NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-17 T01:50:49 PST
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For refcode 2009AJ....138..845O:
Retrieve 235 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2009AJ....138..845O Photometric Observations of Selected, Optically Bright Quasars for Space Interferometry Mission and Other Future Celestial Reference Frames Ojha, Roopesh; Zacharias, Norbert; Hennessy, Gregory S.; Gaume, Ralph A.; Johnston, Kenneth J. 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. Key words: astrometry; galaxies: photometry; quasars: general; reference systems
Retrieve 235 NED objects in this reference.
Please click here for ADS abstract

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