Wednesday 13 October 2021

John Joynson, Liverpool, delta 3 Tau and a Cooke


On November 9th 1870 John Joynson of Waterloo in Liverpool observed an occultation of delta 3 Tauri. Delta 3 is one of the members of the Hyades cluster of stars that are near to Aldebaran in Taurus. Joynson was using a 6 inch Cooke telescope.

An occultation occurs when the Moon passes in front of a star blocking out the light from the star. Very occasionally a planet will pass in front of a star. 

According to Joynson the Moon passed over this star and the disappearance took place at 11 hours, 19 minutes and 11.3 seconds. The star reappeared at 12 hours 16 minutes and 50.7 seconds. The observations were considered very satisfactory.

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