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HD 25228


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Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

Photoelectric UBV sequences in Tau.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1967AJ.....72.1012L&db_key=AST

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Osservazione e dati astrometrici

Costellazione:Toro
Ascensione retta:04h01m25.91s
Declinazione:+28°30'06.8"
Magnitudine apparente:7.073
Distanza:149.031 parsec
Moto proprio RA:29.9
Moto proprio Dec:-32.5
B-T magnitude:7.268
V-T magnitude:7.09

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 25228
TYCHO-2 2000TYC 1825-856-1
USNO-A2.0USNO-A2 1125-01405832
HIPHIP 18781

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