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HD 160940


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Open clusters with Hipparcos. I. Mean astrometric parameters
New memberships, mean parallaxes and proper motions of all 9 openclusters closer than 300 pc (except the Hyades) and 9rich clusters between 300 and 500 pc have been computed using Hipparcosdata. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to0.5 mas/yr for proper motions, are of great interest for calibratingphotometric parallaxes as well as for kinematical studies. Carefulinvestigations of possible biases have been performed and no evidence ofsignificant systematic errors on the mean cluster parallaxes has beenfound. The distances and proper motions of 32 more distant clusters,which may be used statistically, are also indicated. Based onobservations made with the ESA Hipparcos astrometry satellite

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

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Dades d'Observació i Astrometria

Constel·lació:Scorpius
Ascensió Recta:17h44m15.15s
Declinació:-34°46'16.5"
Magnitud Aparent:7.994
Distancia:341.297 parsecs
Moviment propi RA:-1.1
Moviment propi Dec:-2.2
B-T magnitude:8.945
V-T magnitude:8.073

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 160940
TYCHO-2 2000TYC 7385-1045-1
USNO-A2.0USNO-A2 0525-29192296
HIPHIP 86802

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