Proposed Discovery
A team of astronomers led by Stéphane Udry of the Geneva Observatory used the HARPS instrument on the European Southern Observatory 3.6 meter telescope in La Silla, Chile to discover the planet in 2007. Udry's team employed the radial velocity technique, in which the mass of a planet is determined based on the small perturbations it induces in its parent star’s orbit via gravity.
In September 2012, Roman Baluev filtered out the "red noise" from the Keck data and concluded that this planet's existence is probable only to 2.2 standard deviations.
Read more about this topic: Gliese 581 D
Famous quotes containing the words proposed and/or discovery:
“He [Roosevelt] has made some speeches that indicate that he is going quite beyond anything that he advocated when he was in the White House, and has proposed a program which is absolutely impossible to carry out except by a revision of the Constitution.”
—William Howard Taft (1857–1930)
“There is a great discovery still to be made in literature, that of paying literary men by the quantity they do not write.”
—Thomas Carlyle (1795–1881)