Space Studies of the Black-Drop Effect at a Mercury Transit

Details Space Studies of the Black-Drop Effect at a Mercury Transit Space Studies of the Black-Drop Effect at a Mercury Transit

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13...70s&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The accuracy with which the Astronomical Unit was known has been historically limited by the ""black drop"" effect observed during Venus's rare transits. It is often mistakenly attributed to Venus's atmosphere. We report on observations taken outside the Earth's atmosphere of the 1999 and 2003 transits of Mercury with the NASA solar satellite known as the Transition Region and Coronal Explorer (TRACE). Though there was no contribution from the atmosphere of Mercury or the Earth nevertheless a faint black-drop effect was detected. We discuss and model the images showing the sources of the black-drop effect. The techniques we discuss are applicable to ground-based and space-based observations of the 8 June 2004 and 5-6 June 2012 transits of Venus.

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