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HD 207496

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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.
The ROSAT all-sky survey catalogue of the nearby stars We present X-ray data for all entries of the Third Catalogue of NearbyStars \cite[(Gliese & Jahreiss 1991)]{gli91} that have been detectedas X-ray sources in the ROSAT all-sky survey. The catalogue contains1252 entries yielding an average detection rate of 32.9 percent. Inaddition to count rates, source detection parameters, hardness ratios,and X-ray fluxes we also list X-ray luminosities derived from Hipparcosparallaxes. Catalogue also available at CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
The Palomar/MSU Nearby Star Spectroscopic Survey.II.The Southern M Dwarfs and Investigation of Magnetic Activity Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....112.2799H&db_key=AST
Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1994RMxAA..28...43P&db_key=AST
Preliminary Version of the Third Catalogue of Nearby Stars Not Available
UBV Photometry of 500 Southern Stars [erratum: 1973MNSSA..32...48C] Not Available
Dwarf K and M stars in the southern hemisphere. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972AJ.....77..486U&db_key=AST

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观测天体数据

星座:	南極座
右阿森松:	21^h54^m51.31^s
赤纬:	-77Â°20'16.8"
视星:	8.29
距离:	26.378 天文距离
右阿森松适当运动:	228.9
赤纬适当运动:	-188.7
B-T magnitude:	9.592
V-T magnitude:	8.398

目录:

适当名称
HD 1989	HD 207496
TYCHO-2 2000	TYC 9478-418-1
USNO-A2.0	USNO-A2 0075-06873336
HIP	HIP 108162

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