[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

[vsnet-chat 6759] Re: (fwd) Johnson V estimation from r'_CMT and 2MASS J-Ks

In a message dated 8/5/2003 7:23:43 PM Central Daylight Time, tkato@kusastro.kyoto-u.ac.jp writes:


  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


John:
Dumb question, I have seen a few references to CMC13 but I am not familiar with it.  What survey is it and where can I find it?
Thanks,
Doug West

Return to Home Page

Return to the Daisaku Nogami

vsnet-adm@kusastro.kyoto-u.ac.jp
Powered by ooruri technology