articleThe Astronomical JournalJan 14, 2013BRONZE OA

THE FOURTH US NAVAL OBSERVATORY CCD ASTROGRAPH CATALOG (UCAC4)

NZN. ZachariasCTCharlie T. FinchTMTerrence M. GirardAHA. HendenJBJennifer Bartlett

United States Naval Observatory · Yale University · +1 more institution

Indexed inarxivcrossrefdoaj

Abstract

The fourth United States Naval Observatory (USNO) CCD Astrograph Catalog, UCAC4 was released in August 2012 (double-sided DVD and CDS data center Vizier catalog I/322). It is the final release in this series and contains over 113 million objects; over 105 million of them with proper motions. UCAC4 is an updated version of UCAC3 with about the same number of stars also covering all-sky. Bugs were fixed, Schmidt plate survey data were avoided, and precise 5-band photometry were added. Astrograph observations have been supplemented for bright stars by FK6, Hipparcos and Tycho-2 data to compile a UCAC4 star catalog complete to about magnitude R = 16. Epoch 1998 to 2004 positions are obtained from observations with…

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Topics
Keywords
  • Physics
  • Photometry (optics)
  • Observatory
  • Stars
  • Proper motion
  • Sky
  • Astronomy
  • Astrophysics
UN Sustainable Development Goals
  • Life below water
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