RE: Antwort: RE: [APML] Mercury and Comet Utsunomya

["Chris Schur" <cschur@cybertrails.com>]

Stefan, yes, they both generally do, but the ion or gas tail points exactly
away from the sun, whereas the dust tail can separate when a comet is
rounding the sun because it has a significant mass, and separates out from
the gas.  In a dark sky, the ion tail will be blueish and the dust yellow,
but here the problem was the strong blue twilight made proper color
separation impossible.

Chris Schur

Astrophotography: http://www.psiaz.com/schur/astro/index.html


-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of stefan.beck@voba-schoenbuch.de
Sent: Monday, May 06, 2002 7:55 AM
To: - *astro-photo@seds.org
Subject: Antwort: RE: [APML] Mercury and Comet Utsunomya



Hi,

>used in front of the corrector plate.  Whichever tail point directly at the
>sun is the gas tail. I think its the left one.


maybe I misunderstand it but the gas or ion tail points always away from the
sun.


Stefan Beck

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>