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J/A+AS/143/265      Solar diameter observations in 1998-1999    (Puliaev+, 2000)
Solar diameter observations at Observatorio Nacional in 1998-1999.
    Puliaev S., Penna J.L., Jilinski E.G., Andrei A.H.
   <Astron. Astrophys. Suppl. Ser. 143, 265 (2000)>
   =2000A&AS..143..265P
ADC_Keywords: Sun

Keywords: Sun: general, fundamental parameters


Abstract:
    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.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table.dat         43      162   Daily average of the raw results from solar
                              semi-diameter observations by the
                              Solar Astrolabe at Rio de Janeiro.


See also:
   J/A+AS/135/227 : Solar diameter observations in 1997-1998 (Jilinski+, 1999)
   J/A+A/375/614  : Astrolabe observations of the Sun in 1990-2000 (Noel, 2001)
   J/A+AS/102/11  : Astrolabe observations of the Sun in 1990-1992 (Noel 1993)
   J/A+AS/106/327 : Observations of the Sun during 1993 at Santiago (Noel 1994)
   J/A+AS/113/131 : Observations of the Sun during 1994 (Noel, 1995)
   J/A+AS/132/195 : Astrolabe observations of the Sun in 1995-1997 (Noel 1998)
   J/A+AS/110/351 : Sun observations in 1992 (Sanchez+, 1995)


Byte-by-byte Description of file: table.dat

   Bytes Format Units      Label   Explanations

   1-  2  I2    ---        Nobs    Number of observations
   5- 10  F6.2  arcsec     Diam    Daily average semi-diameter
  13- 16  F4.2  arcsec     e_Diam  Standard error of the average semi-diameter
  19- 28  A10 "YYYY/DD/MM" Date    Year, month and day of the observations
  31- 37  I7    d          MJD     Modified Julian Date, of the eastern transit
  40- 43  F4.2  arcsec     Err     The error of a single observation, given by
                                    the standard deviation


Acknowledgements: Jucira Lousada Penna 

(End)                                        Patricia Bauer [CDS]    10-Jun-2002