Home     Baþlangýç     Evrende yaþayabilmek için    
Inhabited Sky
    News@Sky     Gökyüzü görüntüsü     Koleksiyon     Forum     Blog New!     SSS     Basýn     Giriþ  

TYC 3367-1292-1


Ýçindekiler

Görüntüler

Resim Yükleyin

DSS Images   Other Images


Ýlgili Makaleler

Corrections to the Hipparcos Proper Motions in Declination for 807 Stars
We used the data on latitude variations obtained from observations with10 classical photographic zenith tubes (PZT) in order to improve theHipparcos proper motions in declinations ?_{?} for 807 stars.Part of observing programmes, carried out during the last century forthe purpose of studying the Earth's rotation, were realized by using PZTinstruments. These observations were performed within in the intervals(tens of years) much longer than that of the Hipparcos mission (lessthan 4 years). In addition, the annual number of observations for everyPZT-programme star is several hundreds on the average. Though theaccuracy of the star coordinates in the Hipparcos Catalogue is by twoorders of magnitude better than that of the star coordinates from thePZT observations, the large number of observations performed a muchlonger time interval makes it possible to correct the Hipparcos propermotions and to improve their accuracy with respect to the accuracy givenin the Hipparcos Catalogue. Long term examinations of latitude and timevariations were used to form the Earth Orientation Catalogue (EOC-2),aimed at a more accurate determination of positions and proper motionsfor the stars included. Our method of calculating the corrections of theproper motions in declination from the latitude variations is differentfrom the method used in obtaining the EOC-2 Catalogue. Comparing theresults we have established a good agreement between our ?_{?}and the EOC-2 ones for the star sample used in the present paper.

Mean positions and proper motions of 224 stars based on PZT observations at Ondrejov in 1973-1986
An improvement of the positions and proper motions for the Ondrejov PZTstar list based on observations of 224 stars in the period 1973-1986 ispresented. The mean epoch of the PZT 86 catalogue is found to be 1981.56with a standard error in right ascension equal to + or - 0.0015 s/ andin delination equal to + or - 0.017 arcsec. The proper motions in rightascension and declination were obtained with an accuracy characterizedby the average standard errors of + or - 0.051 s/cy and + or - 0.57arcsec/cy, respectively. The PZT 86 catalogue is compared with theprevious PZT (1978 and 1983) catalogues, and with the AGK 3 (Dieckvoss,1975) catalogue.

The determination of mean positions and proper motions of 304 stars from PZT observations at Ondrejov
Not Available

Yeni bir Makale Öner


Ýlgili Baðlantýlar

  • - Baðlantý Bulunamadý -
Yeni Bir Baðlantý Öner


sonraki gruplarýn üyesi:


Gözlemler ve gökölçümü verileri

Takýmyýldýz:Arabaci
Sað Açýklýk:05h30m49.63s
Yükselim:+49°47'12.8"
Görünürdeki Parlaklýk:10.091
özdevim Sað Açýklýk:-6.6
özdevim Yükselim:-16.8
B-T magnitude:10.594
V-T magnitude:10.133

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
TYCHO-2 2000TYC 3367-1292-1
USNO-A2.0USNO-A2 1350-05876886
HIPHIP 25821

→ VizieR 'den daha fazla katalog ve tanýmlama isteyin