Page "Transient lunar phenomenon" Paragraph 15

* In 1992, Audouin Dollfus of the Observatoire de Paris reported anomalous features on the floor of Langrenus crater using a one-meter ( 3. 2-foot ) telescope.

While observations on the night of December 29, 1992, were normal, unusually high albedo and polarization features were recorded the following night that did not change in appearance over the six minutes of data collection.

Observations three days later showed a similar, but smaller, anomaly in the same vicinity.

While the viewing conditions for this region were close to specular, it was argued that the amplitude of the observations were not consistent with a specular reflection of sunlight.

The favored hypothesis was that this was the consequence of light scattering from clouds of airborne particles resulting from a release of gas.

The fractured floor of this crater was cited as a possible source of the gas.