[vsnet-chat 5] Re: Mira comparison stars

[Taichi Kato <tkato>]

Robert J. Modic wrote:

> If observers viewed these stars in focus and with direct vision, Alpha
> Cet would appear 0.2-0.3 mags brighter than its V mag.

   Am I correct to interpret this as the effect of different wavelength
response of diurnal vision to the V-band?  I first thought the reported
effect was caused by the diurnal sensitivity of the eye under strongly
light-polluted sky of Japan which usually disables dark adaptation.
I also thought of chromatic abberation of the eye, which in near-sighted
vision will produce a better focused image of a redder star.

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

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