Zobrazeno 1 - 5
of 5
pro vyhledávání: '"S. G. Els"'
Autor:
Anthony G. A. Brown, H. I. Siddiqui, G. Garcia, S. G. Els, M. Garcia-Reinaldos, N. Cheek, Giovanni Comoretto, Antonella Vallenari
Publikováno v:
SPIE Proceedings.
With its launch at the very end of 2013, ESA's astrometry satellite Gaia began its endeavor to compile astrometric and photometric measurements of at least one billion objects, as well as high resolution optical spectra of hundred million objects. Th
Publikováno v:
SPIE Proceedings.
The Gaia survey mission, operated by the European Space Agency (ESA) and launched on 19 December 2013, will survey approximately 109 stars or 1% of the galactic stellar population over a 5.5 year period. The main purpose of this mission is micro-arcs
Autor:
G. Gracia, D. Ordoñez, Antonella Vallenari, Giovanni Comoretto, M. Beck, William O'Mullane, N. Cheek, T. Lock, S. G. Els
Publikováno v:
SPIE Proceedings.
Gaia* is Europe's astrometry satellite which is currently entering its operational phase. The Gaia mission will determine the astrometric, photometric properties, as well as the radial velocities of over one billion stellar objects. The observations
Autor:
N. Cheek, G. Gracia, Giovanni Comoretto, T. Lock, William O'Mullane, S. G. Els, Antonella Vallenari
Publikováno v:
SPIE Proceedings.
With the successful launch of the next generation space astrometry mission Gaia* in December 2013, this paper is going to provide an overview and status of this mission after its first half year of operations in space. We will provide a summary of th
Autor:
K. Vogiatzis, S. G. Els
Publikováno v:
SPIE Proceedings.
We present a study of the impact of short term variations (up to hours) of the physical conditions at a site on the atmospheric seeing conditions. This study includes ground layer seeing estimates through the use of computational fluid dynamics (CFD)