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511 resources. Showing 1 to 19. >>Next
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Copernicus Satellite(Copernicus )
The Copernicus satellite, otherwise known as the Orbiting Astronomical Observatory 3 (OAO-3), obtained a series of high resolution far- (900-1560 Å) and near- (1650-3150 Å) ultraviolet spectral scans of 551 objects, primarily bright stars, from 1972 to 1981.		 Stars, Hot stars, Cool stars, Variable stars CONE
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Extreme Ultraviolet Explorer(EUVE )
Launched in June, 1992, The Extreme Ultraviolet Explorer (EUVE) conducted the first extreme ultraviolet (70-760 Angstroms) survey of the sky and subsequently began a Guest Observer Program of pointed 		Surveys, Hot stars, White dwarfs, Variable stars, Comets, Galaxies CONE
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Far Ultraviolet Spectroscopic Explorer(FUSE )
The Far Ultraviolet Spectroscopic Explorer (FUSE), launched on June 24, 1999, covers the 905-1187 Å spectral region and will obtain high resolution spectra of hot and cool stars, AGNs, supernova remnants, planetary nebulae, solar system objects as well as perform detailed studies of the interstellar medium. FUSE will be able to observe sources 10 000 times fainter than Copernicus, an early FUV mission, and has superior resolving power than the Hopkins Ultraviolet Telescope (HUT) and the Berkeley Spectrograph (BEFS) and the Tübingen Echelle Spectrograph (TUES) of the Orbiting Retrievable Far and Extreme Ultraviolet Spectrometers (ORFEUS). FUSE was planned for a 3 year lifetime with funding for an additional 2 years expected.		 Hot stars, White dwarfs, Variable stars, Galaxies, Interstellar medium CONE
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Guide Star Catalog 1(GSC1 )
The Guide Star Catalog I (GSC I) is an all-sky optical catalog of positions and magnitudes of approximately 19 million stars and other objects in the 6th to 15th magnitude range. GSC I catalog is used for the control and target acquistion of the Hubble Space Telesope.		 Surveys, Stars CONE
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Guide Star Catalog 2.2(GSC2.2 )
GSC2.2.0 is an all-sky export of calibrated photographic survey plate source parameters from the COMPASS database. All sources exported are from the second-generation plate-processing pipeline with t		 Surveys CONE
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Hipparcos Space Astrometry Mission(HIP )
Hipparcos is a pioneering space experiment dedicated to the precise measurement of the positions, parallaxes and proper motions of the stars. The intended goal was to measure the five astrometric parameters of some 120 000 primary programme stars to a precision of some 2 to 4 milliarcsec, over a planned mission lifetime of 2.5 years, and the astrometric and two-colour photometric properties of some 400 000 additional stars (the Tycho experiment) to a somewhat lower astrometric precision. The project was accepted within the ESA scientific programme in 1980. The satellite was launched by Ariane, in August 1989, and after collecting more than three years of extremely high-quality scientific data, communications were terminated with the satellite in August 1993. All of the mission goals have been significantly exceeded. The final Hipparcos Catalogue (120 000 stars with 1 milliarcsec level astrometry) and the final Tycho Catalogue (more than one million stars with 20-30 milliarcsec astrom		 Stars CONE
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Hopkins Ultraviolet Telescope(HUT )
The Hopkins Ultraviolet Telescope (HUT) was a shuttle-borne instrument used to obtain ultraviolet spectra in the far ultraviolet region of the spectrum. It was part of the ASTRO payload complement of three co-mounted instruments that flew in December 1990 and March 1995 as Space Shuttle missions.		 Quasars, Galaxies, AGN, Variable stars, Nebulae, Solar system CONE
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International Ultraviolet Explorer(IUE )
The International Ultraviolet Explorer (IUE) performed spectrophotometry at high (0.1-0.3 Å) and low (6-7 Å) resolution between 1150 Å and 3200 Å. The data cover a dynamic range of approximately 17 astronomical magnitudes: -2 to 10 for high dispersion; -2 and 14.9 for low dispersion. Over 104,000 ultraviolet spectra were obtained with IUE between January 26, 1978, and September 30, 1996.		 Stars, Galaxies, Nebulae CONE
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Tubingen Echelle Spectrograph(TUES )
