Binary Star Measurements with a 17th Century, Long-Focal, Non-Achromatic Refractor

Details Binary Star Measurements with a 17th Century, Long-Focal, Non-Achromatic Refractor Binary Star Measurements with a 17th Century, Long-Focal, Non-Achromatic Refractor

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jdso....6..280b&link_type=abstract

Journal of Double Star Observations, vol. 6, no. 4, p. 280-292.

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of the evaluation of my long-focal, non-achromatic refractor of the type developed during the first century, i.e., the 17th century, of optical astronomy, I have observed 175 double and multiple stars. After having observed most of these binary stars visually, I decided to see if it would be possible to measure their position angles and separations. Thus, I built a micrometer and began a program to determine if - and how accurately - I could measure the characteristics of these binaries. To my great surprise, the average error of the measured position angles is only 2 degrees and that of the separations is only 1 arc-second - values that are almost a good as modern measurements. These results further indicate that these very early and relatively primitive telescopes were much better that modern astronomical historians believe.

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