[Aavso-photometry] 2MASS to Rc transform

[Arne Henden]

The paper in question is Carpenter, J. K., "Color Transformations
for the 2MASS Second Incremental Data Release," 2001, AJ 121, 2851.
It is a good paper to read to see the variety of near-IR systems
that call themselves "standard."  However, it is basically a paper
that gives transformations from one JHK system to another JHK system.
To go to Rc requires extrapolation, which never works, especially
over such a wide wavelength range.
   What people often do is to use a set of known standard stars and
create a transformation from, say, V and (V-K), to Rc.  This works
at an approximate level and is what I would do, since you can get
"V" from Tycho, TASS or ASAS and "K" from 2MASS.  I think Doug West
was trying a transformation like this, but I don't know of any
published results from anyone.
Arne

Michael Koppelman wrote:
> Is there such a thing? I found a paper by Carpenter (2001) that has a 
> lot of transforms for 2MASS but it seems to lack this one as far as I 
> can tell.
> 
> Thanks!
> 
> Cheers,
> Michael Koppelman
> http://www.lolife.com/astronomy/
> 
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