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Star magnitudes. I have been including references to mags in my reports for while. What I do is make an estimate myself then compare to the chart to get a clearer idea. I am starting to get reasonable at usually within 2 mags of figure on chart, usually estimate under. I find sometimes I like to spend a few minutes with a well known field, say Orion, Scorpius or Sag and cruise around practicing mag estimates, comparing fainter stars to known brighter stars and checking agianst the charts, should do it more often though. Also having a look at a few doubles helps with getting a feel for magnitudes.
Malcolm
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