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HD 99510


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Hipparcos astrometry for 257 stars using Tycho-2 data
We present improved Hipparcos astrometry for 257 Hipparcos stars,resolved into 342 components. For 64 of the stars no astrometry wasobtained in the Hipparcos Catalogue, while for the remaining starsadditional components have been added by this solution or the positionshave been revised considerably. We have used the published Hipparcostransit data for the new solutions, together with results from thesecond reduction of the Tycho data for defining better initial values.Based on observations made with the ESA Hipparcos astrometry satellite.Table 3 is only available in electronic form at the CDS via anonymousftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

VRI photometry of wide double stars with A- type primaries.
We are presenting VRI photometry of 93 wide visual double stars havinglate B- or A- type primaries, taken from the Annex of Double andMultiple Stars of the HIPPARCOS Input Catalogue. Spectral types havebeen estimated for most of the primaries and for the majority of thesecondaries. 40% of them probably have common origin components, forwhich we calculated photometric parallaxes and some orbital valuesestimates.

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Osservazione e dati astrometrici

Costellazione:Centauro
Ascensione retta:11h26m31.80s
Declinazione:-55°28'35.6"
Magnitudine apparente:9.145
Moto proprio RA:-10.9
Moto proprio Dec:6.2
B-T magnitude:9.253
V-T magnitude:9.154

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 99510
TYCHO-2 2000TYC 8621-1606-1
USNO-A2.0USNO-A2 0300-12730500
HIPHIP 55829

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