T0	Period [s]	Reference
45576	437.483 +0.004 -0.004	Makishima et al. (1984)
45850	437.649 +0.019 -0.019	Cook & Page (1987)
48156.6	439.16 +0.02 -0.02	in't Zand et al. (1998)
50134	440.341 +0.014 -0.014	in't Zand et al. (1998)
50440.4	440.4877 +0.0085 -0.0085	Baykal et al. (2001)
51021.9	440.7045 +0.0032 -0.0032	Baykal et al. (2001)
51080.9	440.7598 +0.0010 -0.0010	Baykal et al. (2001)

T0	Pdot	Reference
	+0.225 s/yr	in't Zand et al. (1998)

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This pulsar has been in a monotonous spin-down mode since its discovery in 1983. Four periods measured in 1983, 1984, 1990 and 1996 are equal to within 8 percent to a value of pdot = +0.225 s/yr from 1983 until 1994 in't Zand et al. (1998) Fritz et al. (2006) found a torque reversal with a new spin-up value of pdot= -0.147 s/yr since MJD53022

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Last modification date: Fri Aug 3 01:06:14 2007