Monday, 9 November 2020

Occultation of Delta 3 Tauri seen from Liverpool and a Cooke


Occulation of Delta 3 Tauri from Liverpool with 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. This happened in 1977 when Uranus passed in front of a star leading to the discovery of its system of rings.

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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