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[vsnet-chat 6421] Re: Converting Tycho-2 magnitudes to Johnson-Cousins B,V

>                  B  = Bt + 0.018  - 0.2580*(Bt - Vt)
>                  V  = Vt + 0.008  - 0.0988*(Bt - Vt)

Michael,

Thanks for this information.
I have used these formulae with two extreme examples when V is 0.02 mag.
brighter and B-V is 0.05 mag. bluer:

eps Lup    3.37 -0.18 /  3.355 -0.165
Henden=   3.37 -0.18 /  3.364 -0.154

ups And     4.09  0.54 /  4.099  0.496
Henden=    4.09  0.54 /  4.102  0.501

It looks like the problem is still there specially for the B-V color.

A couple of more examples to check:

iot Lup      3.55 -0.18 /  3.517 -0.165
Henden=   3.55 -0.18 /  3.527 -0.153

gam Tuc    3.99  0.40 /  3.994  0.362
Henden=   3.99  0.40 /  3.999  0.368

So it is confirmed that the B-V is not improved at all and the B-V is
slightly improved for the blue stars but worsened for the redder ones (that
were okay).

Sebastian.

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