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===55 Cancri A===

===55 Cancri A===

'''55 Cancri A''' is a yellow-orange main sequence dwarf of spectral type G8 V and is the primary star of the system that all known extrasolar worlds in that system orbit.  55 Cancri A has around 95 percent of the Sun's mass, 1.1 times its diameter, but is only around 60 percent as luminous.<ref>http://exoplanets.org/55cnc5th.pdf</ref> The star [[metallicity]] is twice (204 percent) as much as our Sun's, based on its abundance of iron.<ref>http://www.iop.org/EJ/article/0004-637X/581/2/1375/56220.html</ref>  Much like our sun, the star appears to be middle aged at around 5 billion years.<ref>http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...443..609S&db_key=AST&nosetcookie=1</ref>

'''55 Cancri A''' is a yellow-orange main sequence dwarf of spectral type G8 V and is the primary star of the system that all known extrasolar worlds in that system orbit.  55 Cancri A has around 95 percent of the Sun's mass, 1.1 times its diameter, but is only around 60 percent as luminous.<ref>http://exoplanets.org/55cnc5th.pdf</ref> The star [[metallicity]] is twice (204 percent) as much as our Sun's, based on its abundance of iron.<ref>http://www.iop.org/EJ/article/0004-637X/581/2/1375/56220.html</ref> The star is chromospherically inactive and has a rotational period of 39 days. Much like our sun, the star appears to be middle aged at around 5 billion years.<ref>http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...443..609S&db_key=AST&nosetcookie=1</ref>

 

In 1998 a dust disk was confirmed around 55 Cancri A that may be similar in composition to the Kuiper Belt.  The dust orbits the star from 27 AU to more than 44 AU out, with an orbital inclination of 25^o from our line of sight.<ref>http://aas.org/archives/BAAS/v30n3/dps98/222.htm?q=publications/baas/v30n3/dps98/222.htm</ref>

===55 Cancri B===

===55 Cancri B===