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Pages: 1 leexeen scholastic sledgehammer Reged: 08/08/07 Loc: Beijing, China Porrima and Xi Uma in 60mm       #3135754 - 05/30/09 12:02 PM Edit   Reply   Quote Quick Reply   I just went out to observe with my 60mm refractor. I found the Porrima and Xi Uma all showed themselves as elongated Airy disks. Can't be defined as splited but can be felt as close doubles. Very nice experience! Post Extras:       nirvanix Pooh-Bah Reged: 06/07/07 Loc: Saskatoon, SK Re: Porrima and Xi Uma in 60mm [Re: leexeen]       #3135953 - 05/30/09 02:22 PM Edit   Reply   Quote Quick Reply   Hey, great work Lexeen! I think you cannot truly split those doubles with a 60mm scope, but at least you identified them as binaries. Post Extras:       Bonco Post Laureate Reged: 04/17/06 Loc: Florida Re: Porrima and Xi Uma in 60mm [Re: nirvanix]       #3137856 - 05/31/09 03:48 PM Edit   Reply   Quote Quick Reply   Lexeen, Star tested a newly aquired Tasco 80mm f/15 last night. xi Ursa Ma was very nice at 200X. I might have seen a split on occasion but a nice view and an obvious double in any case. Porrima on the other hand at 200X was elongated with no hint of a split, so I found xi to be the easier of the two. Cheers, Bill Post Extras:       CESDewar GorillAstronomer Reged: 01/16/05 Loc: Blue Ridge, GA, USA Re: Porrima and Xi Uma in 60mm [Re: Bonco]       #3155214 - 06/10/09 01:51 AM Edit   Reply   Quote Quick Reply   Seeing was at best average tonight with lousy transparency, so I decided to just take a quick peak at some doubles. I had my TV-60 out to look at Porrima with 2-4mm Nagler zoom. At 180x, I could definitely see the elongation. I even cranked it up to some ludicrous magnifications with a 2.5PowerMate. I was surprised at how good the image was at 360x, but with a super-lightweight mount it was rather difficult to track at that magnfication! But on one good pass, I got the impression of the elongation looking peanut shaped, but that was it. This same evening, Izar was a clean split, with the pale green secondary sitting on the first diffraction ring, and the double-double was a nice clean split too. Post Extras:       Bonco Post Laureate Reged: 04/17/06 Loc: Florida Re: Porrima and Xi Uma in 60mm [Re: CESDewar]       #3156233 - 06/10/09 06:10 PM Edit   Reply   Quote Quick Reply   I did a retest of my Tasco 80mm using modern 1 1/4 eyepieces and got a better view of Xi. The secondary had a greenish tinge and while marginal I'd say it was split about 50% of the time. It was a pleasing view. Porrima was just a better defined peanut compared to my previous test. Bill Post Extras:       leexeen scholastic sledgehammer Reged: 08/08/07 Loc: Beijing, China Re: Porrima and Xi Uma in 60mm [Re: Bonco]       #3156370 - 06/10/09 07:48 PM Edit   Reply   Quote Quick Reply   Recently I made two aperture down-stoppers with cardboard for my 5 inch refractor. One results in 100mm and the other results in 80mm. On porrima, I found it can be resolved by 100mm with barely a dark space, very hard to be seen but I guess the dark line should be seen under better seeing. With the 80mm, it is just two closely attached balls without any space. Post Extras:       Pages: 1

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