55 Cancri e, also carrying the official designation 55 Cancri Ae and the proper name Janssen, is an exoplanet orbiting the Sun-like star 55 Cancri A. It has about eight times Earth's mass and roughly twice Earth's diameter, and it was discovered in data gathered between 2003 and 2004, announced in 2004, making it the first super-Earth found orbiting a main-sequence star. It is the innermost known planet in its system, completing an orbit in under 18 hours, a period that later observations in 2010 corrected downward from an earlier estimate of about 2.8 days.
Facts
Orbital Distance Discovery Year In the Other Atlases
In Constellation
Also in Divinity Atlas: the constellation this subject lies in.
Source 55 Cancri (Wikipedia)Lead paragraphQuote, Lead paragraph
55 Cancri is a binary star system located 41 light-years away from the Sun in the zodiac constellation of Cancer.
Sources
1. Wikipedia (space and spaceflight articles)
Wikimedia Foundation
2. 55 Cancri Ae
Introduction
making it the first super-Earth discovered around a main sequence star
Infobox, semimajor
0.01596151 ? 0.00000011 AU
Introduction [discovery-year]
was discovered in data taken during 2003-2004 and announced in 2004
Introduction [alias-also-known-as]
officially named Janssen
55 Cancri e, Wikipedia - lead section, catalogue classification
55 Cancri Ae (abbreviated 55 Cnc Ae), officially named Janssen (), is an exoplanet orbiting a Sun-like host star, 55 Cancri A.
In Group: Rocky and Habitable-Zone Exoplanets, Lead sentence
55 Cancri Ae was discovered in data taken during 2003-2004 and announced in 2004, thus making it the first super-Earth discovered around a main sequence star, predating Gliese 876 d by a year.
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