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HD 21982


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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

ICCD Speckle Observations of Binary Stars. XIII. Measurements During 1989- 1994 From the Cerro Tololo 4 M Telescope
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..936H&db_key=AST

ICCD speckle observations of binary stars. VIII - Measurements during 1989-1991 from the Cerro Tololo 4 M telescope
One-thousand eighty-eight observations of 947 binary star systems,observed by means of speckle interferometry with the 4 m telescope onCerro Tololo, are presented. These measurements, made during the period1989-1991, comprise the second installment of results stemming from theexpansion of our speckle program to the southern hemisphere.

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Membre dels grups següents:

Dades d'Observació i Astrometria

Constel·lació:Horologium
Ascensió Recta:03h29m55.11s
Declinació:-55°54'01.2"
Magnitud Aparent:9.101
Distancia:189.036 parsecs
Moviment propi RA:9.4
Moviment propi Dec:7.8
B-T magnitude:9.561
V-T magnitude:9.139

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 21982
TYCHO-2 2000TYC 8496-1235-1
USNO-A2.0USNO-A2 0300-01031664
HIPHIP 16284
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