Software for Space Telescope Astrometry
نویسندگان
چکیده
منابع مشابه
Astrometry with the Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR
We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis using DeHt 5 as an example. We obtain these planetary nebula nuclei (PNNi) parallaxes with astrometric data from Fine Guidance Sensors FGS 1R and FGS 3, white-light interferomet...
متن کاملSmall Field Ccd Astrometry with a Long Focus Reflector Telescope
We discuss the use of the block adjustment method for determining astrometric positions from a mosaic of CCD frames taken with a long focus reflector telescope. The observations cover an area of 25 × 25 around the open cluster Rup21. The source of reference positions was the Tycho-2 Catalogue. The internal error in the measured positions is analyzed, and the external error is estimated from com...
متن کاملThe Future of Space Astrometry
The future of space-based astrometric missions appears to be very promising. Three missions were described at IAU Colloquium 180. These are the Full-sky Astrometric Mapping Explorer (FAME), the Space Interferometry Mission (SIM) and the Global Astrometric Interferometer for Astrophysics (GAIA) missions. These missions will substantially improve the accuracy of global astrometric measurements ma...
متن کاملSpace - VLBI phase - reference mapping and astrometry
We present 5 GHz space-VLBI observations of the quasar pair B 1342+662 / B 1342+663 that demonstrate the feasibility of phase-reference techniques using an antenna in space. The space-based data were taken by the satellite HALCA, of the space-VLBI mission VSOP. From residual (referenced) phases we derive an upper bound of 10 meters to the uncertainty of the spacecraft orbit reconstruction. An a...
متن کاملSpace telescope Imaging Spectrograph
We acquired spectra of 24 LMC PNe in the 1150–3000 Å range in order to determine carbon and other ionic abundances. The sample more than doubles the number of LMC PNe with good quality UV spectra in this wavelength range, and whose optical images are available in the HST archive. The Space Telescope Imaging Spectrograph was used with a very large aperture to obtain virtually slit-less spectra, ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1986
ISSN: 0074-1809
DOI: 10.1017/s0074180900077135