Tag Archives: Hastings-Byrne

How Did Hastings Design Our Objective? Part Two

by John Church Objectives for smaller telescopes are sometimes designed to conform to the “Herschel condition” proposed by John Herschel in two papers in the early 1820’s.  These objectives perform well at nearby distances as well as on celestial objects … Continue reading

Posted in March 2021, Sidereal Times | Tagged , | Leave a comment

Hastings Byrne Refractor – Focuser Re-Fitment

by Tom Swords On one of the last public evenings in October in 2017, I was at the Observatory with Jen and Dave Skitt to observe some double stars after we had closed. Dave and I noted that the focuser … Continue reading

Posted in March 2018, Sidereal Times | Tagged , | Leave a comment

Hastings-Byrne Refractor Update

by Dave Skitt AAAP member Tom Swords, in consultation with John Church and with my assistance, is currently working to improve the connection of the focuser for the Hastings-Byrne refractor to the tube assembly. We have become aware that the … Continue reading

Posted in January 2018, Sidereal Times | Tagged , | Leave a comment

Telescope Longevity

by John Church Our historic 6¼-inch Hastings-Byrne refractor, with its objective lens dating from 1879, was ready for the morning of May 9th and the transit of Mercury. We comfortably followed and photographed the transit with a 55-mm Plossl eyepiece … Continue reading

Posted in June 2016, Sidereal Times | Tagged , | Leave a comment

Testing the Hastings-Byrne Refractor

by John Church Since some members had reported seeing a decline in the optical performance of the 6-1/4 inch Hastings-Byrne refractor, I conducted a thorough test of it on the night of April 18. Dave and Jen Skitt and Gene … Continue reading

Posted in May 2015, Sidereal Times | Tagged , | Leave a comment