Resource Type: / Content Level: Amateur / Capability Type: Simple Cone Search

ID:: ivo://org.gavo.dc/apass/q/cone
Title:: AAVSO Photometric All Sky Survey (APASS) DR10
Short Name:: APASS DR10 cone
Date:: 27 Dec 2024 08:31:05
Publisher:: The GAVO DC team
Description:: AAVSO Photometric All-Sky Survey (APASS), underway since 2010, covers the entire sky from 7.5 < V < 16.5 magnitude, and in the BVugrizY bandpasses. A northern and a southern site are used, each with twin ASA 20cm astrographs and Apogee Aspen CG16m cameras, covering 2.9x2.9 square degrees with 2.6arcsec pixels. Landolt and SDSS standards are used for all-sky solutions, with typical 0.02mag calibration errors on the bright end. Data Release 10 is a complete reprocessing of all 500K images taken with the system, including hundreds of nights not part of DR9. Sextractor is used for star finding and centroiding; DAOPHOT is used for aperture photometry; the astrometry.net plate-solving library is used for basic astrometry, supplanted with more precise WCS that utilizes knowledge of the optical train distortions. With these changes, DR10 includes many more stars than prior releases. More information is available at http://www.aavso.org/apass.

ID:: ivo://org.gavo.dc/cstl/q/cone
Title:: Constellations as Polygons
Short Name:: cstl cone
Date:: 27 Dec 2024 08:31:13
Publisher:: The GAVO DC team
Description:: This cone search will return all constellations within the cone, together with the J2000 polygons of them.

ID:: ivo://fs.usno/cat/usnoa2
Title:: USNO-A2 Catalogue
Short Name:: USNO-A2
Date:: 03 Feb 2020 22:20:44
Publisher:: United States Naval Observatory, Flagstaff Station
Description:: USNO-A2.0 is a catalog of 526,280,881 stars, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans that were the basis for the USNO-A1.0 catalog. The major difference between A2.0 and A1.0 is that A1.0 used the Guide Star Catalog (Lasker et al. 1986, see Cat. <I/220>) as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997, see Cat. II/246>). A2.0 presents right ascension and declination (J2000, epoch of the mean of the blue and red plate) and the blue and red magnitude for each star. Usage of the ACT catalog as well as usage of new astrometric and photometric reduction algorithms should provide improved astrometry (mostly in the reduction of systematic errors) and improved photometry (because the brightest stars on each plate had B and V magnitudes measured by the Tycho experiment on the Hipparcos satellite). The basic format of the catalog and its compilation is the same as for A1.0, and most users should be able to migrate to this newer version with minimal effort. (1 data file).

ID:: ivo://fs.usno/cat/usnob
Title:: USNO-B1 Catalogue
Short Name:: USNO-B1
Date:: 03 Feb 2020 22:21:11
Publisher:: United States Naval Observatory, Flagstaff Station
Description:: USNO-B is an all-sky catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,042,618,261 objects derived from 3,643,201,733 separate observations. The data were obtained from scans of 7435 Schmidt plates taken for the various sky surveys during the last 50 years. USNO-B1.0 is believed to provide all-sky coverage, completeness down to V=21, 0.2" astrometric accuracy at J2000, 0.3 mag photometric accuracy in up to five colors, and 85% accuracy for distinguishing stars from nonstellar objects. A brief discussion of various issues is given here, but the actual data are available from the US Naval Observatory Web site and others.

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