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HD 201156


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CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory (2nd series)
We present the measurements of 65 visual double stars made in 1998 withthe 50 cm refractor of the Nice Observatory (Table 1). A CCD camera wasattached to this refractor. 6 new binaries discovered by Hipparcos havebeen measured. The algorithm used for these measurements is based on theadjustment of a tridimensional mathematical surface. Table 1 is alsoavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

Observation of binary stars and calculation of their orbits
The observation and orbital determination of binary systems arediscussed, and ephemerides for 19 binaries are presented. Factorsaffecting binary star observation include the separation, the relativemagnitude of the two stars, and the limitations of the instrumentemployed. Limiting magnitudes of 8.5 for a telescope aperture of 0.12 m,9.5-10 for an aperture of 0.20 m, and 11-12 for an aperture of 0.50 mare indicated. It is suggested that binary orbits can only be accuratelydetermined based on data obtained for a sufficiently large arc of thecompanion's orbit, and that the observed arc should include theapastron.

Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

Micrometer Observations of Double Stars and New Pairs - Part Ten
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ApJS...44..111H&db_key=AST

Comparison of proper motions obtained by means of rectilinear trajectories of optical double stars with those given by the SAO catalog
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1979A&A....71...55D&db_key=AST

Photographic measures of double stars. II
Measures are presented for 302 double stars photographed on 657 plateswith the 36-in. Lick refractor in the period between 1945 and 1962. Thedata provided include the observing epochs, the rectangular coordinatesof the secondary components with reference to the respective primaries,the mean errors of a single measurement, the computed mean errors, thedouble-star separations, and the position angles both for the observingepoch and reduced to the equator of 2000. An additional 561 unmeasuredplates of acceptable quality obtained between 1948 and 1960 are listed.

Positions moyennes et mouvements propres de 355 etoiles DU GC de la zone de declinaison +33 +36.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976A&AS...26..219M&db_key=AST

Double star measures at Lick Observatory Mount Hamilton California.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976PASP...88..325H&db_key=AST

Mesures d'étoiles doubles faites à l'équatorial de 38 CM de l'Observatoire de Paris
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&AS....6..147B&db_key=AST

Mesures d'étoiles doubles visuelles
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....3...71M&db_key=AST

Mesures d'étoiles doubles à Meudon (2^éme série)
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Mesures d'etoiles doubles faites AU 38cm de l'Observatoire de Paris.
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Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Mesures d'étoiles doubles faites au 0,38 m de l'Observatoire de Paris.
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Micrometer measures of doubles stars. III.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963AJ.....68...57V&db_key=AST

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
Not Available

Micrometer measures of double stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67..141V&db_key=AST

Mesures d'étoiles doubles faites aux Observatoires Yerkes et McDonald
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Note sur le mouvement du couple optique ADS 14 645 = Σ 2 760
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Mesures d'étoiles doubles faites au rĝfraceur de 38 cm de l'Observatoire de Nice
Not Available

Mesures d'étoiles doubles
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Micrometer Measures of Double Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1959ApJS....4...45V&db_key=AST

Mesures d'étoiles doubles faites à l'Observatoire de Paris
Not Available

Mesures d'étoiles doubles faites au réfracteur de 30 cm. de l'Observatoire de Neuchatel
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Mesures d'étoiles doubles faites à Strasbourg en 1954
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Mesures d'étoiles doubles faites à Strasbourg en 1952-1953
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Mesures d'étoiles doubles faites à l'Observatoire de Paris
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Mesures d'Etoiles Doubles faites à Strasbourg en 1951
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Mesures d'Etoiles Doubles faites à l'Observatoire de Paris (suite)
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Observation and Astrometry data

Constellation:Schwan
Right ascension:21h06m46.77s
Declination:+34°07'56.1"
Apparent magnitude:7.874
Distance:147.71 parsecs
Proper motion RA:-0.9
Proper motion Dec:-29.1
B-T magnitude:8.132
V-T magnitude:7.896

Catalogs and designations:
Proper Names
HD 1989HD 201156
TYCHO-2 2000TYC 2709-1318-1
USNO-A2.0USNO-A2 1200-17104722
HIPHIP 104210

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