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From John Greaves:
For 2MASS J-Ks of -0.2 to 1.2
For V ~ 9 to 14
For r'_CMT ~ 9 to 14 (from CMC13)
and using V^ to denote calculated V (would normally be written as a V with an
arret immediately above it)
V^ = 0.6(J-Ks) + r'_CMT - 0.03 (+/- 0.053)
(ie standard deviation of V^-V is 0.053)
Based on 18300+ Tass Mk IV Johnson V magnitudes good to +/- 0.1 in tandem with
CMC13 r'_CMT and 2MASS J-Ks (via UCAC2) selected from a circumsky +5 to +10
degree declination strip.
Extrapolation up to 15th magnitude may be healthy, r'_CMT starts to become
inreasingly scattered about 16.0, and especially so around 16.5.
Cheers
John
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
