YBP 1194

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YBP 1194 is a G5V star in the open cluster M67 in the constellation Cancer.[1][2] It is the best solar twin found to date, having the same temperature, mass, and chemical abundances as our sun. On December 19th 2013, it was announced to have an extrasolar planet with a period of 6.9 days, an eccentricity of 0.24 and a mass of 0.34 MJ.[3] Two more planets were later discovered.[2]


It was discovered in January 2014 by researchers at the European Southern Observatory (ESO) that three new planets were discovered in the M67 cluster, two of them orbiting YPB 1194, showing that open star clusters are more likely to have planets orbiting them then originally thought.[2][4] The composition of these planets is as yet unknown.[2]


  1. ^ "Cl* NGC 2682 YBP 1194". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 4 March 2014. 
  2. ^ a b c d David Dickinson (January 15, 2014). "New exoplanet discoveries in open star cluster". Postmedia News. Retrieved March 4, 2014. 
  3. ^ Brucalassi, A.; Pasquini, L.;Saglia, R.; et. al (2014). "Three planetary companions around M 67 stars". Astronomy & Astrophysics 561: L9. arXiv:1401.4905. Bibcode:2014A&A...561L...9B. doi:10.1051/0004-6361/201322584. 
  4. ^ "Rare Planet Discovered Orbiting Twin of Earth’s Sun in Star Cluster". January 15, 2014. Retrieved March 4, 2014.