Celestron 8SE XLT Celestron 6SE + Antares f/0.63 focal reducer Celestron SE Goto Mount Kson 1026 ED Carbon Fibre tube Skywatcher Synscan AZ Goto Various EPs (Baader Mk III Zooom, BST, Televue, X-Cel LX)
I want to do more then just look.
Quote:With my 10" refl at 74x all three stars of Mizar appear bluish white.Rich (RLTYS)
Clear Skies, TonyScopes: Celestron 150mm SCT, ES 102mm refractor, 114mm Newt, Circle T 80mm refractor, Cel./Vix. 60mm refractor "the Brute" EP's: Various and sundry along with barlows WO and ES Dielectric Diagonals Filters: DGM Optics NPB, Orion SkyGlow Filter, color and longpass AstroZap Dew Shield, Vibration Pads etc... AstroPlanner V2.1, SkySafari 4 Plus, Vortex 8X42, 60's 7X35 Binocs Astronomy in the Orange Zone! ...73 de KM5JH...
Quote:What is your experience about smallest telescope to split Izar and Porrima,please?
I ache, therefore I am
Quote:What's the current separation of Porrima?
Quote:I don't remember where but I remember reading that one of our great ancestors,Reverend Webb maybe,was able to split Izar in a 1.5 inch aperture telescope.I'm very positive about splitting Porrima in my very small reflectors of 72mm F/11 and 76mm F/9.But about Izar,I had a couple of times the impression I split it in the 76mm F/9 reflector but still not sure.What is your experience about smallest telescope to split Izar and Porrima,please?ziridava
Used acronyms: NEML=Naked Eye Magnitude Limit, SQM=Sky Quality Meter, TML=Telescope Magnitude Limit, CO=Central Obstruction, delta_m=difference in magnitudes between double star components, RoT=Rule of Thumb, pD_mm=proposed D_mm for resolving a binary (ident with earlier used pA=proposed Aperture), D_mm=Diameter (of scope) in mm, UCAC4=USNO CCD Astrograph Catalog 4th edition
Quote:I thought it was a reference to a galileo scope, such as I've seen some folk experimenting with - rather than a single-lens eyepiece. William Herschel used such single-element eyepieces at times, though that's rare in post-Huyghens observing. Ok, so it's an eyepiece. I shall simply express myself puzzled about combining a later type of telescope with a primitive eyepiece. Which I think is why I misread the note. Question suggested by my earlier ramble - what's the smallest aperture that anyone's seen Izar split with? We know that 60mm does it, and Buffham with ~48mm. The latter (1.875" aperture, unobstructed) has a Dawes Limit of ~2.4", which suggests it might be near the best possible. Of course, "resolved" as we've often discussed here can mean anything from separated by a black space to vaguely elongated. Any offers of splits need to spell that out.
Quote:I don't think it's optically good enough to manage Izar at 50mm
Quote:So the light is playing trick to our eyes. it's an optical illusion or visual phenomenon?Thank you for explaining