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Re: (meteorobs) Which kind of measurement of photographic magnitude did DMS used?



Hello Xiaoyun Ma,

The magnitudes listed with DMS photographic orbits are visual peak
magnitudes. They are visual estimates by visual observers who saw the meteor
that was photographed and estimated its magnitude (and provided the time for
the meteor appearance!). A few are simple estimates from the appearance of
the meteor on the negative. Except for a handfull of fireballs, none have
their origin in photometry of the negatives.

- Marco Langbroek
  Dutch Meteor Society (DMS)




----------
Drs Marco Langbroek

marco.langbroek@wanadoodot nl
meteorites@dmsweb.org
http://home.wanadoodot nl/marco.langbroek

"What seest thou else
 In the dark backward and abysm of time?"

                            William Shakespeare
                            The Tempest act I scene 2
----------
----- Original Message -----
From: "Xiaoyun Ma" <Xiaoyun_Ma@Hotmail.com>
To: <meteorobs@atmob.org>
Sent: Tuesday, July 29, 2003 4:50 PM
Subject: (meteorobs) Which kind of measurement of photographic magnitude did
DMS used?


> Hi all,
>
> After an overview of DMS's photographic meteor orbital database, I found a
> question that how did they know the Visual Magnitude (Mv) of a
photographic
> meteor? And witch kind of magnitude is? a B system magnitude? or a V
system
> magnitude?
> Who can help me?
>
> Thank you very much!
>
> Xiaoyun Ma
> 07/29/2003
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