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HD 193328


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A False Planet around HD 192263
We present new high-precision Strömgren photometry and Ca II H andK spectrophotometry of HD 192263. Based on radial velocity variationsdetected previously by two groups, this K2 V star was thought to host a0.75 MJup (minimum mass) planetary companion in a 24 dayorbit. Our photometric observations reveal periodic variations thatmatch the purported planetary orbital period, while the Ca II H and Kemission fluxes are modulated on half the planetary period. Thissuggests that rotational modulation of the visibility of stellar surfaceactivity is the source of the observed radial velocity variations.Therefore, HD 192263 should be removed from lists of stars withwell-established planetary companions unless further observations andanalysis can support the existence of the planet in spite of the star'sintrinsic variations.

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Observation and Astrometry data

Constellation:Aquila
Right ascension:20h19m47.46s
Declination:-00°54'25.7"
Apparent magnitude:7.464
Distance:141.643 parsecs
Proper motion RA:-9
Proper motion Dec:-20.5
B-T magnitude:7.618
V-T magnitude:7.477

Catalogs and designations:
Proper Names
HD 1989HD 193328
TYCHO-2 2000TYC 5162-1474-1
USNO-A2.0USNO-A2 0825-18095682
HIPHIP 100237

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