I'm interested in taking measurements of double stars, and I have a question for you more experienced folks. I was looking up 19 Lyn, and Burnham's Celestial Handbook gives values of 14.7" of separation and a PA of 315 deg. The
Night Sky Observers Guide gives values of 14.8" and 315 deg.
My question is regarding the value in the Washington Double Star Catalogue. I find these data:
07229+5517STF1062AB 1782 2019 92 317 317 14.2 13.8 5.76 6.71 B8V+B9V -004-032 -008-036 +55 1192 NZW 072252.06+551653.3
If I have looked up the info correctly, the last observation was in 2019 and the separation is 13.8" and the PA 317 deg. Is this value the most up to date? Not much difference between the observations from 1782 and 2019; but compared to the literature references there is enough of a difference to give me pause.
I also found an old S & T online article that lists 19 lyn as a double star that can be used for calibration, and the results are similar to the literature.