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HD 142304


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A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

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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Osservazione e dati astrometrici

Costellazione:Regolo
Ascensione retta:15h55m43.09s
Declinazione:-44°31'56.7"
Magnitudine apparente:6.822
Distanza:383.142 parsec
Moto proprio RA:-3.5
Moto proprio Dec:-14.5
B-T magnitude:6.819
V-T magnitude:6.822

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 142304
TYCHO-2 2000TYC 7850-1611-1
USNO-A2.0USNO-A2 0450-22467600
HIPHIP 78004

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