Artist's impression of HD 40307g and two of its sibling planets closer in. Illustration courtesy J. Pinfield, for the RoPACS network at the University of Hertfordshire
HD 40307 is a Solar-like star, but somewhat dimmer, known to have 5 other planets. This, its sixth planet, is still undergoing confirmation tests, but seems at this point a virtual shoe-in for the catalog of extrasolar worlds.
With a mass of at least 7 times that of Earth, if its density is similar to that of Earth, then its surface gravity will be significantly higher.
What is significant about this discovery is that the planet is securely embedded in the system's habitable zone. This is where liquid water is possible, if the planet has a modest atmosphere, like that of Earth.
Name: HD 40307
Apparent Magnitude: 7.17
Distance: 41.73 light years (12.8 parsecs)
RA: 5h 54m 4.0s
DE: -60° 1' 24"
Spectral Type: K2.5 V
Mass: 0.77 ☉
Radius: ? ☉
Temperature: 4,977 °K
Planet: HD 40307g
Mass: 0.0223 MJ (7.085 MEarth)
Radii: ? RJ (? REarth)
Semi-major Axis: 0.6 AU
Orbital Period: 197.8 days
Effective Temperature: ?
http://exoplanet.eu/catalog/hd_40307_g/, retrieved 2012:1119.
http://news.yahoo.com/super-earth-alien-planet-may-habitable-life-000948317.html, retrieved 2012:1109
http://www.space.com/18390-super-earth-exoplanet-habitable-zone-infographic.html, retrieved 2012:1109
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