Diva - A Small Satellite for Global Astrometry and Photometry
نویسندگان
چکیده
منابع مشابه
PSFs, Photometry, and Astrometry for the ACS/WFC
We develop and present effective PSFs for the F606W filter in the WFC, and then for five other filters. After briefly reviewing the concept of the effective PSF, we show that the WFC PSF varies with position in the detector. We represent the PSF by a 9×10 array of fiducial PSFs, between which a tailor-made PSF is to be interpolated for each star. Fitting these PSFs to star images gives photomet...
متن کاملStellar Photometry and Astrometry with Discrete Point Spread Functions
The key features of the MATPHOT algorithm for precise and accurate stellar photometry and astrometry using discrete Point Spread Functions are described. A discrete Point Spread Function (PSF) is a sampled version of a continuous PSF which describes the two-dimensional probability distribution of photons from a point source (star) just above the detector. The shape information about the photon ...
متن کاملGlobal astrometry with OSI
— The Orbiting Stellar Interferometer is a proposed space-based interferometer which makes very accurate wide-angle astrometric measurements on several thousand stars. As opposed to Hipparcos, OSI does not have a “basic angle” between two separate field-of-views but three separate interferometers and a highly accurate metrology system. The questions addressed in this paper are whether it is pos...
متن کامل00 2 Improved Astrometry and Photometry for the Luyten Catalog . I . Bright Stars
We outline the construction of an updated version of the New Luyten TwoTenths (NLTT) catalog of high proper motion stars, which will contain improved astrometry and photometry for the vast majority of the ∼ 59, 000 stars in NLTT. The bright end is constructed by matching NLTT stars to Hipparcos, Tycho2, and Starnet; the faint end by matching to USNO-A and 2MASS. In this first paper, we detail t...
متن کاملglobal results on some nonlinear partial differential equations for direct and inverse problems
در این رساله به بررسی رفتار جواب های رده ای از معادلات دیفرانسیل با مشتقات جزیی در دامنه های کراندار می پردازیم . این معادلات به فرم نیم-خطی و غیر خطی برای مسایل مستقیم و معکوس مورد مطالعه قرار می گیرند . به ویژه، تاثیر شرایط مختلف فیزیکی را در مساله، نظیر وجود موانع و منابع، پراکندگی و چسبندگی در معادلات موج و گرما بررسی می کنیم و به دنبال شرایطی می گردیم که متضمن وجود سراسری یا عدم وجود سراسر...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1998
ISSN: 1539-2996
DOI: 10.1017/s1539299600022413