tms48 Posted May 14, 2011 Share Posted May 14, 2011 To give an idea of how difficult it is to split double stars what would be the minimumsize reflector and magnification size needed to split castor on an average seeing night. Link to comment Share on other sites More sharing options...
NGC 1502 Posted May 14, 2011 Share Posted May 14, 2011 I can recall splitting Castor easily with a Tal 1 110mm reflector at 80x,and my old Vixen 60mm refractor did the same, no problem.I have the Cambridge Double Star Atlas. With that, I'm unlikely to runout of new objects to find.Best regards, Ed. Link to comment Share on other sites More sharing options...
John Posted May 14, 2011 Share Posted May 14, 2011 At the moment the separation is around 4 arc seconds so a 60mm at around 80x should be enough I would have thought. Link to comment Share on other sites More sharing options...
Ags Posted May 14, 2011 Share Posted May 14, 2011 A good challenge at the moment would be porrima next to saturn - a split of 1.7 arc seconds. I can get a clear split with my 102mm mak. Link to comment Share on other sites More sharing options...
philhas Posted May 14, 2011 Share Posted May 14, 2011 I wish I could split these clouds! Link to comment Share on other sites More sharing options...
Paulb3098 Posted May 15, 2011 Share Posted May 15, 2011 Hi,Dawes Limit gives the following values for resolution:Aperture (mm): 50, 60, 75, 100, 125, 150, 200, 250, 300Closest stars (arsec) : 2.3, 1.9, 1.5, 1.2, 0.9, 0.8, 0.6, 0.5, 0.4The formula is R = 11.6/DD in centimetres, R in arcsecondsObviously this is only theoretical and doesn’t take into consideration the viewing conditions.Hope it goes some way to answering your question.Paul Link to comment Share on other sites More sharing options...
Donkeiller Posted May 15, 2011 Share Posted May 15, 2011 Castor is easy in my ED80 Link to comment Share on other sites More sharing options...
banner001 Posted May 15, 2011 Share Posted May 15, 2011 tms48under 'in space' conditions = 30mm appertureaverage seeing = 60mmremember that even with a massive apperture bad seeing conditions will stop you from seeing anything. Link to comment Share on other sites More sharing options...
John Posted May 15, 2011 Share Posted May 15, 2011 tms48under 'in space' conditions = 30cm appertureaverage seeing = 60cmremember that even with a massive apperture bad seeing conditions will stop you from seeing anything.Should the aperture measurement be in mm here Link to comment Share on other sites More sharing options...
tms48 Posted May 15, 2011 Author Share Posted May 15, 2011 Thanks all that gives me a basis to work on Link to comment Share on other sites More sharing options...
banner001 Posted May 16, 2011 Share Posted May 16, 2011 Should the aperture measurement be in mm here but it is in mm.... Link to comment Share on other sites More sharing options...
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