Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345515o&link_type=abstract
American Astronomical Society, AAS Meeting #213, #455.15; Bulletin of the American Astronomical Society, Vol. 41, p.356
Astronomy and Astrophysics
Astronomy
Scientific paper
Photometric observations of 235 extragalactic objects that are potential targets for the Space Interferometry Mission (SIM-PlanetQuest) are presented. Mean B,V,R,I magnitudes at the 5% level are obtained at 1 to 4 different epochs between 2005 and 2007 using the 1-meter telescopes at Cerro Tololo Inter-American Observatory and Naval Observatory Flagstaff Station. Of the 134 sources which 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 magnitudes 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 in general QSO multi-color photometric variability studies.
Gaume Ralph A.
Hennessy Greg S.
Johnston Ken J.
Ojha Roopesh
Zacharias Norbert
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