Condensation on Dewar window




Telescope MDM 1.3m
Date 9/29/95
Instrument Nellie
Filter V
Exposure
Time		 600
sec

Problem:

This bright filamentary structure is caused by condensation forming on the dewar window at high relative humidity (>40%). Starlight is refracted by the water on the dewar window.

Fix:

Fix is observatory dependent

Example 2

Example 3

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