The Tübingen Echelle (TUES) obtained moderate dispersion observations (R=13,000) using an echelle grating including orders 40 - 61 from 910 - 1410 Angstroms. The instrument was designed and built by the University of Tübingen (PI: M. Grewing) and flew as one of three spectrographs on the ORFEUS/SPAS-2 mission for 14 days in November/December 1996. The instrumental resolution was about 10,000 and the effective aperture peaks at 1.3 cm2 near 1100 Angstroms. Objects were observed in a 10 arcsec entrance aperture. The wavelength calibration was established by means of interstellar molecular hydrogen lines.		 Stars, Planetary nebulae CONE
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Ultraviolet Imaging Telescope(UIT )
The Ultraviolet Imaging Telescope UIT was one of three ultraviolet telescopes on the ASTRO-1 mission flown on the space shuttle Columbia during 2-10 December 1990. The same three instruments were later flown on the space shuttle Endeavour from 3-17 March 1995, as part of the ASTRO-2 mission. Exposures were obtained on 70-mm photographic film in the 1200-3300 Å range using broadband filters and later digitized using a Perkin-Elmer microdensitometer. Image resolution was 3" over a 40' field of view. Overall, UIT-1 obtained 821 exposures of 66 targets, and UIT-2 obtained 758 images of 193 targets.		 Stars, Galaxies, Nebulae CONE
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Wisconsin Ultraviolet Photo-Polarimeter Experiment(WUPPE )
The Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) was the spectropolarimetry component of the three ASTRO instruments that flew on Space Shuttle missions in December 1990 and March 1995. A halfwave spectropolarimeter provided medium resolution spectropolarimetry for research into the interstellar medium, hot stars, stars with circumstellar material, interacting binary stars, novae, solar system objects, and active galaxies. A Lyot analyzer obtained low resolution observations of faint targets, but due to calibration problems did not produce scientifically useful data. The WUPPE instrument provides a unique data set, one of the few providing polarimetric data in the ultraviolet portion of the spectrum.		 Interstellar medium, Hot stars, Binary stars, AGN CONE
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2MASS All-Sky Point Source Catalog(2MASS-PSC(CDS) )
2MASS has uniformly scanned the entire sky in three near-infrared bands to detect and characterize point sources brighter than about 1 mJy in each band, with signal-to-noise ratio (SNR) greater than 1		 Infrared Astronomy, Surveys CONE
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Smithsonian Astrophysical Observatory Star Catalog(SAO )
This machine-readable SAO catalog from the Astronomical Data Center is based on an original binary version of the Smithsonian Astrophysical Observatory Star Catalog (SAO, SAO Staff 1966). Subsequent improvements by T. A. Nagy (1979) included the addition of equatorial coordinates in radians and cross-identifications from the Table of Correspondences SAO/HD/DM/GC (Morin 1973). As a prelude to creation of the 1984 version of the SAO, a new version of the SAO-HD-GC-DM Cross Index was prepared (Roman, Warren, and Schofield 1983). The 1984 version of the SAO contained the corrected and extended cross identifications, all errata published up to January 1984 and known to the ADC, numerous errors forwarded to the ADC by colleagues, and errors discovered at the ADC during the course of this work. Clayton A. Smith of the U. S. Naval Observatory provided J2000.0 positions and proper motions for the SAO stars. Published and unpublished errors discovered in the previous version (1984) have been cor		 Stars CONE
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Washington Visual Double Star Catalog(WDS )
The Washington Visual Double Star Catalog, 1996.0 (WDS) is the successor to the catalog of the same name dated 1984 I/107. The WDS is intended to contain all known visual double stars for which at least one differential measure has been published through the end of 1995. It includes a discoverer code, the date of the first and last observations, the number of observations, the position angle and separation for the first and last observation, the magnitudes and spectral types of the components (when available) the proper motion of the system, Durchmusterung numbers of the components and notes for further information.		 Stars CONE
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USNO-A2.0(USNO-A2.0 CDS )
