The Scientific Goals The Scientific Goals for Astronomical for Astronomical

SatelliteSatellite

National Astronomical Observatory,

CAS, China

History of the proposal

• 2000.6: Space-based Variable objects Monitor (SVOM) proposed by NAOC

Got support from CAS• 2002.7: Reviewed by committee, One of the most promising micro-satellite

proposal• 2003-2005: Funded by NSFC for pre-phase A• 2003: Connected with COROT and MONS• 2004: Proposed as a candidate proposal for

Sino-France cooperation

Similar astronomical satellites

• MOST ( Canada)

• COROT (France)

• SWIFT (USA)

MOST

Scientific Goals

• Stellar seismology ( as MOST,COROT)

• Searching for Exoplanet (as COROT)

• Monitoring GRB after-glows (as SWIFT)

• Studying XRF( high-z GRB?)

• X-ray/Optical simultaneously observations:

AGNe, X-binary, CVs, Solar-like activities,

……

Optical photometric telescope

Wide-field optical telescope

Wide-field X-ray telescopes

Optical patrol telescope

The optical axies of the four telescopes are

parallel in the normal case.

The Payload of SVOM

Optical Photometric telescope:

• Diameter: 30cm, f/7• E2V 47-20 1024*1024 frame-transfer CCD• FOV: ~22*22acrmin • 4000-8500 Å• Integrating time: 1 min

R=15.0m; ±0.01

• Using a quarter of FOV with an array of micro-lens as Fabry lens to avoid CCD saturation during observing bright stars and decrease the effect of un-uniformity of CCD’s response.

• Integrating time: 1min

m=10m, ±0.0005

5m, ±0.00005

For seismology and high accurate photometry

Optical Photometric telescope:

Frame-transfer CCD Marconi 47-20

Wild-field Photometric telescope:

• Diameter: 16cm, f/1.56• E2V 47-20• FOV: 3*3 degrees• 4000-8500 Å• Integrating time: 1 min

R=15.0m; ±0.02

For Exoplanet searching

17:25:28

f=250mm ,D=160mm Scale: 0.77 LVU 07-Apr-05

32.47 MM

17:26:53

0.000,0.000 DG 0.00, 0.00

0.000,0.500 DG 0.00, 0.24

0.000,0.700 DG 0.00, 0.33

0.000,1.400 DG 0.00, 0.67

0.000,2.100 DG 0.00, 1.00

FIELDPOSITION

DEFOCUSING 0.00000

f=250mm ,D=160mm

.874E-01 MM

Wide-field X-ray telescopes:

• Soft X-ray telescope:• Spectral resolution: 150-300 eV• Accuracy of position: 2-5 arcmin.• Range of energy: 0.5-20 keV• Field of View: 20 degrees

• Hard X-ray telescope:• Range of energy: 20-300 keV• Field of View: 20 degrees

Optical patrol telescope

40mm lens, f/1.0• E2V 47-20 1024 1024 frame-transfer CCD• FOV: ~20 20 degree2

• Integrating time: 1minm=15m, ±0.04

Star sensor and wide-field monitor

Operating modes

• Normal mode:

Seismology

X-ray/optical monitoring• X-ray trigger mode:

The optical photometric telescope points to the place of X-ray source. (2~3 times per year)

The wide-field optical telescope is always for exoplanets.

Thanks!Thanks!