From: "hpholcomb" <hpholcomb@yahoo.com>

Date: July 31, 2008 3:06:17 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: First Light with PGR GRAS14S5M Camera-Filters????


Milton,


Sorry, for some reason I though you were in Toronto!  Yes, Calgary is "up there"!


Since you must have become somewhat of an expert at dealing with anthropogenic (being 

a geologist, you'll appreciate that adjective!!) light pollution, do you use any filters in your 

work?  You may have mentioned them in other posts, but this would be a good place for 

restating that.


Thanks.


Perry




--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@...> wrote:



On 31-Jul-08, at 2:18 PM, hpholcomb wrote:


Hey Milton,


It's a wonder you got anything at all!  I can see the effect of the  

wind.


Yep. The motors for both Ra/Dec got a good workout last night trying  

to compensate for turbulence and wind.


So you now live at 52 deg. north latitude, having remembered the  

Arctic Circle is at 66

deg. + some minutes.  Gee, that's above Winnipeg!!


Actually I'm at 51° 1 minute so it's 15.5 degrees south of the Arctic  

circle. I'd forgotten that the Arctic Circle isn't at 65°, which is  

odd cause I use to live well north of it (70 to 75°N) when I was a  

mining geologist. Winters up there are interesting as the sun never  

rises much above the horizon. Summers are worse cause your always in  

twilight and that screws up your internal clock making it hard to sleep.


Whereforeareyounow??


Still in Calgary, but 8 km south from the city core where I used to  

live. On a good night i can almost see Mag 4.5 visually here. At the  

old place a good night was Mag 2 near the downtown core, which has  

non stop construction and light pollution among other things going  

on.  Also I now have the entire western sky to look at as there is no  

overhanging balcony to hide the stars anymore. To get Mag 5 or better  

skies, I need to move at least 100 km from Calgary's city boundary,  

which has kept growing bigger and bigger each year as people flock  

here looking for work.


TTYL..


Milton J. Aupperle