UCAC4: Resource Record Summary

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Resource Record Summary

Catalog Service:
The Fourth U.S. Naval Observatory CCD Astrograph Catalog

Short name: UCAC4 IVOA Identifier: ivo://irsa.ipac/USNO/Catalog/UCAC4Publisher: NASA/IPAC Infrared Science Archiveivo://irsa.ipac/IRSA[Pub. ID] More Info: https://irsa.ipac.caltech.edu/data/UCAC4/readme_u4.txt VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2015 Jan 14 02:45:00Z
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Description

UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag range. Proper motions have been derived for most of the about 113 million stars utilizing about 140 other star catalogs with significant epoch difference to the UCAC CCD observations. These data are supplemented by 2MASS photometric data for about 110 million stars and 5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric All-Sky Survey) for over 50 million stars. UCAC4 also contains error estimates and various flags. All bright stars not observed with the astrograph have been added to UCAC4 from a set of Hipparcos and Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars to about R=16, with the source of data indicated in flags.

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

Publisher: NASA/IPAC Infrared Science Archiveivo://irsa.ipac/IRSA[Pub. ID]

Creator: Zacharias et al.

Contact Information:

X IRSA Support Team
Email: irsasupport at ipac.caltech.edu
Address:

Status of This Resource

This section provides some status information: the resource version, availability, and relevant dates.

Version: n/a
Availability: This is an active resource.

This service apparently provides only public data

Relevant dates for this Resource:

Creation: 2012 Nov 20

This resource was registered on: 2015 Jan 14 02:45:00Z
This resource description was last updated on: 2018 Oct 01 20:27:21Z

What This Resource is About

This section describes what the resource is, what it contains, and how it might be relevant.

Resource Class: CatalogService: This resource is a service that provides access to catalog data. You can extract data from the catalog by issuing a query, and the matching data is returned as a table.

Resource type keywords: Catalog	Subject keywords: all sky survey
Intended audience or use: Research: This resource provides information appropriate for supporting scientific research.
More Info: https://irsa.ipac.caltech.edu/data/UCAC4/readme_u4.txt
Related Resources: Services that provide access to data in this resource: IRSA TAP service ivo://irsa.ipac/TAP [Res. ID]

	Data Coverage Information
	This section describes the data's coverage over the sky, frequency, and time. Wavebands covered: Optical

Available Service Interfaces

Simple Cone SearchXXSearch Me

This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:

https://irsa.ipac.caltech.edu/SCS?table=ucac4_sources&

Maximum search radius accepted: 180 degrees
Maximum number of matching records returned: 2147483647
This service will ignore the VERB input parameter.

	Table Access Protocol - Auxiliary ServiceXX
	This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data. VO Compliance: Level 2: This is a VO-compliant resource. Description: To access this resource via TAP, issue ADQL queries on the table named ucac4_sources. Available endpoints for the standard interface: https://irsa.ipac.caltech.edu/TAP

	Custom Service
	This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource. VO Compliance: Level 2: This is a VO-compliant resource. Available endpoints for this service interface: Interactive web page: https://irsa.ipac.caltech.edu/cgi-bin/Gator/nph-dd?catalog=ucac4_sources

Developed with the support of the National Science Foundation
under Cooperative Agreement AST0122449 with the Johns Hopkins University
The NAVO project is a member of the International Virtual Observatory Alliance

This NAVO Application is hosted by the Space Telescope Science Institute

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