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J/A+AS/135/227      Solar diameter observations in 1997-1998   (Jilinski+, 1999)
Solar diameter observations at Observatorio Nacional in 1997-1998.
    Jilinski E.G., Puliaev S., Penna J.L., Andrei A.H., Laclare F.
   <Astron. Astrophys. Suppl. Ser. 135, 227 (1999)>
   =1999A&AS..135..227J
ADC_Keywords: Sun

Keywords: Sun: general - fundamental parameter


Abstract:
    In January 1997, at the Observatsrio 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 φ=-22°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.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table.dat         43      245   Daily average of the raw results from solar
                              semi-diameter observations by the
                              Solar Astrolabe at Rio de Janeiro


See also:
   J/A+AS/143/265 : Solar diameter observations in 1998-1999 (Puliaev+, 2000)
   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