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> I didn't know there was a (small) color term in the Geneva V. I _do_ > know there is a cyclic error as a function of _RA_ due to a closing error > in the standard system. This was found by Cousins & Menzies when they > compared the SAAO observations of Landolt standards against Geneva, > Walraven, and E-region standards. No RA-error problem in the E-region, > Landolt, or Walraven, but there was in the Geneva and SAAO data. The color-term is present all over the sky regardless RA so this might be a different thing. I have found all these differences while prepapring photometric sequences for visual observing. In short, you have (approximately): B-V / Geneva V-Johnson's V -0.3 / -0.017 0.0 / -0.014 0.3 / -0.010 0.6 / -0.007 0.9 / -0.004 1.2 / -0.002 1.3 / 0 1.4 / 0.004 1.5 / 0.009 1.6 / 0.012 1.7 / 0.015 I am preparing a webpage with lots of tables of this kind, to make use of all the data available on different systems that can be transformed to Johnson's UBV. I hope it will be online in a couple of weeks. Regards, Sebastian.
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
