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A&G February 2005 Vol. 46 1.7 The"blackdrop"phenomenon
 

Summary: NEWS
A&G February 2005 Vol. 46 1.7
The"blackdrop"phenomenon
observedduringplanetarytran-
sitscouldhavethesameexplana-
tionasasimilareffectseenon
Saturn,sayMEBailey,DStewart
andMStronge.
Recent transits of Mercury (15 Nov-
ember 19 9 9 ) and V enus (8 June 2004 )
have led to new interest in the origin
and ex planation of the famous " black
drop" phenomenon (e.g. Schaefer
2001, Schneider, P asachoff and
Golub 2004 , Sheehan and W estfall
2004 , and references therein).
It appears that the effect is an
optical phenomenon produced by
convolution of the instrumental
point-spread function, including

  

Source: Armagh Observatory

 

Collections: Physics