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HD 197954

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New periodic variables from the Hipparcos epoch photometry Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.
Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1985A&AS...59...15A&db_key=AST
Final catalogue of 229 photometric standards in UBV system near the selected areas 1-115 Not Available
Photoelectric radial velocities. V. 69 southern HR stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.155..449G&db_key=AST
The corrected magnitudes and colours of 278 stars near S.A. 1-139 in the UBV system Not Available

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Osservazione e dati astrometrici

Costellazione:	Acquario
Ascensione retta:	20^h47^m03.60^s
Declinazione:	-02Â°29'12.0"
Magnitudine apparente:	6.27
Distanza:	241.546 parsec
Moto proprio RA:	-20.1
Moto proprio Dec:	-20.8
B-T magnitude:	8.358
V-T magnitude:	6.452

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 197954
TYCHO-2 2000	TYC 5182-2292-1
USNO-A2.0	USNO-A2 0825-18705397
BSC 1991	HR 7946
HIP	HIP 102561

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