View Single Post
  #9  
Old 17-01-2017, 01:54 PM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 3,052
Quote:
Originally Posted by ericwbenson View Post
In my garden in Adelaide, 2" is very rare night, 3-4" is common and worse is not uncommon. Looking at a defocused star at high power one can see the very fast wave moving across the disk, from what I read it's from higher altitude currents, I wonder if it's heat coming off the city mixing with higher wind currents.
However in Arkaroola I can generally bang out 20-30hr images with average 1.6", worst case 1.8" especially if the target is a bit lower. The good nights are usually 1.2"-1.5", really good is 1.0"-1.2", though that is pretty rare especially away from zenith. I usually throw away any L frame > 2", color I'll keep up to 2.4" ish if I have too since it has less impact to the result.

EB
Hi Eric,

It's interesting that you should mention Arkaroola, as I just visited a web page about the observatory there, as a result of web-browsing seeing conditions based on interest created in this thread.

Anyway, I thought you all might be interested in this comment, although based on 50 year old data....

"For those of you with a technical mind, the seeing conditions at Mt. Searle (only 47 km to the south-west) were measured in 1965 by the Australian National University (ANU) and reported as being a mean of 0.45 arc-seconds, with seeing better than 0.35 arc-seconds on 36% of nights. Our night skies are truly spectacular! "

Here is the page: https://www.arkaroola.com.au/astronomy.php

Can anyone vouch for the nearby Mt. Searle ?

Maybe it's a small world and someone here, is from there.

Best
JA
Reply With Quote