[vsnet-chat 5368] Re: V4641 Sgr: July 8-9 data from Monard

["Toni Scarmato" <toniscarmato@hotmail.com>]

Hi Maciej.

In my 203 mm SCT, f/10, 70x, the star GSC 6848:3606 10.9 appear well
visible, and
GSC 6848:3245 11.9 is faint but easy visible.
During my observations on July 5 and 6 when I saw the variation of the
brightness I have thinked just
at the light flashes due at the parts of the eye that have a different light
sensivity.
(As you know, I am also comet observer and I use the method  of the adverted
vision to observe faint comet as C/2002 C1 at this moment).
Then I not Have reported observation of flares for July 5 and 6.
Instead, the nigth of July 7 during the observation I have observed some
light flashes in random positions, but
I Have observed the flares reported in the same position and with the
behaviour described, not using the adverted vision.
The night of July 8 and 9 I Have used also the 140x that reduce the
brightness of the background sky and the light flashes.
So I can confirm my observations.
Finally, if you look at my report on July 8 with my curve of light the
intervall time is just 1 minute. In fact, after the observation I write
the data immediately. The last nigth I Have observed again and I Have no
detect flares.

Repeat again that it is possible that my estimation are overestimated, but I
am really sure that SGRV4641 have had the behaviour described.



Best Regards,

Toni Scarmato







----- Original Message -----
From: "Maciej Reszelski" <macres@pro.onet.pl>
To: <vsnet-chat@kusastro.kyoto-u.ac.jp>
Sent: Friday, July 12, 2002 7:32 PM
Subject: [vsnet-chat 5367] Re: V4641 Sgr: July 8-9 data from Monard


>
>
> >
> > 20020708.916   119  (Maciej Reszelski)  !!!
> >
>
> Dear Toni, Taichi, Berto,
>
> The recent state is still for me suprise. Well I'm using a GSC
> standard stars that is the reason (I hope that my estimates are
> some up). I record some fluctuations with amplitude around
> 0.4 mag. It's agree with Gorjansky data. The estimates which
> pointed Toni is still mistery form me. First time I was watch star
> in real time second by secon. Toni, I don't saw any major changes
> but regarding 11.9 estimate. The field is low, and even with my 0.41
> m V4641 Sgr is not fairly visible. So when you observed some field
> very long human eye (or brain) may make some light flashes. I
> made durning this some 10s pauses between 50 s run. A few
> years ago I observed often meteors. Some observers and professionals
> know about phenomen of ghost meteors. As in the V4641 case the
> meteor event is very short. And when we make observation we watch
> using different parts of eye. Remeber these parts have a different light
> sensivity! When we changing some angle of view we may suspect
> some flares like these. I don't think so that existing any observer which
> make observation with 'static eye' :) And remeber about hard work
> of human eye when he make real-time observation.
>
> In the future. I recomended make observation one time per minute.
> It is much more better in this case, I think...
>
> Best regards,
> Maciej
>
>

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