesigate fields that are observable all year BRITE_sky : BRITE Targets Display and Field Investigation Tool

  22. BRITE Targets Evaluation • four commissioning fields were tentatively selected by BEST in June 2009 • criteria were: distribution in RA to cover all seasons real time access to ground stations potential scientifc content cf1 RA= 5.5h DEC= 0.0d (Orion) cf2 RA=10.8h DEC= +11.7d (Leo) cf3 RA=15.9h DEC= 0.0d (Ser) cf4 RA=22.0h DEC= +60.5d (Cep)

  23. BRITE Commissioning Fields • 40 proposals have been submitted • 13 PI‘s and their teams • Austria (13), Australia (1), • Belgium (2), Bulgaria (1), • Canada (4), Croatia (1), • Germany (6), Iran (1), Poland (2), • Spain (1), Switzerland (1), U.K. (3) and USA (3) • O, B and Be stars, beta Cephei stars, hot Supergiants, • delta Scuti variables, gamma Doradus pulsators, • roAp / CP stars, red Giants , eclipsing binaries and more BRITE CANDIDATE TARGET STAR CATALOG BRITE-sky: a target fields evaluations tool

  24. maximize output of mission required 15min observations of one field/orbit the orbit period will be ~101min observing one of more fields per orbit data volume needs to be in check BRITE Observing Strategy

  25. BRITE Observing Strategy Considerations for one pair of (Blue-Red) Satellites Launch Field 1 Field 1 Field 2 Field 2 Field 3 – all year access ~100min Year 1 Year 2 comm 2m

  26. BRITE Observing Strategy shared orbit observations Star Field 1 Star Field 2

  27. Star Field 1 Star Field 2 BRITE Observing Strategy 1 orbit (~101min)

  28. BRITE Project Status • Hardware development to be completed by Dec 2010 • Completion of the two satellites in March-2011 • Launch is schedule for June 2011 http://www.brite-constellation.at

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