Naoteru Gouda(NAOJ) Taihei Yano (NAOJ) Nano-JASMINE project team
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1 A very small satellite for space astrometry: Nano-JASMINE Yoichi Hatsutori(NAOJ) Naoteru Gouda(NAOJ) Yukiyasu Kobayashi(NAOJ) Taihei Yano (NAOJ) Yoshiyuki Yamada (Kyoto Univ.) Nano-JASMINE project team
2 Nano-JASMINE Mission: Astrometry Size: Nano-size satellite (50 x 50 x 50 cm) Mass: 25 kg accuracy: 3 mas Launch: 2010 Orbit: sun-synchronized synchronized orbit ( km) Mission life time: 1.5 years Survey Area: whole sky Spin Satellite (Spin rate is synchronized to orbital period)
3 Motivation First space astrometry mission in Japan Challenge to observe astrometric t parameter comparable to HIPPARCOS (50 times lighter than HIPPARCS) 15 years passed since the end of the HIPPARCOS mission improve proper motions of stars Technical demonstration for JASMINE (First satellite of JASMINE series)
4 Features of Nano-JASMINE 5 cm reflecting telescope (focal length: 167 cm) HIPPARCOS type satellite (using beam-combiner) Drift scan (Time-Delayed Integration, TDI) Star Image Extractor (On-board data processing tool) Algorithm for centroid estimation (1/100 pixel)
5 Optical layout and Specification Specification i Aperture (M1) : φ5cm Focal length : 167cm Type : Ritchey-Chretien type 2 aspherical mirrors & 3 folding mirrors FOV : 0.5 x 0.5 deg Wavelength : λ~0.9μm (z-band) Optical Layout (Beam-combiner appear around M2) CCD : 2k x 1k (Full-depletion) Relative angle of Beam combiner : 99.5deg Operating temperature : 170K ~ 220K
6 Optical System (assembled telescope)
7 Optical Path: FOV1 Beam Combiner Secondary Mirror 4th Mirror Pi Primary Mirror 3rd Mirror 5th Mirror CCD FOV2
8 Fabrication of telescope All mirrors and their structural supports are shaped out of aluminum alloys All reflecting surfaces were fabricated with diamond turning machine Beam-combiner M1 M2 Beam-combiner M1 12cm M5 M4 M3 17 cm 12 cm Optical component (deposited by Cr and Au) Assembled telescope Totally weigh: 1.7kg
9 Performance Test Wavefront error is measured through the whole optics of the telescope Wavefront error of each mirror Total wavefront error Assembled telescope achieves diffraction-limited performance
10 Full Depletion CCD Large quantum efficiency in near infrared range Developed by NAOJ and Hamamatsu Photonics
11 Drift Scan (Time-Delayed Integration) Observed stars move with satellite spin Charge transfer Charge transfer is synchronized with satellite motion Each star is exposed about 8 sec. Endless stripes of an image is produced. (Observation Duty: 95%)
12 Star Image Extractor Data rate of raw data: 2Mbps Down link rate: 100kbps (visibility: 5%) Raw Data Extracted Data 5 9pixel image around each stars is extracted
13 Attitude Control LSF for xy axis Extracted images are feed-backed to the controller Extracted Image LSF for z axis Instruments for Attitude control Sensor Star Tracker (STT) Fiber Optical Gyro (FOG) Mission Telescope Actuator Reaction Wheel (RW) Magnetic Torquer (MTQ) Angu ular Veloc city [rad/ /s] Requirement Time [s] Result of numerical analysis
14 Thermal Analysis variation of relative angle affects position determination accuracy relative angle of beam-combiner should be kept within 1 milli-arc-sec Requirement Operating temperature : 170K~220K (Dark noise of CCD) Stability of beam combiner : 1mas Thermal Shield for telescope Thermal Analysis is needed
15 Thermal Control Results of thermal analysis Radiation shield and cooling (passive control) - Optical system is cool-downed under220k - Relative angle of beam combiner is kept within 1mas
16 Engineering Model
17 Environmental tests Vibration test Thermal vacuum test Radiation test
18 Ground Station Uplink and Downlink station ti 3m radio antenna (University of Tokyo, Japan) Downlink station 10m radio antenna (Mizusawa branch of NAOJ) Kiruna Tracking Station (Sweden) - TBD Kiruna Mizusawa Univ. of Tokyo 10m radio antenna 10m radio
19 Launch NAOJ, University of Tokyo, Alcantara Cyclone Space and SDO Yuzhnoye have signed the memorandum of understanding (MOU) to launch Nano-JASMINE by Cyclone-4 rocket from Brazil in Alcantara Launch Center Rio de Janeiro Cyclone-4 rocket SDO Yuzhnoye
20 Summary Nano-JASMINE is a first astrometry satellite in Japan First satellite of JASMINE series Engineering i model passed some environmental tests t Nano-JASMINE will be launched from Brazil in 2010
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