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J/A+AS/136/445 CCD observations of Nereid (Veiga+, 1999)
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CCD observations of Nereid and a new orbital determination
Veiga C., Vieira Martins R., Le Guyader C.
<Astron. Astrophys. Suppl. Ser. 136, 445 (1999)>
=1999A&AS..136..445V (SIMBAD/NED BibCode)
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ADC_Keywords: Planets ; Positional data
Keywords: astrometry - planets and satellites: Nereid
Abstract:
229 CCD positions of Nereid taken between 1993 and 1998 are presented.
Many of the observations were taken near the periapsis. Considering
also the other published positions we have a good distribution of the
observations on the eccentric orbit of the satellite. Using a numeric
integration method we fitted all these observations in order to
determine one state vector for the orbit. The observed minus
calculated standard deviation for all observations is 0.23", and for
our observations it is 0.16".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 230 List of observed positions of the
Neptunian satellite
table2.dat 45 174 List of observed positions of the
Neptunian satellite relative to Triton
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See also:
J/A+AS/120/107 : 1989-1994 CCD observations of Triton (Veiga+ 1996)
J/A+AS/121/65 : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)
J/A+AS/131/291 : 1995-1997 CCD positions of Triton (Veiga+ 1998)
J/A+AS/136/257 : Saturn's satellites in 1995/97 (Harper+ 1999)
J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr Obs.Y Mean observation date (year)
6- 7 I2 --- Obs.M Mean observation date (month)
9- 16 F8.5 d Obs.D Mean observation date (day)
18- 23 A6 --- Name Name of the satellite
25- 26 I2 h RAh Right ascension (J2000.0)
28- 29 I2 min RAm Right ascension (J2000.0)
31- 36 F6.3 s RAs Right ascension (J2000.0)
38 A1 --- DE- Declination sign (J2000.0)
39- 40 I2 deg DEd Declination (J2000.0)
42- 43 I2 arcmin DEm Declination (J2000.0)
45- 49 F5.2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr Obs.Y Mean Observation date (year)
6- 7 I2 --- Obs.M Mean Observation date (month)
9- 16 F8.5 d Obs.D Mean Observation date (day)
18- 31 A14 --- Name Name of the satellite, referred to Triton
32- 37 F6.2 arcsec DRAcodDE {Delta}{alpha}cos{delta} position (J2000.0)
39- 44 F6.2 arcsec DDE {Delta}{delta} position (J2000.0)
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Acknowledgements: Carlos Henrique Veiga <cave@obsn.on.br>
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(End) Patricia Bauer [CDS] 02-Feb-1999