PSR B1257+12 b

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**PSR B1257+12 b**
Parent star
Extrasolar planet		List of extrasolar planets
Star		PSR B1257+12
Constellation		Virgo
Right ascension	(α)	13^h 00^m 01^s
Declination	(δ)	+12° 40′ 57″
Distance		980 ly (300 pc)
Spectral type		Pulsar
Orbital elements
Semimajor axis	(a)	0.19 AU
Eccentricity	(e)	0.00
Orbital period	(P)	25.262 ± 0.003 d
Angular distance	(θ)	0.633 mas
Longitude of periastron	(ω)	0°
Time of periastron	(T₀)	2,449,765.6 ± 0.2 JD
Semi-amplitude	(K)	? m/s
Physical characteristics
Mass	(m)	7e-05 M_J (0.025 M_⊕)
Discovery information
Discovery date		23 September 1994
Discoverer(s)		Aleksander Wolszczan
Detection method		Pulsar Timing
Discovery site		Poland
Discovery status		Published

PSR B1257+12 b, previously called PSR B1257+12 A, is the innermost planet orbiting the pulsar at a distance of 0.19 AU with an orbital period of approximately 25 days. In 1997, it was claimed that this planet was in fact an artifact caused by solar wind, but this claim has since been disproved. It is about twice as massive as Earth's Moon.