Solar diameter observations in 1998-1999 (Puliaev+, 2000)

Details Solar diameter observations in 1998-1999 (Puliaev+, 2000) Solar diameter observations in 1998-1999 (Puliaev+, 2000)

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..41430265p&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/143/265. Originally published in: 2000A&AS..143..265P

Astronomy and Astrophysics

Astronomy

Sun

Scientific paper

In January 1997, at the Observatsrio Nacional (ON), Rio de Janeiro, Brazil, digital CCD observations of the solar diameter began with a Danjon astrolabe adapted for solar observations and equipped with a variable angle reflecting prism. The prism enables observations of the Sun several times per day and all year round at the southern latitude φ=-22° 54'. As of June 1999, about 9000 observations have been made. The mean value of the apparent semi-diameter is 959.13"+/-0.01". Here we report on the results obtained between July 1998 and June 1999. In 162 days 4276 observations were made. For this period the mean apparent semi-diameter is 959.07"+/-0.02". No significant difference between the apparent semi-diameters is found as observed on the East and West sides of the meridian. (1 data file).

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