55 Cancri e , also known as Janssen , orbits a star
DISCOVERED 2004
PLANET TYPE: Super Earth
55 Cancri e , also known as Janssen , orbits a star called Copernicus only 41 light years away.
The molten surface is completely uninhabitable, but above the burning horizon, Janssen’s sister planet, Galileo, hangs in a dark sky. Silicates in the atmosphere would condense into clouds on the tidally-locked planet’s darkside reflecting the lava below. So, the skies would sparkle.
55 Cancri e , also known as Janssen , orbits a star
55 Cancri e is a super-Earth exoplanet that orbits a G-type star similar to our Sun. Its mass is 8.08 Earths, it takes 0.7 days to complete one orbit of its star, and is 0.01544 AU from its star. Its discovery was announced in 2004.
A) ORBITAL RADIUS 0.01544AU
B) ORBITAL PERIOD 0.7 days
C) ORBITAL ECCENTRICITY 0.05
Planet Comparison 55 Cancri eEarth MASS7.99 Earths RADIUS1.875 x Earth
Star Comparison 55_CncOur Sun MASS0.91 x Our Sun RADIUS0.94 x Our Sun
How long to Travel Here from Earth?
TRAVEL SPEED 60 Miles per hour
TRAVEL TIME 459 Million years
Detection Method: Radial Velocity
The radial velocity method measures slight changes in a star’s velocity as the star and the planet move about their common center of mass. Astronomers can detect these variances by analyzing the spectrum of starlight. In an effect known as Doppler shift, light waves from a star moving toward us are shifted toward the blue end of the spectrum. If the star is moving away, the light waves shift toward the red end of the spectrum. This happens because the waves become compressed when the star is approaching the observer and spread out when the star is receding. The effect is similar to the change in pitch we hear in a train’s whistle as it approaches and passes.
Observed By:
McDonald Observatory
Source: Exoplanets Nasa Gov exoplanet catalog
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Super Earth K2 18 B is a Super Earth exoplanet
55 Cancri e, also known as Janssen, orbits a star. 55 Cancri e, also known as Janssen, orbits a star called Copernicus only 41 light years away. The molten surface is completely uninhabitable, but above the burning horizon, Janssen’s sister planet, Galileo, hangs in a dark sky. So, the skies would sparkle. 55 Cancri e, also known as Janssen, orbits a star. This happens because the waves become compressed when the star is approaching the observer and spread out when the star is receding.
