Re: [APML] Comet Linear C/2000 WM1

["Frank Holub" <lists@my-spot.com>]

Honestly, I didn't even try to guide on the comet using the ST-4 control box by itself. I only used ccdtrack so I could "see" what I was guiding on was in fact the comet. I'm sure (now that I think about it) I could have used the box alone without an issue. 
When doing "normal" autoguiding I much prefer to use the box by itself so I get the fastest corrections. With ccdtrack, there is at least a 2 second delay from the time of exposure until a correction is made due to downloading overhead. I have found that in my case it works best to use the fastest correction times possible. To do so I often do "crazy" things like using faint mode AND a boost of 4 to keep the correction times down below a second or so. I've never had the problems some report. In fact, since I "fixed" my G-11, My tracking has been awesome (mostly A1's at 1130mm guiding F.L.), I just can't focus consistantly...

Frank
http://www.my-spot.com

---------- Original Message ----------------------------------
From: "Tom & Lou Krajci" <krajcit@3lefties.com>
Reply-To: astro-photo@seds.org
Date: Wed, 28 Nov 2001 20:08:08 -0700

>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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