Principal     Comenzar     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astrofotografía     La Colección     Foro     Blog New!     FAQ     Prensa     Login  

HD 143255


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

Statistical Constraints for Astrometric Binaries with Nonlinear Motion
Useful constraints on the orbits and mass ratios of astrometric binariesin the Hipparcos catalog are derived from the measured proper motiondifferences of Hipparcos and Tycho-2 (Δμ), accelerations ofproper motions (μ˙), and second derivatives of proper motions(μ̈). It is shown how, in some cases, statistical bounds can beestimated for the masses of the secondary components. Two catalogs ofastrometric binaries are generated, one of binaries with significantproper motion differences and the other of binaries with significantaccelerations of their proper motions. Mathematical relations betweenthe astrometric observables Δμ, μ˙, and μ̈ andthe orbital elements are derived in the appendices. We find a remarkabledifference between the distribution of spectral types of stars withlarge accelerations but small proper motion differences and that ofstars with large proper motion differences but insignificantaccelerations. The spectral type distribution for the former sample ofbinaries is the same as the general distribution of all stars in theHipparcos catalog, whereas the latter sample is clearly dominated bysolar-type stars, with an obvious dearth of blue stars. We point outthat the latter set includes mostly binaries with long periods (longerthan about 6 yr).

Enviar un nuevo artículo


Enlaces relacionados

  • - No se han encontrado enlaces -
En viar un nuevo enlace


Miembro de los siguientes grupos:


Datos observacionales y astrométricos

Constelación:Corona Boreal
Ascensión Recta:15h58m21.12s
Declinación:+29°34'31.1"
Magnitud Aparente:9.376
Movimiento Propio en Ascensión Recta:7.4
Movimiento Propio en Declinación:5.4
B-T magnitude:10.879
V-T magnitude:9.501

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 143255
TYCHO-2 2000TYC 2040-1266-1
USNO-A2.0USNO-A2 1125-07451991
HIPHIP 78218

→ Solicitar más catálogos y designaciones a VizieR