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On Saturday, May 10, 2003, at 03:43 PM, Sebastian Otero wrote:
>> HadV98 20030428.641 10.07V Kis.VSOLJ
>
> Is it a typing error for 11.07??
Sorry, it is typo, of course,
HadV98 20030428.641 11.07V Kis.VSOLJ
is correct.
>> SCTR 20030410.742 4.86V Kis.VSOLJ
>
> It wasn't this bright at all!
I think there is some different between V and visual magnitude in red
star such as R Sct.
And I think that it also depend on my comparison star, Tycho
5126-355-1 that is the only star is suitable for comparison on my CCD
field.
Exact zero point might be some different.
In the case of alpha Ori and delta Sco, it has much different reason.
In April I have some experiment to observe bright star with my
telescope (D=250 mm) and CCD camera.
I know they are not suitable for such very bright stars.
These star is saturated even in short exposure time.
And there is no suitable comparison star in very narrow CCD field
(30'X30').
So, I take 50 or more images of very very short exposure (0.01 sec.)
and stack these images.
And I use 8 or 9 magnitude star as comparison.
Contrary against my expectation, result is not good.
I posted this preliminary results to local BBS with remark that It is
not reliable results and magnitude is definitely incorrect.
Dr. Kato kindly reposted to Vsnet these results but with no remark.
Sorry for posting of reliable and experimental result.
Seiichiro Kiyota
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
