[vsnet-chat 4067] Re: Visual estimates accuracy

[Taichi Kato <tkato>]

Re: [vsnet-chat 4043] Visual estimates accuracy

> If we are not aware of these different responses of the eye and randomly
> observe with one vision or another, without taking care, results may be
> dissapointing, specially for stars like R Lep, that are very red and may
> completely disappear if we used averted vision for observing them. (I've
> noticed 1.4 mag. differences for that star, which is saying we are observing

   Incidentally, Kiyota-san obtained BVRc photometry of R Lep around the early
1999 maximum, which was well observed by a number of observers.  The star
had an average color index of B-V = +4.12.  The two observers who reported
magnitudes closest to Johnson V were S. Otero (v-V = +0.43) and M. Sato
(v-V = +0.41).  (v denotes visual observations)  The largest deviation from
Johnson V was seen in R. J. Bouma (v-V = +1.7) and R. J. Johanns (v-V = +1.6),
but most of other observations clustered around v-V = +1.0.  Perhaps S. Otero
is the world best visual "V-band" observer!

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

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