Kepler Mission |
Kepler Mission |
Sep 24 2005, 04:23 PM
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#1
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Member Group: Members Posts: 147 Joined: 3-July 04 From: Chicago, IL Member No.: 91 |
This NASA Discovery mission is to be launched in June 2008 and will search for Earth-size and smaller planets. Launch was originally scheduled in 2007 but delayed by 8 months due to "funding constraints".
Here's the official web site: http://www.kepler.arc.nasa.gov/ |
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Guest_PhilCo126_* |
Mar 12 2009, 08:58 AM
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#2
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Guests |
Correct Doug... examining the star's (periodic) radial velocity(ies) reveals the mass(es) of exo-planet(s).
AdyG --> http://en.wikipedia.org/wiki/HAT-P-2b Multiple exo-planets: |
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Mar 12 2009, 11:23 AM
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#3
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Member Group: Members Posts: 128 Joined: 10-December 06 From: Atlanta Member No.: 1472 |
Correct Doug... examining the star's (periodic) radial velocity(ies) reveals the mass(es) of exo-planet(s). Using radial velocity technique, one can calculate m.sin(i), where m is the mass and i the orbital inclination (for one or more planets). Hence, the radial velocity only determines a lower limit on the mass. If an exoplanet is observed by both radial velocity and transit method, it means i=90 (due to seeing a transit), and that fixed the mass. Planet radius can be calculated by transit method. Therefore, using a combination of radial velocity and transit methods, it is possible to calculate the density (but neither does it alone). |
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