Re: USNO A2.0 "R"

[Bill Dillon <bdillon@houston.geoquest.slb.com>]

Michael Koppelman wrote:

> 
> It brings me back to my question, which I haven't found an
> answer for, which is what does USNO mean by R?

I believe it doesn't mean much more than they scanned the red-sensitive
Palomar survey plates.  Somewhere I've saved a Brian Skiff email on the
subject; I think the bottom line is that USNO magnitudes should not be
used for photometric calibration or reference.

Regards,

--Bill Dillon