Solar diameter observations at Observatório Nacional in 1997-1998

Details Solar diameter observations at Observatório Nacional in 1997-1998 Solar diameter observations at Observatório Nacional in 1997-1998

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..135..227j&link_type=abstract

Astronomy and Astrophysics Supplement, v.135, p.227-229

Astronomy and Astrophysics

Astrophysics

17

Sun: General, Fundamental Parameter

Scientific paper

In January 1997, at the Observatório Nacional (ON), Rio de Janeiro, Brazil, CCD observations of the solar diameter with a Danjon astrolabe equipped with a variable angle reflecting prism began. This prism is operated manually and enables to observe the Sun many times per day and all year round on the Southern latitude varphi = -22(deg) 54'. Thanks to this and owing to a large number of sunny days at Rio de Janeiro, a high density of observations was achieved - 2900 East and 1730 West observations during the first 18 months. Results of the observations are available in electronic form in the SIMBAD database and at the World Wide Web page of the Observatório Nacional, Solar Radius Data: http://obsn.on.br/radius/.

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