European Astronomers Discover 32 exoplanets.
On October 19, it was announced that 30 new planets were discovered, all were detected by radial velocity method.
It is the most planets ever announced in a single day during the exoplanet era. October 2009 now holds the most planets discovered in a month, breaking the record set in June 2002 and August 2009, during which 17 planets were discovered.
An extrasolar planet, or exoplanet, is a planet beyond our solar system, orbiting a star other than our Sun. As of 8 December 2009 (2009 -12-08)[update], 406 exoplanets are listed in the Extrasolar Planets Encyclopaedia. The vast majority have been detected through radial velocity observations and other indirect methods rather than actual imaging. Most of the discovered exoplanets are massive gas giant planets thought to resemble Jupiter, however this is believed to be an effect of sampling bias because gas giants are easier to detect with current technology. Projections based on recent detections of much smaller worlds suggest that lightweight, rocky planets will eventually be found to outnumber extrasolar gas giants.
PSR B1257+12B is an extrasolar planet (approximately 980 light-years away) in the constellation of Virgo (the Virgin). PSR B1257+12B was the first planet ever discovered outside the Solar system, and is the second object known to be orbiting the pulsar PSR B1257+12. At a distance of 0.36 AU with an orbital period of approximately 66 days. The planet is over four times as large as the Earth. Because planet B and planet C have very similar masses (as well as orbiting close to each other), they cause measurable perturbations in each other's orbits. As expected, perturbations were detected confirming that the planets are real. Accurate masses of the two planets, as well as their inclinations, were measured by calculating how much the planets interfere with each other.