sukye » The ugriz Standard Star System
We assemble the guide newly created, the network name for the large &arcmin; g &arcmin; ur &arcmin; i &arcmin; z &arcmin; percolation system (see Fukugita et al. 1996). This type of major network has been developed at the U.S. Naval Observatory (USNO), Flagstaff Instal. These stars produce the basis for the photometric calibration of the Sloan Digital Sky have a bird's eye view (SDSS). The SDSS uses a 2.5-m telescope at Apache Meaning Observatory (APO) to a combination of five photometric calibrated digital imaging examination of π steradians (10,000 deg2) from the north galactic cap (Gunn et al. 1998; York et al.2000) as one of its products tomb figures.
This is not our intention here to describe in detail the complete end to end process of calibrating the SDSS photometric evidence. This is the field of study of a later period. Here, we simply ask our days, a self-contained record of the Beau-id first network on which the SDSS photometry is based. We note, however, that one of the targets of these cards is to earn a high consistency and accuracy, such as photometric errors throughout the RMS system in the SDSS photometric catalog will be set lower than 0.02 &arcmin; mag in r, 0.02 mag &arcmin; ri &arcmin; and &arcmin; g-r &arcmin;, and 0.03 mag &arcmin; u-g &arcmin; and I &arcmin;-z &arcmin; for objects bluer than obscure M0. To intersect this goal, internal targets have been set to establish the accuracy of the paradigm guardian Shooting star system: the uncertainty on the magnitudes are calibrated for a good reason for educating inimitable guide should be ≤ 1, 5% u &arcmin;, ≤ 1% g &arcmin;, r & arcmin, and I &arcmin; and ≤ 1.5% at z &arcmin;. As we will demonstrate later in this analysis, we only call for all those goals, but behavior of stars.
In extension, we must write about it because of the small but weighty differences between the USNO filters and 2.5 m, 2.5 m from the Sauer published SDSS photometry systematically contradictory reasonable control of the U & g &arcmin; arcmin r &arcmin; i &arcmin; z &arcmin; system some-Plane percent &arcmin; gr &arcmin; i &arcmin;, and slightly higher for &arcmin; u and z &arcmin; (see Stoughton et al. 2002) . When the equations of alteration between u &arcmin; g &arcmin; r &arcmin; i &arcmin; z &arcmin; system and the 2.5 m SDSS photometry have been flawless robust, they will soon be made next to the astronomical community.(Note that the expected accuracy of these equations metamorphosis is included in the aforementioned budget flagitiousness bad for the photometric calibration of SDSS imaging catalog absolute....
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