[Prev][Next][Index][Thread]
(meteorobs) Re: meteorobs-digest V4 #1100 - Answered
>
> ------------------------------
>
> Date: Wed, 26 Feb 2003 13:35:43 +0100
> From: Daniel Gruen <d.gruen@tiscali-dsldot de>
> Subject: (meteorobs) Re: Nice figures
>
> Hi!
>
> > 1)Did you plot all these figures during the the lightfloods or after=20
> > the your football team gave up playing?
>
> I think it was only a training session and yes, they stopped by the=20
> time I started the real observation (and the football site is=20
> south-east of me, which is a bad part of the sky due to more light=20
> pollution anyway. I'm actually living right at the border of strong=20
> light pollution from Stuttgart, which makes that part of the sky=20
> quite unenjoyable).
________________
That's nice! Thanks for your answer.
________________
>
> > 2)Did you light on your figures, or were you desesperately waiting
> > for a good time? I mean, dark skies conditions?
>
> Your answer) - Maybe I don't quite understand what you mean by that
question. If you=20
> are referring to the limiting magnitude, it's around five most of the=20
> time at my site (unless there's moonlight or haze), and we have quite=20
> clear winter nights right now here in southwestern Germany. I=20
> determine the lm by marking some of the faintest stars I can still=20
> see on a sky map, as the normal "counting fields" method has often=20
> resulted in contrary results (over 0.5mag difference between two=20
> fields on the same evening). The magnitudes of these stars can be=20
> checked using http://www.nofs.navy.mil/data/FchPix/ if the stars are=20
> not in the Flamesteed catalogue.
_______________________
Satisfied. Your answer is just of what I expected for. Probably, when you
mentioned that you "didn't understand my question" is (probably) because I
used an expression that means many things, such as: light on - "find
occasionally while observing or to go hard into the subject... Well, in most
of the cases, I, usually, determine my observation site based in known
constellations, i.e.: Musca, Antlia, Centaurus and so. It works fine.
Besides, it gives chances for many of us get the meaning of the figures in
an easier way.
Obs - By the way, I can't download your posted link. It doesn't matter. I
take adavantage to politely ask to the Meterobs in order to add some links
about this item (new charts, possible?).
_________________________
>
> > 3)Even not refering the weather conditions, it seems to me that your
> > magnitudes on showers were very brilliant for the time. Just see
> > your figures posted on magnitude table.
>
> "...If you are referring to the meteor magnitudes, observations like
these=20
> with only 3-4 meteors probably can't give any statistically=20
> interesting numbers. If you have any further questions, please post=20
> the lines of the report that are of interest for you..."
Commentaries: No, that's Ok too - What I meant is that you plotted "-3-4"
(magnitudes) meteors!!! That's almost a fireball!!!That's too much nice for
an observer. Therefore, since you explained that, even during the winter
season you had cloudless and dark skies along you observation, I do not have
any more question about your posted figures. Again, I would like to
congratulate you for the the results. That's very much clear.
>
>
> > Sincerely,
> >
> > Marco Valois
_________________________________
>
> Date: Thu, 27 Feb 2003 16:55:42 +0800
> From: "Huan Meng" <meteorobs_menhu@hotmail.com>
> Subject: (meteorobs) Fireball over Beijing and Tianjin
>
> "...Yesterday, many amateur astronomers Tianjin (a city to the southeast
of
> Beijing) reported that they saw a big fireball at 07h15m (LT, equivalent
> 23h15m UT). The appearence of fireball was not seen, but ended at about 20
> degrees above the..." > Today, I just got known some people in Beijing
also watched this phenomenon..."
>
"...The time was just 1 minutes earlier, i.e. 07h14m LT. Observers in
Beijing
> reported the fireball appear at about 60 degrees above the east horizon,
> from northwest to southeast, rushed with medium speed. Someone said the
> fireball was even brighter than the sun!..."
______________________________
Comments)We understand that many people while observing a meteor like that,
are compelled to add more than it really shows... "Brigther than the Sun"
means something like 27m!!! You said about "10!"It give me the feeling that
it almost cleared up all skies as it passed away. So, it sounds as almost
"impossible" that someone couldn't see the brithness (?)
__________________________
> "...I'm now wondering if we can find any meteorite of this fireball
somewhere?
> Any suggestion? or how to calculate the position of it/them?
> PS, the distance between Beijing and Tianjin was precisely 120km..."
>
> Best wishes and Clear skies!
>
> Huan
________________
Answer)I had chances to see some of these meteors (most of them, I
considered as fireballs). Once, I posted a relate almost like that, and I
will give you the same answer to my questions at that time. I hope this can
fit your interests. Is this: There's a Mathematic calculus that can brigther
your doubts. Try to meet Dr. Lew Gramer. He's always able to help many of us
in doubts like that. In my case, I didn't go further because I'm not really
into calculus to meet meteorites, and besides, most of the meteors observed
by me, happened in such a long time! Better luck!
Clear skies,
Marco Valois from Recife
>
>
The archive and Web site for our list is at http://www.meteorobs.org
To stop getting all email from the 'meteorobs' lists, use our Webform:
http://www.meteorobs.org/subscribe.html