Nomenclature PSR B1257+12 C

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the convention arose designating pulsars of using letters psr (pulsating source of radio) followed pulsar s right ascension , degrees of declination. modern convention prefixes older numbers b meaning coordinates 1950.0 epoch. new pulsars have j indicating 2000.0 coordinates , have declination including minutes. pulsars discovered before 1993 tend retain b names rather use j names, pulsars have j name provides more precise coordinates of location in sky.


on discovery, planet designated psr 1257+12 c , later psr b1257+12 c. discovered before convention extrasolar planets receive designations consisting of star s name followed lower-case roman letters starting b established. however, listed under latter convention on astronomical databases such simbad , extrasolar planets encyclopedia. hence alternative designation psr b1257+12 d.








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