[AZ-Observing] Re: Imaging all of the Messier Objects at the Antenna Site
- From: Dan Heim <dan@xxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sat, 02 Apr 2011 15:44:45 -0700
Howard: Nice going on the MM. Can't wait to see the shots on your website.
Puzzled about one comment ... you say you will modify the software to
take atmospheric refraction into account. No doubt there's a
mathematical model out there somewhere that gives you refraction angle
vs. elevation. But wouldn't changes in temperature, pressure, and
humidity also have an impact? I guess what I don't know (lacking the
model) is whether these other factors would be "second order" to
elevation, and not significantly affect the model's predictions. If so,
you'd need to be adjusting your model maybe several times a night.
What's your take on this? Other readers have any insights? Can (has)
this been done?
Dan
On 4/2/2011 3:28 PM, Howard Anderson wrote:
> ... I will modify the software again to take refraction into account when
> moving to an
> object. Just had not thought the effect would be significant...
> Wrong.... Back yard
> tests did not show this because I cannot see low-angle items from my yard...
>
> Anyway, I am very happy with the results I obtained... They are
> definitely NOT the
> greatest images I have taken of these objects but they were all taken in
> ONE NIGHT
> and, the Trifid nebula (for example) is showing GREAT color...
>
> LX-200 "Classic" 10" f6.3 operating at f/5.61, TCF-S temperature compensated
> focuser, SBIG ST-4000XCM one-shot color camera.
>
> Thanks,
>
> Howard C. Anderson
> http://www.astroshow.com
> http://www.azcendant.com
> http://www.shastadaylight.com
>
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