Possible TLP seen with 4 inch Cooke by T G E Elger
TLP’s or Transient Lunar Phenomenon are bright patches which can be seen on the surface of the Moon. They are caused by gas escaping through cracks on the surface of the Moon. The term Transient Lunar Phenomenon seems to have been first used by the TV astronomer Patrick Moore.
On the 9th April 1867 TGE Elger from Bedford using a Thomas Cooke and Sons of York 4 inch telescope was waiting for the occultation by the Moon of the star 150 Tauri when a bright spot as bright as a 7th magnitude star appeared in the crater Aristarchus.
The spot was seen from 7h 30 min to about 8h and 15 min and it became much fainter. At 9h it was scarcely visible through the 4 inch telescope. Elger used powers of 75 and 115 on his Cooke telescope.
Could this be another example of an early observation of a TLP?