Table 3: Our observations of $\alpha$ Psc that employ an astrometric calibration derived from images of the Trapezium cluster core, compared to the prediction of the ephemerides from Scardia (1983). The mean residuals were used as a correction for the ephemerides. In this way the measurements of Gliese 22 before 1995 were put into a consistent system of pixel scale and detector orientation.
Epoch Telescope Instrument Measured Predicted Residuals

(calibrated with Trapezium) (Scardia 1983)

PA [deg] d [arcsec] PA [deg] d [arcsec] $\Delta$ PA $\Delta d$

1995.526 ESO NTT SHARP II 275.8 $\pm$ 0.1 1.848 $\pm$ 0.005 276.5 1.868 -0.7 -0.020

1996.641 ESO 3.6-m ADONIS 274.5 $\pm$ 0.1 1.870 $\pm$ 0.008 275.8 1.861 -1.3 0.009

1997.8843 CA 3.5-m MAGIC 274.8 $\pm$ 0.2 1.838 $\pm$ 0.012 275.0 1.853 -0.2 -0.015

1999.6681 CA 3.5-m OMEGA Cass 273.1 $\pm$ 0.1 1.852 $\pm$ 0.004 273.8 1.842 -0.7 0.010

mean residuals -0.7 $\pm$ 0.2 -0.004 $\pm$ 0.008

**Table 3:** Our observations of $\alpha$ Psc that employ an astrometric calibration derived from images of the Trapezium cluster core, compared to the prediction of the ephemerides from Scardia (1983). The mean residuals were used as a correction for the ephemerides. In this way the measurements of Gliese 22 before 1995 were put into a consistent system of pixel scale and detector orientation.
Epoch	Telescope	Instrument	Measured	Predicted	Residuals
			(calibrated with Trapezium)	(Scardia 1983)
			PA [deg]	d [arcsec]	PA [deg]	d [arcsec]	$\Delta$ PA	$\Delta d$
1995.526	ESO NTT	SHARP II	275.8 $\pm$ 0.1	1.848 $\pm$ 0.005	276.5	1.868	-0.7	-0.020
1996.641	ESO 3.6-m	ADONIS	274.5 $\pm$ 0.1	1.870 $\pm$ 0.008	275.8	1.861	-1.3	0.009
1997.8843	CA 3.5-m	MAGIC	274.8 $\pm$ 0.2	1.838 $\pm$ 0.012	275.0	1.853	-0.2	-0.015
1999.6681	CA 3.5-m	OMEGA Cass	273.1 $\pm$ 0.1	1.852 $\pm$ 0.004	273.8	1.842	-0.7	0.010
						mean residuals	-0.7 $\pm$ 0.2	-0.004 $\pm$ 0.008

Source LaTeX | All tables | In the text