RE: [APML] Comet Linear C/2000 WM1

["Dale Ireland" <direland@drdale.com>]

I noticed some images that are ST4 guided on the nucleus and have a
relatively bright star streak almost through the nucleus. I am wondering how
the ST4 stays locked on the nucleus as a star passes so close to it during
guiding.
Dale

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Tom & Lou Krajci
Sent: Wednesday, November 28, 2001 7:08 PM
To: astro-photo@seds.org
Subject: Re: [APML] Comet Linear C/2000 WM1


From: "Frank Holub" <lists@my-spot.com>

>...The issue with the comet was more likely the fact that it was fairly
diffuse, in the ccdtrack display it looked more like a big blob then a
normal guide star's "dot".

Checking my recent CCD images of the comet...it has a very sharp brightness
profile around the nucleus, with a fairly bright coma...but it should be a
sharp enough 'point source' on which an ST-4 to guide at just about any
focal length and focal ratio.  Measuring the full width half maximum of the
nucleus...and comparing it to stars in the image...the comet's FWHM is about
2 - 2.5 times wider than stars...but I bet the ST-4 will centroid on it just
as well.

Recent CCD images (most recent stuff at the bottom)
http://members.3lefties.com/krajcit/C2000WM1.htm

Tom Krajci


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