From: Milton Aupperle <milton@outcastsoft.com>

Date: March 24, 2010 10:44:43 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Autoguiding on solar protuberances


Dear Olivier;


I don't have a hAlpha scope to test this with and as far as I know, no one I've never guided on Solar prominence. I've tested tested with Sunspots (inverted), stars, planets, comets and the moon in the past.


The issue with prominence  will be that they change position, shape and brightness erratically, which makes it pretty difficult to track a specific "feature" as it disappears. Additionally you usually get those sorts of changes from turbulence too, which makes it doubly difficult.


As I said before, without seeing what your trying to track as a grabbed frame and some of your log information, it's impossible to offer an opinion or guess at what is happening in your case.


HTH..


Milton Aupperle



On 24-Mar-10, at 10:21 AM, astroc wrote:




Hello,


maybe my question is not clear. I have no problems using AstroIIDC, but I would want to know if it is possible to track on solar prominences in halpha ? The autoguide option don't seem to be able to guide correctly on prominces. It works well on Stars and sunspots, but it don't recognize and track correctly prominences on videos.


Olivier



Dear Olivier;


On 24-Mar-10, at 4:58 AM, astroc wrote:

Hello,


I use AstroIIDC with Vixen Sphinx and GPUSB Shoestring interface to autoguide. I would want if it is possible to use AstroIIDC to guide on protuberances ? The option Solar Tracking don't seem to be well suited for this application. Another possibility with AstroIIDC ?


Support requests are to be sent directly to our e-mail address at:


http://www.outcastsoft.com/ASCASTROIIDC.html#SUPPORT


We will need to see sample images of what your protuberances look like (grab a frame of your intended target), your CAP logs,  your guiding logs,  your telescope information and details on the mount  (i.e. model number, is it in Equatorial orientation or Alt Azimuth, is it properly polar aligned) etc. That information gets lost in Yahoo postings, so send it directly to us.


Thanks in advance..


Milton J. Aupperle