Poчetna     Да почнемо     To Survive in the Universe    
Inhabited Sky
    News@Sky     Астро Фотографије     Колекција     Форум     Blog New!     FAQ(Често постављана питања     Штампа     Улогуј се  

HD 181581


Садржај

Слике

Уплоадјуј своје слике

DSS Images   Other Images


Везани чланци

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).

The Coronal Spectrum of the July 20, 1963 Eclipse
Not Available

Додај нови чланак


Линкови у сродству са темом

  • - Нема линкова -
Додај нови линк


Чланови следећих група \:


Посматрања и Астрометриски подаци

Сазвежђа:Стрелац
Ректацензија:19h21m53.54s
Deклинација:-21°38'39.3"
Apparent магнитуда:8.603
Даљина:130.378 parsecs
Proper motion RA:57
Proper motion Dec:-5.4
B-T magnitude:9.065
V-T magnitude:8.642

Каталог и designations:
Proper имена   (Edit)
HD 1989HD 181581
TYCHO-2 2000TYC 6309-2318-1
USNO-A2.0USNO-A2 0675-32787878
HIPHIP 95193

→ Захтевај још каталога од VizieR