PSR B1257+12 B

extrasolar planet

PSR B1257+12 B is an extrasolar planet in the constellation of Virgo. It is around 980 light years away from Earth. It was the first planet ever discovered outside of the Solar System.[1] It is over four times bigger than Earth. It orbits the pulsar PSR B1257+12, going around it approximately every 66 days at a distance of 0.36 AU.[2]

Size comparison of PSR B1257+12 B with Earth and Neptune.


  1. Konacki, M., Wolszczan, A. (2003). "Masses and Orbital Inclinations of Planets in the PSR B1257+12 System". The Astrophysical Journal. 591 (2): L147–L150. arXiv:astro-ph/0305536. Bibcode:2003ApJ...591L.147K. doi:10.1086/377093.CS1 maint: multiple names: authors list (link)
  2. Wolszczan, A., Frail, D. (1992). "A planetary system around the millisecond pulsar PSR1257 + 12". Nature 355 (6356): 145–147. Bibcode:1992Natur.355..145W. doi:10.1038/355145a0.

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