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BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE - ConstellationBRITE - Constellation
BRIBRIghtght TTargetarget EExplorerxplorer
BRITE-AUT BRITE-CANBRITE-POL
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Mission Goals BRITE Mission Goals
high precision photometry (~mmag) high precision photometry (~mmag) selected very bright stars (<4 mag) selected very bright stars (<4 mag) 15 stars per field minimum (24deg FOV)15 stars per field minimum (24deg FOV) obtained during at least 15min per orbit (100min)obtained during at least 15min per orbit (100min) in (at least) two wavelength regions (blue-red)in (at least) two wavelength regions (blue-red) long time base observations (180 d/y/field)long time base observations (180 d/y/field) all sky access including polar regionsall sky access including polar regions 3 years lifetime per satellite (minimum 2)3 years lifetime per satellite (minimum 2) 1MByte/day science data (compressed)1MByte/day science data (compressed)
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE PhotometryBRITE Photometry
101 min
BLUE - RED
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Sky BRITE Sky
BRITE: BRITE: BRIBRIghtght TTargetarget EExplorerxplorer
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Target Stars Selection
42 proposals have been submitted 13 PI‘s and their teams Austria (15), 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
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE - ConstellationBRITE - Constellation
nano-satellites
20cm cube spacecrafts <8kg
3 axis pointing control
LEO sunsynchronous (polar) orbit
small aperture (3cm) telescopes
wide (24deg) field of view
one instrument is RED sensitive one BLUE
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Orbit and Observing Strategy
• Low Earth Orbit (LEO) Sun-Synch (Dawn-Dusk)
• 820 km, LTDN 6AM (BRITE_AUT)
• Orbit Period ~ 101min
• 15-40min/per orbit per field
• 1-3 fields per orbit
• 180-220 days per year
• 300 days per year (near pole)
Sun
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE-AUT Launch
Madras
SFL is contracted to launch BRITE-AUT Q1-2011
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Instrument - TelescopeBRITE Instrument - Telescope
5 lens system plus filter & baffle
for a 24 deg cicular FOV, telecentriclow distortion, mimimal vignetting
RED designBLUE design
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
good performance at high (+20C) temperatureslow power consumption and reasonable price
ReadNoise ~15e rms
KODAK KA11002
BRITE DetectorsBRITE Detectors
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE - FiltersBRITE - Filters
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE - FiltersBRITE - Filters
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE – Point Spread Function
0.50
+0.3
0.73
+0.2 +0.1
ZEMAX Model PSF - 5 deg offsets BRITE Blue
-0.1 -0.2 -0.3
1.07 0.83 0.61 0.52
intra focalextra focal
0.0
1.29
best focusdesign red: rms scatter in mmagblack: CCD distance in [mm]
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
ZEMAX Model PSF - 7 deg offsets BRITE Red
+0.3 +0.2 +0.1 0.0 -0.1 -0.15 -0.20
1.31 1.19 1.01 0.56 0.46 0.400.85
design red: rms scatter in mmagblack: CCD distance in [mm]
BRITE – Point Spread Function
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Point Spread FunctionBRITE Point Spread Function
BRITE Blue PSF 5 deg offsets
8 pixels diameter – 80 pixels carry signal ~30“/pixel
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE – Field Of ViewBRITE – Field Of View
2670 pixel
4000 pixel
30“/pixel
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010up to 15 (32x32pixel) ROI/Raster
Region of Interest ROI/Raster
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Onboard Data Processing
processed data:
sections:
RnnnB1-4 ... backgroundsRnnnA1-2 ... apertures
for each background median and sigma are
calculated+
the sum of signals valuesencompassed in the two
apertures
a total of 10 valuesH pix
V pix
RnnnB4
RnnnB2 RnnnB3
RnnnB1
BW pix
BW pix
ROI Rnnn
RnnA1
RnnnA2
X1Y1
Y2X2
BW ... width of background [pixels]
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Photometric PerformanceBRITE Photometric Performance
mag(V) = 0-> 1.3 sec / 14 exp per min
mag(V) = 2-> 8.0 sec / 5 exp per min
mag(V) = 4-> 50.0 sec / 1 exp per min
mag(V)
scat
ter
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Operational Software
Science Data Generation Code
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE Ground Station(s)
Primary Ground Station: IKS – TU Graz
Additional Locations:
UTIAS – Toronto Canada
TU Wien
IfA Uni Wien
BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010
BRITE-AUT Project Timeline
http://www.brite-constellation.at
development of thedevelopment of the hardware and softwarehardware and software
completion of twocompletion of two satellites June 2010satellites June 2010
launch targeted forlaunch targeted for January 2011January 2011