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TYC 2102-409-1


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CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars
Context: We measured the angular separations, position angles, ΔV, Δ y and Δ I of wide visual double stars during the period2003-2005. At least one component of the double stars in our sample hasan entry in the Hipparcos catalogue. Aims: Our measurements are acontribution to the study of the nature of these double stars. Methods: The northern double stars of the project were observed with the1.2 m telescope of the Kryonerion observatory and the southern with the1.0 m SAAO. We performed multiple-exposure CCD imaging of our targetsand used the standard procedure of data reduction and astrometric CCDcalibrations. Results: We present measurements of 213 northern and 219southern wide binaries.Based on observations made at Kryonerion Observatory of the NationalObservatory of Athens, Greece, and the South African AstronomicalObservatory. Full Table 1 and Tables 2, 3 are only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/472/1055

Photographic astrometry of binary and proper-motion stars. III
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987AJ.....94.1077H&db_key=AST

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Observation and Astrometry data

Constellation:Ηρακλής
Right ascension:17h56m43.98s
Declination:+29°29'14.2"
Apparent magnitude:10.249
Proper motion RA:20.4
Proper motion Dec:0.9
B-T magnitude:10.767
V-T magnitude:10.292

Catalogs and designations:
Proper Names   (Edit)
TYCHO-2 2000TYC 2102-409-1
USNO-A2.0USNO-A2 1125-08767346
HIPHIP 87842

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