Exoplanet Discoveries, discussion of the latest finds |
Exoplanet Discoveries, discussion of the latest finds |
Guest_PhilCo126_* |
Apr 21 2009, 11:10 AM
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Guests |
Well-known exoplanet researcher Dr Michel Mayor ( discoverer of Peg 51b with Dr Didier Queloz in 1995 ) today announced the discovery of the lightest exoplanet found so far. The planet, “e”, in the famous system Gliese 581, is only about twice the mass of our Earth. The team also refined the orbit of the planet Gliese 581 d, first discovered in 2007, placing it well within the habitable zone, where liquid water oceans could exist:
http://www.eso.org/public/outreach/press-r...9/pr-15-09.html |
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Feb 23 2017, 08:27 PM
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
If I am reading the Simbad entry correct for Trappist 1
http://simbad.u-strasbg.fr/simbad/sim-id?I...3062928-0502285 then it has a high proper motion with a -471 mas change in declination per year. I am handwaving the difference between the ecliptic and the celestial equator because I can. Given fredk's numbers of 38-15 = 23 arc minutes away from ecliptic, or 1380 arc seconds. 1380/.471 ~= 3000 years So TRAPPIST-1 will be able to observe Earth transits a few thousand years from now. The rest of the planets are inclined > 3/4* to the ecliptic, so unless they just happened to cross near TRAPPIST-1, they won't cause transits. -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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