Anyone have any observations of open cluster NGC 7423. It is 15th magnitude and 6' in size. In Cep. Seems like it would be a real challange, if not impossible...
Here is from my observing notes with an 8" SCT: "med.sz, rich, irreg. shape, v.faint *s,only few above scope lim., poorly detached except by magnitude, mostly...
Cliff: Here are my notes from a 1999 observation. The site is located on the outer fringes of the Washington, DC suburbs, a mile east of Middleburg, VA....
I'm enjoying myself using my new book, Celestial Sampler, by Sue French. Having been even more intrigued by the double stars Sue pointed in some open clusters...
... Ron, the answer obviously is: they didn't! Many of the double stars recorded by the pros turned out to be optical double stars, i.e. two stars that...
Wouter has given the correct basic answer: in general nobody knows ahead of time, and for vast numbers we still don't know. A lot of the moderately-faint,...
Brian Skiff
bas@...
Feb 3, 2006 1:06 am
17383
This past Tuesday night (1/31), I enjoyed clear weather and good observing at Anderson Mesa. NGC 1514, NGC 2174, IC 443 and NGC 2359 (Thor's Helmet) were on...
Hi Bill, ... About a week ago I had alook at this nebula with my 6" newt from a reasonably dark site. At 33x with no filters I could definately make out some...
... Hi Bill, thanks for your very interessting objects and scetches. ... Yes, a very strange PN :-)) I thought very similar, when I saw this PN at my first...
Howdy all; I had a chance to get out of Phoenix on Wednesday night and get in some observing. I took the RFT refractor and some binoculars for a Wide Field ...
If you are missing it due to inclement weather it looked like this at 2030 hrs PDT on Jan 30/06. http://victoria.rasc.ca/gallery/Bill/images/2006.01.31- ...
I have been discussing William Herschel with a friend. we find conflicting information on his 20' scope that he used for most observations in his catalog. I...
Cliff; The telescope that William Herschel used to discover many of the objects in the NGC had a focal length of 20 feet and an aperture of 18.7 inches. He ...
Hi Steve, ... I was at Greenwich Observatory two years ago and there part of the 20 foot telescope was on display. I didn't know beforehand that it was there...
Cliff The commonly quoted size of the Herschel (the so-called "large") 20' reflector is 18.7" but the clear aperture is 18.25" (an iron band used to secure the...
Herschel's "Large 20 foot" had a metal mirror of 18.8 inches aperture. See History of the Telescope by King. Watson's Stargazer lists the mirror as 18.7...
... Ah ok sorry, I got mixed up. Part of the 48" telescope is at display in Greenwich. Wouter -- People: "If she weighs the same as a Duck, she's made of...
... Allow me to amend that statement: I just found a reference to a 24 inch aperture mirror that Herschel made much later of 10 foot length called the "X...
... Herschel did use a 20' telescope with an aperture of 18.7" for most of his observations. He made also a "large 10 feet" telescope described as "X feet" ...
Thank you, Mike, for the detailed notes. For what it is worth, I'm trying to "correct" the Simeis catalogue. Not surprisingly, it contains a fair number of...
Here's a relevant passage from Herschel's "Catalogue of One Thousand new Nebulae and Clusters of Stars" as published in "The Scientific Papers of Sir William...
The 20 foot is still at the Air & Space Museum in DC. I took these photos in 2002 soon after it opened. http://ladyandtramp.com/explore_universe/ Walked...
... Now all you need is to make sure the "inch" circa 1780 is the same as now! \Brian...
Brian Skiff
bas@...
Feb 5, 2006 8:39 pm
17402
... According to WikiPedia, see http://en.wikipedia.org/wiki/Inch the current value of the "inch" was defined in 1958. Unfortunately, it only says that before...
Thanks to Dave R for reminding me to look at the problem field of van den Bergh 87 and its associated stars. I agree with Mike K that the magnitudes in the...
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