PHOTOMETRIC OBSERVATIONS OF SELECTED, OPTICALLY BRIGHT QUASARS FOR SPACE INTERFEROMETRY MISSION AND OTHER FUTURE CELESTIAL REFERENCE FRAMES
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https://doi.org/10.1088%2F0004-6256%2F138%2F3%2F845
http://hdl.handle.net/11603/18239
http://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2009AJ....138..845O
https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2009AJ....138..845O
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AJ/138/845
http://hdl.handle.net/11603/18239
http://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2009AJ....138..845O
https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2009AJ....138..845O
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AJ/138/845
Author/Creator ORCID
Date
2009-07-31
Type of Work
Department
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Citation of Original Publication
Roopesh Ojha,Norbert Zacharias, Gregory S. Hennessy, Ralph A. Gaume, Kenneth J. Johnston, PHOTOMETRIC OBSERVATIONS OF SELECTED, OPTICALLY BRIGHT QUASARS FOR SPACE INTERFEROMETRY MISSION AND OTHER FUTURE CELESTIAL REFERENCE FRAMES, The Astronomical Journal, Volume 138, Number 3, https://doi.org/10.1088%2F0004-6256%2F138%2F3%2F845
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Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
Subjects
Abstract
Photometric observations of 235 extragalactic objects that are potential targets for the Space Interferometry Mission (SIM) are presented. Mean B, V, R, I magnitudes at the 5% level are obtained at 1-4 epochs between 2005 and 2007 using the 1 m telescopes at Cerro Tololo Inter-American Observatory and the Naval Observatory Flagstaff Station. Of the 134 sources that have V magnitudes in the Veron & Veron-Cetty catalog, a difference of over 1.0 mag is found for the observed-catalog magnitudes for about 36% of the common sources, and 10 sources show over 3 mag difference. Our first set of observations presented here form the basis of a long-term photometric variability study of the selected reference frame sources to assist in mission target selection and to support QSO multicolor photometric variability studies in general.