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HD 121557


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Improved Mean Positions and Proper Motions for the 995 FK4 Sup Stars not Included in the FK5 Extension
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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

Close visual binaries. I - MK classifications
Each component of 170 close visual binaries has been classified with newprocedures for controlling contamination problems. These classificationsare presented and are shown to be on the MK system. Two sources of areascanner UBV photometry were compared in order to establish homogeneousphotometric as well as spectroscopic data. From a consideration ofsystematic errors in the V magnitude difference (Delta V) betweencomponents the photometry of Hurly and Warner (1983) is to be preferred.Absolute magnitudes for each binary are derived from Delta V via atested MK - M(v) map.

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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983MNRAS.202..761H&db_key=AST

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Observation and Astrometry data

Constellation:Compas
Right ascension:13h58m31.20s
Declination:-65°48'02.0"
Apparent magnitude:6.2
Distance:161.812 parsecs
Proper motion RA:-34.7
Proper motion Dec:-50.4
B-T magnitude:7.605
V-T magnitude:6.357

Catalogs and designations:
Proper Names
HD 1989HD 121557
TYCHO-2 2000TYC 9016-1992-1
USNO-A2.0USNO-A2 0225-18744351
BSC 1991HR 5242
HIPHIP 68270
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