Optical scheme for the 'Struve' space astrometric project
| Autor: | G. I. Tsukanova, V. N. Yershov, G. F. Zakharenkov, V. D. Starichenkova |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Epoch (reference date) media_common.quotation_subject Astrophysics::Instrumentation and Methods for Astrophysics Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics law.invention Telescope Stars Interferometry Photometry (astronomy) Observatory Sky law Astrophysics::Solar and Stellar Astrophysics Satellite Astrophysics::Earth and Planetary Astrophysics Instrumentation Astrophysics::Galaxy Astrophysics media_common Remote sensing |
| Zdroj: | Astronomical & Astrophysical Transactions. 13:29-34 |
| ISSN: | 1476-3540 1055-6796 |
| DOI: | 10.1080/10556799708208112 |
| Popis: | A few options of the optical scheme for the future Russian astrometric satellite (“Struve”) are discussed. Interferometric and single-aperture options of the on bod telescopes are compared from the points of view of optical resolution, quality of image, achievable positional accuracy, and feasibility of the scheme. Two telescopes are planned to be used on board the Struve satellite in order to scan the sky with two basic angles. With these two telescopes one can make observations using two different photodetedors: for example, the visual (A,,, = 0.7~) and the ultraviolet one (A,,, = 0.15 g). In addition, middleband photometry will be made at the visual channel which gives data on spectral features, chemical composition, and the evolution of stars. A tree-mirror reflector optical scheme is concluded to be optimal in the astrometric Satellite. The Struve astrometric satellite which is being developed at the Pulkovo Observatory in cooperation with the Krasnoyarsk Institute of Applied Mechanics, S. I. Vavilov’s State Optical Institute and some other space instrumentation institutes, will produce observations of a second epoch for the Hipparcos stars. The project is devoted to maintaining the Hipparcos coordinate system as well as extending it to a density of x 100 stars per square degree. Being launched a decade after Hipparcos, the new satellite will improve proper motions and will essentially decrease the degradation of the Hipparcos reference system. The satellite is being designed to rotate very smoothly in order to minimize errors of observations. Wide arcs of the sky will be measured by combining separated fields of the sky in one telescope. The basic measuring angle will be formed by a special beam combiner placed in front of the telescope. Two different basic angles and two |
| Databáze: | OpenAIRE |
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