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The original Hipparcos data from 1997 listed Bellatrix as lying 243.04 [[light year]]s from [[Earth]].<ref name=universeguide/> However the more recent 2007 release suggests it is slightly further away at 252.45 light years. The star is fairly large, with a mass 8-9 that of the [[Sun]] and a radius 3.18 times greater. Being larger, it emits around 6,400 times as much energy as the Sun.<ref name=constellation-guide/>
The original Hipparcos data from 1997 listed Bellatrix as lying 243.04 [[light year]]s from [[Earth]].<ref name=universeguide/> However the more recent 2007 release suggests it is slightly further away at 252.45 light years. The star is fairly large, with a mass 8-9 that of the [[Sun]] and a radius 3.18 times greater. Being larger, it emits around 6,400 times as much energy as the Sun.<ref name=constellation-guide/>
On July 11, 2005 the occultation of Bellatrix by [[Enceladus]] (one of [[Saturn]]'s many moons) was used to investigate Enceladus' atmosphere.<ref name=atmosphere2>"[http://photojournal.jpl.nasa.gov/catalog/PIA03552 Enceladus Atmosphere Not Global]." [[Jet Propulsion Laboratory|JPL]], [[National Aeronautics and Space Administration|NASA]], August 30, 2005. Accessed June 17, 2008.</ref> It revealed the atmosphere is not global in scope, but is probably local to the south polar region, where most of the venting takes place.
==References==
==References==