brite-constellation meeting warzaw feb 2010 brite - constellation bright target explorer...

BRITE-Constellation Meeting Warzaw Feb 2010BRITE-Constellation Meeting Warzaw Feb 2010

BRITE - ConstellationBRITE - Constellation

BRIBRIghtght TTargetarget EExplorerxplorer

BRITE-AUT BRITE-CANBRITE-POL


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 PhotometryBRITE Photometry

101 min

BLUE - RED


BRITE Sky BRITE Sky

BRITE: BRITE: BRIBRIghtght TTargetarget EExplorerxplorer


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 - 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 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-AUT Launch

Madras

SFL is contracted to launch BRITE-AUT Q1-2011


BRITE Instrument - TelescopeBRITE Instrument - Telescope

5 lens system plus filter & baffle

for a 24 deg cicular FOV, telecentriclow distortion, mimimal vignetting

RED designBLUE design


good performance at high (+20C) temperatureslow power consumption and reasonable price

ReadNoise ~15e rms

KODAK KA11002

BRITE DetectorsBRITE Detectors


BRITE - FiltersBRITE - Filters


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]


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 Point Spread FunctionBRITE Point Spread Function

BRITE Blue PSF 5 deg offsets

8 pixels diameter – 80 pixels carry signal ~30“/pixel


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 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 Photometric PerformanceBRITE Photometric Performance

mag(V) = 0-> 1.3 sec / 14 exp per min



mag(V)

scat

ter


BRITE Operational Software

Science Data Generation Code


BRITE Ground Station(s)

Primary Ground Station: IKS – TU Graz

Additional Locations:

UTIAS – Toronto Canada

TU Wien

IfA Uni Wien


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


http://www.brite-constellation.at

brite-constellation meeting warzaw feb 2010 brite - constellation bright target explorer...

Documents

britepol slide

magv scatter slide

software hardware

mmag high precision

software completion