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Lady Isabella

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About Lady Isabella

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    Star Forming
  1. Hi Paul A most excellent sketch. I will stick my neck out and say that the spot is indeed real. I also observed it with my 102mm refractor.
  2. Hi Dan I think it's both of them. Looking at my observing logs, I notice that my best views of the craterlets cover a period starting a couple of days before and after the full moon. Even at full moon, I still manage to bag a couple. I once read an article that said that the full moon period was a good time to spot them, for they act like little radar dishes and reflect light back. At Full Moon, I tend to use a green filter which helps to highlight the bright little specks.
  3. Last night was amazing for the Plato craterlets. I turned my 102mm refractor ( magnification 200x) onto the moon and was gobsmacked to clearly see 4 craterlets. The view of craterlet A was the best I've ever seen. I've seen 4 before, but not like last night. The 4 were so clear, and all visible at the same time.
  4. Blimey Pete A great set of images. I was observing Plato last night and was taken by the shadows, your image really shows the shadow of the peak Gamma very well. You have also captured the craterlets extremely well. Last night I could not even pick up the centre one.
  5. Hi Paul Just compared your excellent sketch against mine made on the same evening at 18:10 UT, and my sketch ties in very well with yours. The cusps are bright, and it's interesting how the southern one extends more around the limb. (something that is showing up on all my recent observations). With you using a 203mm reflector, do you find that you have to use filters?
  6. Yesterday evening, Venus was visible in a break in the clouds, inspite of it snowing over the observatory. Could not resist in seeing how Venus would appear under such conditions (cloud features were visible in the reduced brightness of the planet) Fifteen minutes later, the roof was shut and it was no surprise to find everything coverd in 10mm of snow. The observation reminded me of the one made by Robert Stawell Ball on December 6th 1882, when he observed the transit of venus during snowy conditions.
  7. The long period variable star U Orionis reaches maximum brightness this month, and is currently visible in binoculars at around mag.7.5. It is a strong source of SiO, OH and water vapour maser emission. The star was discovered as being variable by J.E.Gore in 1885, and being close to Chi Ori makes it an easy to find object. Its typical range is mag 6.3 to 12.0 over a period of 368 days. 0.7' west of U Ori is the eclipsing binary star UW Ori.
  8. The carbon rich star R CrB, appears to be heading to an all time low. Its fade started in July 2007, when it was an easy binocular object of the 6th magnitude. Over the last couple of months, I've been estimating its brightness at around magnitude 14.5 from images taken with a Canon DSLR and 120mm f/8 refractor. AAVSO data and charts can be found here: http://www.aavso.org/publications/specialnotice/145.shtml
  9. Before buying a filter, I would have a go at making an Hexagonal mask. http://www.carbonar.es/s33/Articles/WhoWasThatMaskedDoubleStar.pdf
  10. This wonderful work has been posted on "Cloudy nights" by PJ Anway. There is a link where you can download the book. http://www.munisingwebsites.com/lookum/log/1011.html Also check out his website, wonderful double-star material on there. http://www.munisingwebsites.com/lookum/index.html
  11. This take by Roland Christen on flourite/fluorite http://www.cloudynights.com/item.php?item_id=388
  12. No doubt the dealer was peeved because you went for a TMB, for Takahashi have been building triplet refractors for 40 years now. The first one decribed as semi-apochromat was built in 1969, then in 1972 they brought out an 80mm fluorite triplet scope. Five years later a 90mm model was introduced. By 1983, the FCT range was in development with many models hitting the market by 1985. Over the years I've been fortunate to look through many fine and splendid refractors from different makers. But I have to say that one of the best scopes I have is my 30 year old Towa 80mm f/15 Achromat with its standard magnesium lens coatings. The planetary and double star views are simply stunning.
  13. Just as an interesting note, Sir John Herschel tells us about object-glasses built by Dr.Blair, that were free from chromatic and spherical aberration. These were made some 25 years before the Cooke triplet lenses. When the Cooke p-v scopes came out, they were regarded as being excellent, sadly for Cooke's, the new Schott glass that was used turned out to be reactive with the elements. This led to much public mud-slinging, with claim and counter-claim being made. A nice article on the whole episode can be seen here: http://www.europa.com/~telscope/hdtaylor.txt
  14. You could try using an aperture mask (70 -80mm), as Venus is showing some cloud features at the moment. I made a sketch about 8 hours before this chap in America: http://www.cloudynights.com/ubbthreads/attachments/2881841-01.22.09%20CED%202%20Venus%20by%20So%20copy.JPG While Sol Robbins has captured more detail in his sketch, I did managed to pick out the major cloud features that he shows, also the shape of the terminator. p.s. I also used a yellow filter.
  15. A great book indeed, the sections on telescope testing etc are superb. John Benson died on the 13th July 1958, aged just 42. Had he lived longer, then I'm sure the book would have been up-dated. A real shame, for this book is indeed a real classic.
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