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Petrichor: The smell after rainfall
) a measure of the distance,
, of a celestial object too far away to show measurable parallax. It is given by
= 5 log(
is its apparent magnitude (corrected for interstellar absorption) and
is its absolute magnitude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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