[Aavso-photometry] Re: How cold is too cold?

[Lew Cook]

Light bulbs will last forever if you wire 2 equal bulbs in series.
Dim, yellow light, but you don't care about the light, do you?
Lew


On Thu, 6 Jan 2005 12:31:13 +0200, Arto.Oksanen at tietoenator.com
<Arto.Oksanen at tietoenator.com> wrote:
> After relubricating (and replacing the RA drive assembly!) the 10-inch Meade LX200 it has also worked in cold temperatures.
> 
> We use small heaters under both telescopes to keep them dry from frosting and condensation. Before we also used light bulbs, but as they dont last too long we got new heaters. The new heaters are very compact 15x10x5 cm and have no moving parts. They have regulated inside temperature of 100 C and radiators on the outside surface.
> 
> arto
> --
> Arto Oksanen                         arto.oksanen at jklsirius.fi
> Jyvaskylan Sirius ry, Kyllikinkatu 1, FI-40100 Jyväskylä, Finland
> Tel: +358-40-5659438                         Fax: +358-14-4157803
> Nyrola Observatory  http://www.ursa.fi/sirius/nytt/nytt_info.html
> 
> -----Original Message-----
> From: aavso-photometry-bounces at mira.aavso.org [mailto:aavso-photometry-bounces at mira.aavso.org] On Behalf Of Geir Klingenberg
> Sent: 6. tammikuuta 2005 2:18
> To: aavso-photometry at aavso.org
> Subject: Re: [Aavso-photometry] Re: How cold is too cold?
> 
> Hi
> 
> On Wed,  5 Jan 2005 20:53:54 +0200, Pertti Pääkkönen
> <ppaakko at cc.joensuu.fi> wrote:
> > After this adventure I had to recover two hours in extremely hot sauna!
> 
> Yeah, I believe it! I hate to freeze and that is one of the reasons
> why I built my backyard observatory, so now I can control my telescope
> from indoors while having a warm cup of coffee ;-)
> 
> As Michael K. I had problems with my mount below -15 deg C or so. I
> removed the lubricants and used some synthetic stuff instead and there
> has been no problems since.
> 
> I keep the CCD camera (ST-7) mounted to the telescope and it cold
> starts without problems. But the PC has to be warm started. Other than
> that I have not had any problems with the electronics in the
> observatory (I have been observing down to -25 deg C).
> 
> I am more worried about humidity than cold, so I cover up the
> telescope and use a 60 W light bulb inside the cover to prevent
> condensation. I believe it is more stressful for the camera to be
> taken from +25 C to -25 C and back than keeping it in the observatory
> as long as it is kept dry...?
> 
> Geir Klingenberg
> 
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-- 
Regards, Lew
CBA Concord 
http://www.lewcook.com/cbacal.htm