USNO-A2.0 contains entries for over a half billion stars (526,230,881, to be exact!) which were detected in the digitized images of three photographic sky surveys. For the entire northern sky and the southern sky down to declinations of -30°, all the photographic plates were part of the original Palomar Optical Sky Survey (POSS-I). Photographs were taken on blue- and red-sensitive emulsions. Only those stars which were detected in both colors were included in the USNO-A2.0 catalog. The rest of the southern sky was covered by the Science Research Council (SRC)-J survey and the European Southern Observatory (ESO)-R survey. Again, only stars appearing in both colors were accepted for the final catalogue.		 Surveys CONE
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Tycho-2 Catalog(TYCHO-2 )
The Tycho-2 Catalogue is an astrometric reference catalogue containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1; see Cat. I/239)) collected by the star mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143 other ground-based astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, as well as the ACT (Cat. I/246) and TRC (Cat. I/250) catalogues based on Tycho-1. Supplement-1 lists stars from the Hipparcos and Tycho-1 C		 Astrometry, Stars CONE
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First U.S. Naval Observatory CCD Astrograph Catalo(UCAC1 )
The UCAC1 is a high density, highly accurate, astrometric catalog of over 27 million stars in the Southern Hemisphere in the magnitude range of about 8 to 16. This version is the first release of an ongoing project to observe the entire sky; for up-to-date information see the Web page at http://ad.usno.navy.mil/ad/ucac/ . The UCAC1 is a preliminary catalog. By avoiding all "problem cases" (see details in the "intro.txt" file) it is not complete. Positions, proper motions and errors are provided, together with approximate magnitudes in the 579-642nm range. The positional precision is about 20 mas for 9 to 14 mag and 70 mas at 16th mag. The errors of the proper motions are very heterogeneous, ranging from 1 to 35 mas/yr. The UCAC is an observational program using the U.S. Naval Observatory Twin Astrograph and a 4kx4k CCD camera, covering just over 1 square degree per frame with a scale of 0.9"/pixel. Observations started in January 1998 at Cerro Tololo Interamerican Observatory (CTIO) 		Surveys, Astrometry, Proper motions CONE
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AC 2000.2 Catalogue (AC2000.2 )
The AC 2000.2 is a revised version of the 1997 release of the AC 2000 (Urban et al. 1998). It was decided that the availability of an improved reference catalogue and the inclusion of the Tycho-2 photometry would be sufficient to warrant a complete re-reduction of the data and a new distribution of the catalogue. The AC 2000.2 is a catalogue of positions and magnitudes of 4,621,751 stars covering the entire sky around the epoch of 1900. The data are derived from the images measured and published as part of the Astrographic Catalogue (AC). The positions are on the Hipparcos reference frame (ESA 1997), having originally been reduced plate-by-plate using an updated version of the Astrographic Catalog Reference Stars. Each of the 22 zones of the AC has been reduced independently, since telescopes, observing techniques and measurement methods varied. This document describes the history behind the Astrographic Catalogue, the reference catalogue used to transform the measurements to equatoria		 Stars CONE
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All-Sky Compiled Catalogue of 2.5 Million Stars(ASCC-2.5 )
The All-Sky Compiled Catalogue of 2501304 stars (ASCC-2.5) with the limiting magnitude V=12-14 is a result of a merging of star lists from present day large high-precision catalogues from space (Hipparcos-Tycho family catalogues: Hipparcos main catalogue including Multiple System Annex I/239, Tycho-1 I/239, Tycho-2 I/259, ACT-RC I/246, TRC I/250) and ground-based (PPM-N I/146, PPM-S I/193, PPM-add I/208, CMC11 I/256) observations and reduction to standard systems of corresponding stellar data. Main stellar data presented in the ASCC-2.5 are the equatorial coordinates (J2000, epoch 1991.25), proper motions in the Hipparcos system, B and/or V stellar magnitudes in the Johnson system. Additionally for some stars are given trigonometric parallaxes, spectral classes in the MK or HD system, multiplicity and variability flags, Hipparcos, Tycho-2, HD, DM designations.		 Stars CONE
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