[vsnet-chat 4503] Re: V1548 Aql

[aah@nofs.navy.mil]

Didier Favre wrote:
>This could explain the difference around 1 magnitude of all my
>measurements.
>HJD        V (st6 without filter)      errors
>52056.934        12.34                  0.13
>52061.927        12.45                  0.17
My measure close in time was
> 52061.8915 13.571  1.541  1.529  0.783  0.003  0.004  0.002  0.001
I don't know how Favre calculated Vmag for his st6 system; which
comparison stars were used?  Note from my m67 paper
http://ftp.nofs.navy.mil/pub/outgoing/aah/m67
the response for a TC241 as used in the st6 is midway
between V and R.  Depending on the color of the comparison
stars, I could easily imagine a systematic error of this size
for unfiltered measures of such a red object.  Why not
purchase and use a standard filter?
Arne

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp