NP-101 on a DM-6
Teeter 11" STS/Waite Mirror
Zeiss, Fujinon, Nikon, Vixen binoculars
Quote:In The Messier Objects, O'Meara says that on Mauna Kea, magnitude 8.5 stars are "within grasp of the naked eye..." (p.29) He also says the he "consistently detected stars as faint as 8.4 magnitude..." (p.31) The subject remains mysterious (for me), but then O'Meara probably sees better than an owl (some humans do).
The night sky is the canvas....
My optics are the brush....
The Milky Way is the masterpiece
reductio ad absurdum of epistomology is solipsism....
Quote:Thanks Brooks. I assume the same would be true of those sites in Antarctica or the Andes site that Tony Flanders was referring to, where Barbara Wilson (I hope I got the name right) saw every star in the second edition of Sky Atlas 2000.0.
First and foremost observing love: naked eye.
Last but not least, telescopes.
And I sometimes dabble with cameras.
Quote:I'm going to use the Andes site that Tony Flanders mentioned as an example of the "perfect" dark site (although I could use Mauna Kea or Antartica also- as all the panoramas are either built into the program or can be made.) Absent of any proof that anyone has seen any stars of dimmer than Mag 8.5, I think I'll set that as the minimum magnitude for this site, just so people can have an idea of what the sky looks like from an amazing location like this. I was just wondering if very young eyes or an even better location (like the Dome A and C and Ridge A in Antarctica) could offer even deeper seeing, closer to Mag 9.0 visually. The number of visible stars rises exponentially even with small increases in limiting magnitude.
Quote:I would say the limit is 18000 feet. Jack
14" Strut; 10"XT; 102ES; 22 in Process; 3.5,5,7,10,14,20mm Pentax XW; 17.3 & 12mm Delos; 27mm Panoptic; 20&24mm ES 68; 24mm ES 82; 30mm ES 82; 6&10mm BCO;
Quote:At 10,000 feet the observer is above 50% of the Earth's atmosphere.
Quote:You are mis-remembering. Only 25% of the atmosphere is below you at 10,000 feet. The 50% mark is reached at 18,000 feet -- coincidentally around the limit of long-term human survival. - Tony
Quote:From 3 separate citations I consulted: "6000-10,000 feet is the altitude range some people may start to experience problems related to altitude. AMS, or Acute Mountain Sickness symptoms may set in at any altitude above 6,000 feet. At 10,000 feet, the atmosphere is only 50% of that found at sea level."
Quote:So is viewing from 8.0 to 8.5 as rare as we might thing for the serious visual observer?
Quote:I think many people just share what they find and what they are capable of. However, I am suspicious that there are more people who can and do wonderful things and just don't publish them for whatever reason. Much like I know of several people that have done 12 or more of the AL programs but never put in for the reward. They know what they can do. Their close group of observing friends know what they can do and that is all that matters to them.
Quote:Yes. Amateur astronomy is a small world; if there were lots of people who could do this, I would know about it.[...]Sure, but among that close group of friends would be somebody I know, or somebody who knows somebody I know.
Quote:So astronomy's version of "Six Degrees of Kevin Bacon" is "Two Degrees of Tony Flanders".
Quote:This thread here indicates SQM readings of 22.1 or so consistent in the outback of western australia and namibia- higher readings also possible, but only under overcast skies. What does 22.1 translate to in terms of limiting magnitude?