[vsnet-chat 3473] transforming Johnson-Cousins to SDSS passbands

[Stupendous Man <richmond@a188-l009.rit.edu>]

  John Greaves recently wrote:

> When the SDSS gets fully underway, and later still data returns from the
> USNO FAME mission to be launched in 2004 [????], we'll all have to
> figure out how to use [modified] gunn u'g'r'i' photometry to recover
> normal V and I etc.,

  The SDSS photometric system has not yet been completely defined,
but an early description of the system is available in Fukugita et al.,
AJ 111, 1748 (1996).  See

       http://adsabs.harvard.edu/cgi-bin/bib_query?1996AJ....111.1748F

  The paper contains equations which convert approximately from 
the Johnson-Cousins system to the expected SDSS system.  

  The actual SDSS system should be defined within another year or so.

                                                Michael Richmond

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