Table 1: Parameters of Geminga and PSR B0656+14 (from Taylor et al. 1993, unless specified otherwise).
  Geminga B0656+14
Observed
$\alpha$ (J2000)a... $6^{\rm h}33^{\rm m}54\hbox{$.\!\!^{\rm s}$ }1530(28)^b$ $6^{\rm h}59^{\rm m}48\hbox{$.\!\!^{\rm s}$ }1472(7)^c$
$\delta$ (J2000)a... $17\hbox{$^\circ$ }46^{\prime}12\hbox{$.\!\!^{\prime\prime}$ }909(40)^b$ $14\hbox{$^\circ$ }14^{\prime}21\hbox{$.\!\!^{\prime\prime}$ }160(10)^c$
$\mu_\alpha^a$ (mas yr-1). 138(4)d 45.47(65)c
$\mu_\delta^a$ (mas yr-1). 97(4)d -2.40(29)c
$\pi^a$ (mas)...... 6.36(1.74)d 3.47(36)c
le.......... 195 $.\!\!^\circ$134 201 $.\!\!^\circ$108
be.......... 4 $.\!\!^\circ$265 8 $.\!\!^\circ$258
P (ms)........ 237 385
${\dot P}$ (10-15)..... 10.97 55.01
$D\!M^f$ (cm-3 pc) 2.9g 14.02
Derived
da (pc)...... 157(+59-34)d 288(+33-27)c
$\tau^h$ (kyr)..... 342 111
$\log B$ (G).... 12.21 12.67
$\log \dot E$ (erg s-1) 34.57 34.58
a Coordinates, proper motion, parallax, and parallax-based distance; hereafter the numerals in parentheses are 1$\sigma $ uncertainties referring to last significant digits quoted; b Caraveo et al. (1998) (epoch 1995.21); c Brisken et al. (2003); d Caraveo et al. (1996); e galactic coordinates; f dispersion measure; g  Malofeev & Malov (1997); h characteristic age $P/2\dot{P}$.

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