Exoplanet count

Over at PlanetQuest (maintained by the Jet Propulsion Laboratory) the current planet count is standing at 204 following the recent announcement of four more gas-giant planets around the stars HD 219828, HD 100777, HD 190647 and HD 221287 all of which are between 170 and 260 light years away. However, that number disagrees with my preferred planet counter; the fantastic Extrasolar Planets Encyclopaedia (EPE) maintained by Jean Schneider of Paris Observatory. That is currently reporting a total of 218 candidate planets (as of 7th April 2007). One of the cool features of the EPE is that, as well as giving you the low-down on each new candidate, it splits them up by detection method. So, for instance, you can see that an amazing 206 of the 218 candidate planets have been found using the radial velocity method.
Of course planets are all very well and good but sometimes I want to know how many moons various solar system bodies have. For those answers I use Scott Sheppard's excellent satellite count page. Saturn is up to 56 moons now and with Cassini still spotting them, it may exceed Jupiter's 63 known moons!

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Posted in astro blog by Stuart on Sunday 08th Apr 2007 (16:43 BST) | Permalink
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