55 Cancri e
Graphic: Nasa
Most known planets: 55 Cancri
A double system of a sunlike orange-yellow Star, which has at least five planets, and a red dwarf.
Further outside around 55 Cancri A is a widespread dust disk.
The planets:
55 Cancri e: 0.045 times mass of Jupiter, 0.038 AU distance, 2.81 days orbit period, very hot.
55 Cancri b: 0.84 times mass of Jupiter, 0.155 AU distance, 14.76 days orbit period, about 700 kelvin hot.
55 Cancri c: 0.21 times mass of Jupiter, 0.24 AU distance, 44.3 days orbit period, excentrical orbit.
55 Cancri f: 0.14 times mass of Jupiter, 0.785 AU distance, 260.8 days orbit period, lies in the habitable zone.
55 Cancri d: 4.1 times mass of Jupiter, 5.9 AU distance, 14.7 years orbit period.
Constellation: Cancer
Age: 5 billion years
Distance: 40.9 light-years
Radial velocity: 27.2 km/sec
Space between 55 Cancri A and B: 1065 AU
55 Cancri A
Spectral class: G8
Visual magnitude: 5.95
Luminosity: 0.57 * Sun
Mass: 0.85 * Sun
Diameter: 0.91 * Sun
55 Cancri B
Spectral class: M3.5
Visual magnitude: 13.14
Luminosity: 0.00076 * Sun
Mass: 0.13 * Sun
Diameter: 0.3 * Sun
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