Weltevreden Farm 13 kms west of Nieu-Bethesda , South Africa. Equipment is a Celestron C6, Intes MN61 & MK66, Santel 180 F/10, and Bosma Mak 200mm f/12.
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:...the problem with using diff rings when citing seeing conditions in an observing report is that the brightness and width of the rings differ by aperture and individual scope optical quality. Additionally, the air column gets more turbulent as aperture goes up and exit pupil goes down, so tolerable seeing in a 80mm can be just awful in a 200mm...
WO Megrez 90, Vixen Sphinx Deluxe + NexSXD, Nikon D7100, ZWO ASI120MM StelleDoppie - Double Star Database