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HD 252904

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Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue. We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
Photoelectric observations of lunar occultations Photoelectric observations of 13 lunar occultation disappearances duringa March 1979 Hyades passage are reported. Three double stars (SAO 93925= Fin 342 = 70 Tau, SAO 93961 = ADS 3248, and SAO 95419 = Kui 24) andone possible double (SAO 93950 = 75 Tau) were detected. A briefdescription is given of the Purdue University pulse-counting photometeras modified for occultation observations.
Photoelectric observations of lunar occultations. X Photoelectric occulation results for 461 events observed during 15months are reported. They include 77 reappearances, 4 determinations ofangular diameter, 38 analyses of double or multiple stars including twopreviously unknown bright stars, and 8 previously known bright double ormultiple stars.
Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance. Not Available
La mesure des vitesses radiales au prisme objectif. VII - 2e liste de vitesses radiales déterminées au prisme objectif à vision directe Not Available

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Osservazione e dati astrometrici

Costellazione:	Orione
Ascensione retta:	06^h11^m06.72^s
Declinazione:	+18Â°10'59.1"
Magnitudine apparente:	8.881
Moto proprio RA:	-0.3
Moto proprio Dec:	-6.8
B-T magnitude:	8.812
V-T magnitude:	8.876

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 252904
TYCHO-2 2000	TYC 1318-851-1
USNO-A2.0	USNO-A2 1050-03152880

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