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HD 166099


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UBV photometry and period variations of V 839 Ophiuchi
A complete period variation analysis and new light curves of V~839 Ophtogether with new ephemeris data are presented. The period variation wasfound to be dP/dt=3.1x10^{-7} d/yr. The period increment indicates thatthe conservative mass transfer rate from the less massive component tothe more massive one is 6.5x10^{-7} M_{\sun}/yr. We fitted parabolic andwe discuss the possible detection of sinusoidal curves to the (O-C)diagram and sinusoidal oscillations with period of about 20 yr andsemi-amplitude of 0.0065 day. A simultaneous solution of the B and Vlight curves was computed using the Wilson-Devinney syntheticlight-curve code. The light curve solution indicates that the A-type WUMa-type system is in contact with a filling factor of ~39%. Table 2 andTable 5 only available in electronic form: see the Editorial in A&AS1994, Vol. 103, No. 1.

Period Changes in V839 Ophiuchi
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Photoelectric Observations and Minima Times of Four W UMa Systems: LS Del, SW Lac, V839 Oph and AQ Psc
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An Observed Minimum of V 839 Ophiuchi
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Osservazione e dati astrometrici

Costellazione:Ofiuco
Ascensione retta:18h08m50.70s
Declinazione:+09°04'16.7"
Magnitudine apparente:9.292
Moto proprio RA:-3.9
Moto proprio Dec:16.4
B-T magnitude:9.857
V-T magnitude:9.339

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 166099
TYCHO-2 2000TYC 1009-464-1
USNO-A2.0USNO-A2 0975-10573638
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