HD 101057

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Mean positions and proper motions of 305 stars obtained from the combination of PZT observations at Ondrejov with AGK positions
Observations of 305 stars carried out at the Ondrejov Observatory in theperiod 1973-1983 were compared to the positions of the same stars in theAGK 2 and AGK 3 catalogs in order to obtain their mean positions andproper motions. The observations were performed in the course of 1140nights using the PZT telescope and comprise more than 32 thousand startransits. The average mean errors in the right ascension and declinationof a star that was observed thoughout the whole period were + or -0.0019 s and + or - 0.019 arcsec in the epoch around 1979. It ispredicted that the errors will increase + or - 0.0055 sec and + or -0.059 arcsec in the year 2000. A table listing the errors in the rightascension and declination is provided.

The determination of mean positions and proper motions of 304 stars from PZT observations at Ondrejov
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Dades d'Observació i Astrometria

Constel·lació:	Ursa Major
Ascensió Recta:	11^h38^m05.13^s
Declinació:	+49Â°37'39.0"
Magnitud Aparent:	8.835
Distancia:	83.333 parsecs
Moviment propi RA:	-92.8
Moviment propi Dec:	2.9
B-T magnitude:	9.546
V-T magnitude:	8.894

Catàlegs i designacions:

Noms Propis	(Edit)
HD 1989	HD 101057
TYCHO-2 2000	TYC 3454-1989-1
USNO-A2.0	USNO-A2 1350-07978499
HIP	HIP 56749

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