over 20 light-years away, earth-like planets?
DESCRIPTION
Over 20 light-years away, Earth-like planets?. Credit: ESO. Location R.A.: 15h19m26s Dec: -07d43’20”. Image ca. 20 arc minutes wide. Credit: DSS. Credit: ESO. Credit: ESO. Orbits. b. Earth masses:15.65 Distance:0.04AU Period:5.37 d Eccentricity:0. System Data. - PowerPoint PPT PresentationTRANSCRIPT
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Over 20 light-years away,Earth-like planets?
Credit: ESO
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
LocationR.A.: 15h19m26sDec: -07d43’20”
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Image ca. 20 arc minutes wide. Credit: DSS
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Credit: ESO
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Credit: ESO
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Orbits
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Constellation: LibraSpectrum: M3Age vs Sun: nearly 2xDistance: 20.4 lyMagnitude: 10.6 mvSun masses: 0.31Sun radii: 0.38Sun luminosity: 0.00202Temperature: 3,250oKSun magnitude: 3.81 mv
Earth masses: 15.65Distance: 0.04AUPeriod: 5.37 dEccentricity: 0
Earth masses: 5.36Distance: 0.07AUPeriod: 12.93 dEccentricity: 0.17
Earth masses: 7.09Distance: 0.22AUPeriod: 66.8 dEccentricity: 0.38
b
c
d
Star cataloged as Gliese 581
1AU = 149.598 mio km (93.5 mio miles)
System Data
Earth masses: 1.94Distance: 0.03AUPeriod: 3.15 dEccentricity: 0
e
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Is Life out there on ‘c’ and ‘d’?Pros:• Super-Earth-class size• Situated in Gliese 581’s HZ• Existence of liquid water possible• Grainy or ocean covered surface
Cons:• Radiation impact from the star• Probably tidally locked
Anyway:The system is “only” 20.4 light-years away and therefore a travel target for the future by when
our successors will know more about this planetary system, which may count more than
the four planets known to date. Suppose it would be possible to travel near the speed
of light, the journey would take about 6.1 years one-way at 1g acceleration.
Credit: ESO
Cover PageStar ChartPhotographRadial VelocityHabitable ZoneOrbitsSystem DataPlanetary Life?Further Info
Further information:
The Crowded Universe by Alan Boss on Fora TV
http://fora.tv/2009/03/13/Alan_Boss_The_Crowded_Universe
The Extrasolar Planet Encyclopaedia
http://exoplanet.eu
Planetquest
http://planetquest.jpl.nasa.gov
The Kepler Mission
http://kepler.nasa.gov