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HD 234679


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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.

Mean positions and proper motions of 305 stars obtained from the combination of PZT observations at Ondrejov with AGK positions
Observations of 305 stars carried out at the Ondrejov Observatory in theperiod 1973-1983 were compared to the positions of the same stars in theAGK 2 and AGK 3 catalogs in order to obtain their mean positions andproper motions. The observations were performed in the course of 1140nights using the PZT telescope and comprise more than 32 thousand startransits. The average mean errors in the right ascension and declinationof a star that was observed thoughout the whole period were + or -0.0019 s and + or - 0.019 arcsec in the epoch around 1979. It ispredicted that the errors will increase + or - 0.0055 sec and + or -0.059 arcsec in the year 2000. A table listing the errors in the rightascension and declination is provided.

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

Detectability and nature of CNO anomalies in early-type main-sequence stars.
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&A....30..395B

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Takýmyýldýz:Ejderha
Sað Açýklýk:18h34m27.74s
Yükselim:+49°57'04.2"
Görünürdeki Parlaklýk:8.554
Uzaklýk:1098.901 parsek
özdevim Sað Açýklýk:-6.1
özdevim Yükselim:-9.2
B-T magnitude:10.361
V-T magnitude:8.704

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 234679
TYCHO-2 2000TYC 3535-845-1
USNO-A2.0USNO-A2 1350-09763434
HIPHIP 91055
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