PSR B1257+12 D

PSR B1257+12 D

Extrasolar Planet
name = PSR B1257+12D
semimajor = ~2.6
period_year = ~3.5
ang_dist = 8.665
mass_earth = 0.0004
discovery_date = 2002
discovery_site = Poland
discovery_method = Pulsar Timing
discoverers = A. Wolszczan

PSR B1257+12D is a possible extrasolar planet approximately 980 light-years away in the constellation of Virgo. It is suspected that an asteroid or comet is orbiting PSR B1257+12 at an average orbital distance of 2.6 AU with an orbital period of approximately 3.5 years.

Originally, in 1996, a possible Saturn-like (100 Earth mass) gas giant was announced orbiting the pulsar at a distance of about 40 AU. However, the discovery was not conclusive and was later retracted. It is now thought that the signal came from an asteroidal or cometary body

The object is so small that it is not even considered to be a planet, but it is the first known extrasolar asteroid or comet akin to the objects in the Kuiper belt in our solar system. It is possible that this object is the largest member of a belt of minor objects around the pulsar.

External links

* http://www.extrasolar.net/planettour.asp?StarCatId=pulsar&PlanetId=238


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