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Statistical Constraints for Astrometric Binaries with Nonlinear Motion
Useful constraints on the orbits and mass ratios of astrometric binariesin the Hipparcos catalog are derived from the measured proper motiondifferences of Hipparcos and Tycho-2 (Δμ), accelerations ofproper motions (μ˙), and second derivatives of proper motions(μ̈). It is shown how, in some cases, statistical bounds can beestimated for the masses of the secondary components. Two catalogs ofastrometric binaries are generated, one of binaries with significantproper motion differences and the other of binaries with significantaccelerations of their proper motions. Mathematical relations betweenthe astrometric observables Δμ, μ˙, and μ̈ andthe orbital elements are derived in the appendices. We find a remarkabledifference between the distribution of spectral types of stars withlarge accelerations but small proper motion differences and that ofstars with large proper motion differences but insignificantaccelerations. The spectral type distribution for the former sample ofbinaries is the same as the general distribution of all stars in theHipparcos catalog, whereas the latter sample is clearly dominated bysolar-type stars, with an obvious dearth of blue stars. We point outthat the latter set includes mostly binaries with long periods (longerthan about 6 yr).

Photoelectric Photometry of Stars in the Orion Standard Region
Magnitudes and color indices in the Vilnius seven-color photometricsystem are given for 108 stars in the Orion standard region around theOrion Belt and the star lambda Orionis. New spectral and luminosityclasses, estimated from the photometric data, are given for some of thestars.

Errata in Magnitudes of Stars in AGK3
Not Available

Radial Velocities of 713 Stars in Four Fields of 4DEG by 4DEG - Measurements by the 620-MM Objective Prism of the Observatoire de Haute-Provence
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981A&AS...43..297F&db_key=AST

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Dades d'Observació i Astrometria

Constel·lació:Pisces
Ascensió Recta:01h11m06.54s
Declinació:+32°31'04.2"
Magnitud Aparent:7.876
Distancia:174.825 parsecs
Moviment propi RA:21.5
Moviment propi Dec:7.3
B-T magnitude:9.153
V-T magnitude:7.982

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 7033
TYCHO-2 2000TYC 2282-1138-1
USNO-A2.0USNO-A2 1200-00490269
HIPHIP 5543

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