Viewed Palomar 9/NGC 6717 last night in my 12" and am interested as to why it was included in the Palomar list since most are tiny very loose globulars and not...
... Isn't it? What's interesting to me is the apparent uneven illumination of the cluster (at least that's how it looks to me). Taken from my TSP 2004 notes : ...
Just wanted to give a quick update on Lowell Star Party III. Both Thursday and Friday nights were clear, with about 50 at the observing site on Thursday and 80...
... On Mars Hill, a few miles from the star party site, at the other end of the same lava flow, I thought the seeing was quite good Thursday using the Clark...
Brian Skiff
brian.skiff@...
Oct 1, 2005 6:33 pm
16511
... This calculator seems to indicate that the older you get, the deeper your limiting magnitude is. (?) -Alex...
... Yeah, I think that's a bug. I don't think it was carefully tested. It also says that given a reflector and refractor of the same aperture the reflector...
... I haven't read that S&T article, only the 1990 paper "Telescopic Limiting Magnitudes", so I don't know the equations used in the program. But one ...
... That's correct: a refactor does not see as faintly as a reflector. Given a constant % of reflectivity, the limiting magnitude of a reflector scales as the...
Hi, ... That's an interesting possibility (I'm still thinking about it) but I think there is a more simple explanation: not all the variables here are ...
Hi Mel, ... Very interesting! I'm not a much of a refractor person so I didn't know this. Yet, as far as I can see the Schaeffer model doesn't take the loss...
Greg, I really touched off a controversy, here. The calculator does appear to have some slight errors (fortunately, resulting in small discrepancies). A...
... Well, that's questionable. Modern small aperture refactors have better transmission characteristics than the typical small aperture reflector. ... ...
I know we all are, but I dropped in one of them .5k widefields in the 14" last night and just about dropped out of my seat. I mean, I've spent a lot of time...
Well Mel when you say "typical small aperture reflector" do you mean the budget ones sold to newbies or one of the more optimized instruments that would likely...
Nice drawing of Pal 12. I did not indicate in my notes any elongation. I'll have to revisit that on. My last observation was in Aug of 1996. It has been...
I was using a 7mm type 6 Nagler (214x) with an Orion XT12i. Really neat. Still can't figure why it was included in the Palomar list. Cliff ... illumination of ...
Also seems to mean that as you become a more mature amatuer it helps to get bigger telescopes to fight back against aged eyeballs. I suspect young teens ( and...
Seems it is necessary to "reverse-engineer" the program to understand the questionable results. The limiting "magnitude" of an incandescent point source as...
Heya The reason I asked my original question of limiting magnitude of 36" telescope was because I wanted to get first hand experiences of people who've...
There is a database "Faintest Object Observed" on the BigDob group that you can study: http://groups.yahoo.com/group/bigdob/database?method=reportRows&tbl=1 ...
... From: "gnowellsct" <tim71pos@...> ... Know what you mean.... the bright rectangle shows up really well in 200-inch Palomar pictures of M42 taken in...
Alister
aling@...
Oct 3, 2005 3:04 pm
16530
Hi, ... Yes, that's exactly what I've been saying all along. ... I think you are right, but it may be only half the problem. I have a lot of experience with...
I wonder how the rectangular illumination is achieved. Ordinarily one thinks of light as dimming with radius and thus sort of a circular affair, i.e., the...
I surfed for rectangular illuminated M42, but didn't find one. I did however find this: http://pk.darkhorizons.org/images/3d/m42-3d.jpg which is at least a...
understood and agreed! Using the Desert Coyote Observatory 30" f4.46 I see 17th mag galaxies pretty routinely... 18th are tougher but have been seen. The...
Hi, ... I'm sorry this is a bit of a rant, but you touched a nerve. With all due respect you sound like one of those people says "it's just a theory" and then...
Greg; I believe what you want to find is the famous drawing that was made with the Harvard 15 inch refractor in the 19th century. I remember it showing that ...
Greg, I think it is somewhere in between... I missed the statement of the original poster saying "I simply do not believe in it"... this I do not agree with (I...
