Discussion of trignometric parallaxes determined along right ascension and declination

Details Discussion of trignometric parallaxes determined along right ascension and declination Discussion of trignometric parallaxes determined along right ascension and declination

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cha%26a..11..269z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 11, Issue 4, p. 269-274.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We discuss the data of trignometric parallaxes determined along α and δ published by the US Naval Observatory and Van Vleck Observatory. We found that the absolute difference δπ = πx-πy shows a very similar periodic variation with α for both observations. This variation is shown to be due to errors in πy and to be related to the current practice of maximising the parallax factor for parallax determination in right ascension. Therefore, if possible, we should increase observations where the parallax factor in declination is maximised.

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