Download スライド 1 - Celestron

Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Over 20 light-years away,
Earth-like planets?
Credit: ESO
Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Location
R.A.: 15h19m26s
Dec: -07d43’20”
Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Image ca. 20 arc minutes wide. Credit: DSS
Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Credit: ESO
Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Credit: ESO
Cover Page
Star Chart
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Orbits
Cover Page
Star Chart
System Data
Photograph
Radial Velocity
Habitable Zone
Orbits
System Data
Planetary Life?
Further Info
Star cataloged as Gliese 581
Constellation:
Spectrum:
Age vs Sun:
Distance:
Magnitude:
Sun masses:
Sun radii:
Sun luminosity:
Temperature:
Sun magnitude:
Libra
M3
nearly 2x
20.4 ly
10.6 mv
0.31
0.38
0.00202
3,250oK
3.81 mv
1AU = 149.598 mio km (93.5 mio miles)
b Earth masses:
Distance:
Period:
Eccentricity:
15.65
0.04AU
5.37 d
0
c Earth masses:
Distance:
Period:
Eccentricity:
5.36
0.07AU
12.93 d
0.17
d Earth masses:
Distance:
Period:
Eccentricity:
7.09
0.22AU
66.8 d
0.38
e Earth masses:
Distance:
Period:
Eccentricity:
1.94
0.03AU
3.15 d
0
Cover Page
Star Chart
Is Life out there on ‘c’ and ‘d’?
Photograph
Radial Velocity
Pros:
Habitable Zone
• Super-Earth-class size
Orbits
System Data
• Situated in Gliese 581’s HZ
Planetary Life?
• Existence of liquid water possible
Further Info
• Grainy or ocean covered surface
Cons:
• Radiation impact from the star
• Probably tidally locked
Credit: ESO
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.
Cover Page
Star Chart
Further information:
Photograph
Radial Velocity
Habitable Zone
Orbits
The Crowded Universe by Alan Boss on Fora TV
http://fora.tv/2009/03/13/Alan_Boss_The_Crowded_Universe
System Data
Planetary Life?
The Extrasolar Planet Encyclopaedia
Further Info
http://exoplanet.eu
Planetquest
http://planetquest.jpl.nasa.gov
The Kepler Mission
http://kepler.nasa.gov