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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

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

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Dades d'Observació i Astrometria

Constel·lació:Orion
Ascensió Recta:05h19m42.24s
Declinació:-04°52'38.3"
Magnitud Aparent:7.347
Distancia:179.856 parsecs
Moviment propi RA:-12.7
Moviment propi Dec:-6.5
B-T magnitude:7.531
V-T magnitude:7.363

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 34774
TYCHO-2 2000TYC 4760-248-1
USNO-A2.0USNO-A2 0825-01435383
HIPHIP 24857

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