LUT on Chang'e-3

Dec. 13, 2018

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LUT on Chang'e-3

  1. Lunar Astronomy with the LUT on Chang’e-3 lander National Astronomical Observatories, CAS/ Guangxi University J. Wang on behalf of LUT group Beijing 2018/12/07
  2. Contents  Lunar-based Ultraviolet Telescope  Performance on the Moon  Scientific results
  3. The dreams to observe the Universe on the Moon Far UV camera with Appolo 16
  4.  Lunar-based Ultraviolet Telescope (LUT, Cao+11)  A small, but automatic, telescope aboard CE-3 working in NUV. The FIRST automatic telescope landed on the extraterrestrial body in mankind history.  Scientific Objectives – Monitoring variable stars  Pulsating or binary stars, e.g., RR Lyr variables  Variable stars in clusters  Activities of solar-like stars – Survey the sky  Especially survey the low galactic latitude region;  Violent flare stars Lunar-based Ultraviolet Telescope I
  5.  Milestones – July 2004: Proposal Conception – Feb. 2009: Project Approval – Sep. 2009: Engineering Model – Dec. 2011: Flight Model – Dec. 02. 2013: Launch – Dec. 16. 2013: First Light – Jan. 2014 -- : Observations – The FIRST automatic telescope on the Moon for mankind. LUT First image RA. 16:45:00 Dec 50:26:00 (Draco) Lunar-based Ultraviolet Telescope II
  6. Lunar Enterprise Daily,2015/01/01
  7. A supporting system for LUT scientific obs Exp vs S/N Ins. setup Finding chart & catalog Obs sequence head Obs sequence: Time slot Position of Gimbal Rotation step Target & comp coordinate
  8.  Instrument Specifications  Comp: Telescope+Pointing Reflector Item Value Diameter 150mm Focal Length 562.5mm Wavelength 245—340 nm Field of view 1.36  1.36 Square Degrees CCD camera E2V 47-20 UV enhanced Working time lunar day time Life time > one year Weight 13.6 kg Lunar-based Ultraviolet Telescope III
  9. Performance on the Moon I Sky Coverage: inside the red circle Pointing calibration Allow the telescope to point to any target & trace smoothly  Flux calibration – ~13.5 mag in lunar day time – ~15.5 mag with dark sky 4 images combined (dark sky)
  10. Data Processing  Almost following the standard processing of astronomical CCD photometry;  Bias & dark corrections;  Scattering light subtraction;  Aperture photometry;  Astrometry calibrations  Flux calibrations with standard photometry stars;  Pipelines have been developed with using the popular astronomy software package, IRAF & Python. Performance on the Moon V
  11. Scattering light subtraction  Dedicated pipelines were developed to subtract the scattering light. The scattering light imageCCD image Subtracted image
  12. Scientific results I  Sky Survey in NUV – Bright sources catalog (Meng+2016) – 86 467 stars down to 16mag
  13. Scientific results II  Monitor of various variable stars hard to be done on ground Identification of rapidly mass-transferring binary stars in a 6- stars system! AI Dra: Algol-type eclipsing binary with P=1.1988 days.
  14. Scientific results III  The lowest upper limit on OH concentration in lunar exosphere Method Surface concentration(cm-3) HST spectroscopy <106(5σ) Apollo12/14/15 CCGEs <107 Chandrayaan/CHACE <2 ×109 LUT background emission <4 ×104 Chandrayann-I M3 3μm OH absorption distrib
  15. The End Thanks