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HD 209856


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Apsidal Motion and Photometric Elements of the Eccentric Eclipsing Binary V401 Lacertae
New (UBV) photometric observations of the recently discovered eccentricorbit binary V401 Lacertae were analyzed by using the Wilson-Devinneyprogram. Seven new minimum times were estimated by using newobservations. The analysis of the light curves and all available minimumtimes has revealed that the system is detached, with the orbitaleccentricity e = 0.1734 ± 0.0003, the longitude of the periastronω = 63.°93 ± 0.°15, the rate of change of thelongitude of periastron dot{ω} = 0.°0200 ± 0.°0024cycle-1, corresponding to an apsidal motion period of U =96.2 ± 11.4 yr. The apsidal motion of the system has beenconfirmed by the significant difference on the longitude of periastron(ω) obtained from two light curves (Hipparcos and ourselves) intwo different epochs.

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Observation and Astrometry data

Constellation:Eidechse
Right ascension:22h05m13.07s
Declination:+49°18'45.5"
Apparent magnitude:8.247
Distance:254.453 parsecs
Proper motion RA:0.2
Proper motion Dec:-14.9
B-T magnitude:8.409
V-T magnitude:8.261

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 209856
TYCHO-2 2000TYC 3613-1887-1
USNO-A2.0USNO-A2 1350-15761687
HIPHIP 109026

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