LAMOST

n  Pilot survey: 2011.10 - 2012.5 n  Phase-I Regular survey: 2012.10 – 2017.6 n  Phase-II Pilot survey: 2017.9-2018.6 n  Phase-II Regular survey: 2018.9-present (low- + intermediate-resolution) n  Phase II development (a new fiber system + a new site)? In pilot survey and phase-I regular survey, LAMOST has collected nearly 9 million spectra, including over two hundred thousand spectra of extra-galactic objects (galaxy and qso) and nearly 7.5 million qualitied (SNR > 10) spectra of star.

Comments

Comments — continued

Multi-channel Photometric Survey Telescope — MEPHISTO

Massively multiplexed spectroscopy with MSE: Science,

Project and Vision, 2019/02/26, Tucson, USA

MEPHISTO in one sentence: MEPHISTO, a 1.6m multi-channel survey telescope, first of its type in the world, will deliver real-time, high-quality colours of unprecedented accuracy for celestial objects, enable fast and robust classification of transients and variables, and deliver, for the first time, a panchromatic documentary of our evolving universe. �

The power of colours: à Physical quantities (Teff, log g, [Fe/H] …… ) à Fast & transient robust identification & classification

for follow-up observation

MEPHISTO  features:  •  Real-­‐5me  colours  (and  varia5ons)  for  iden5fica5on  &  classifica5on;    

•  Superb  colour  accuracies,  0.2-­‐0.5%;  

•  Fast  survey  speed,  1800  deg2  in  3  bands  per  night;  

•  A  (SkyMapper)  filter  set  op5mized  for  stellar  astrophysics  

•  A  high  al5tude  site  for  high  UV    transmission  

•  CCD  sensors  op5mized  for  the  whole  op5cal  wavelength  range  

Massively multiplexed spectroscopy with MSE: Science,

Project and Vision, 2019/02/26, Tucson, USA

Blue camera u/v�

Yellow camera g/r�

Red

cam

era

i/z�

Cubic prisms �

Astigmatism for convergent light �

MEPHISTO LSST 1.4 Gigapix 3.2 Gigapix

3 × 3.14 deg2 9.6 deg2

0.286′′/pixel 0.2′′/pixel