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(Equinox 1950.0)
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(Equinox 1950.0)
This section contains lists of magnitudes, colours and positions of a number of photometric standards which have been compiled from photometry and astrometry done at Kitt Peak and the Royal Greenwich Observatories.
It may be necessary to defocus the telescope in order to avoid saturation of the chip with exposures 1 sec to avoid scintillation noise.
The standard stars are so bright, in fact, that exposure values must be much shorter than the likely values used for your programme objects. Fainter standards (Appendix B) may be better suited and lean less heavily on linearity of the CCD and its shutter over a large dynamic range.
Note further that the Landolt I-band and that used by Christian et al is based on the Cousins definition, which matches the La Palma filter quite well, but the sequences by Stobie et al in Appendix B use an I-band based on the Gunn definition.
Transformations from CCD U observations and even B observations to the UBV system are not accurate.
Positions for these standards are kept in the files UBVRIKP.CAT and UBVRIRG.CAT. To use, type I(NPUT) UBVRIKP or I UBVRIRG on the User Interface. This will load the relevant catalogue into the telescope control program. It can be listed by typing L(IST), also on the User Interface.