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Happened to notice in a recent paper by Mamjek et al. (2002AJ....124.1670M)
a set of transformations for the Tycho photometry. In their appendix C,
they claim the following equations fit Bessell's relations to within
1-2 millimag:
for -0.25 < (BT-VT) < 2.0:
V = VT + 9.7E-04 - 1.334E-01(BT-VT) + 5.486E-02(BT-VT)^2 - 1.998E-02(BT-VT)^3
for 0.5 < (BT-VT) < 2.0:
B-V = (BT-VT) + 7.813E-03(BT-VT) - 1.489E-01(BT-VT)^2 + 3.384E-02(BT-VT)^3
for -0.25 < (BT-VT) < 0.5:
B-V = (BT-VT) - 0.006 -1.069E-01(BT-VT) + 1.459E-01(BT-VT)^2
N.B. the different fit for B-V for the bluest stars.
\Brian
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