J/A+A/400/1095 1995-1999 CCD observation of Saturnian satellite (Veiga+, 2003)
CCD astrometric observations of Saturnian satellites.
Veiga C.H., Vieira Martins R., Vienne A., Thuillot W., Arlot J.-E.
<Astron. Astrophys. 400, 1095 (2003)>
=2003A&A...400.1095V 2003A&A...400.1095V
ADC_Keywords: Planets ; Positional data
Keywords: planets and satellites: individual: Saturn astrometry
Abstract:
Astrometric positions of the first eight largest Saturnian satellites
and the Lagrangian satellites Helene, Telesto and Calypso are
presented from 493 CCD frames taken at the oppositions in 1995 through
1999. The images were obtained over 27 nights. Observed positions are
compared with the calculated ones from Vienne and Duriez
(1995A&A...297..588V 1995A&A...297..588V) TASS 1.7 for the large satellites and from JPL
positions for the Lagrangian satellites. The rms is about 0.12" for
the former but 0.20" for Iapetus and 0.28" for Hyperion. For the
Lagrangian satellites it is about 0.21" for Helene, 2.02" for Telesto
and 0.60" for Calypso.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 123 3289 List of observed positions of the Saturnian
satellites
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See also:
J/A+A/380/727 : 1995 Saturnian satellite observations (Vienne+, 2001)
J/A+AS/139/47 : 1995 Saturnian satellites mutual events (Emelianov+, 1999)
J/A+A/383/296 : Saturnian Satellites positions (1996-2000) (Peng+, 2002)
J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)
J/A+AS/143/405 : Astrometric observations of Helene (Veiga+, 2000)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Opp Opposition year code number
(1=1874 to 122=1999)
5- 22 A18 s DateObs Observation dateTE
24- 29 F6.3 s TT-UTC TT-UTC to the nearest tenth of second
31- 33 I3 --- Obs [874] Observatory code
(Laboratorio Nacional de Astrofisica, Brazil)
35- 37 I3 --- Ref [303] Reference code catalog (we have chosen
303 for the present observations)
39 I1 --- ObsType [0/1] Observation type
0=RA, DE; 1=ΔRA*cosDE, ΔDE (1)
41- 43 A3 --- Objs Subject satellite, reference satellite (2)
45 I1 --- f_Obs1 [1] Flag of presence of the first coordinate
46 I1 --- f_Obs2 [1] Flag of presence of the second coordinate
49- 60 F12.7 --- Obs1 First coordinate (3)
63- 74 F12.7 --- Obs2 Second coordinate (3)
76 I1 --- Sys [0/2] Reference system (4)
78 I1 --- Frame [0/2] Reference frame (5)
80- 86 F7.3 arcsec O-C1 ?=999.999 First residual of observations
computed with TASS1.7 (6)
88- 94 F7.3 arcsec O-C2 ?=999.999 Second residual of observations
computed with TASS1.7 (6)
97 I1 --- Nsat Number of the satellite used as reference in
the computation of O-C (2)
100 I1 --- n_NSerie [0/1] 0 for no meaning and 1 when the frame was
not used in the computation of the scale and
the direction of the series
102-103 I2 --- NSerie Number of the series, the scale and orientation
are the same for all observations of one series
105-113 F9.3 pix Xpos ?=99999.999 Original X coordinate
115-123 F9.3 pix Ypos ?=99999.999 Original Y coordinate
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Note (1): Observation type:
0: RA, DE
1: ΔRA*cosDE, ΔDE
2: ΔRA, ΔDE
3: position angle, separation
Note (2): Satellite numbers:
0 for Saturn,
1 to 8 for S1 to S8, 12 for Helene, 13 for Telesto, 14 for Calypso,
C for the center of the plate which is not a physical object.
Note (3): Obs1 and Obs2 are in arcsec but in degree when Sat = C*
When Obstype=0, Obs1=RA, Obs2=DE
When ObsType=1, Obs1=ΔRA*cosDE,Obs2=ΔDE
Note (4): Reference system code:
0: mean equator and equinox B1950,
1: true equator and equinox of date of observation,
2: mean equator and equinox of J2000
Note (5): Reference frame code:
0: topocentric,
1: geocentric,
2: heliocentric
Note (6): Residuals of observations:
999.999 when the residuals are not computed
888.888 when the residuals are greater than 100 in absolute value
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Acknowledgements: Carlos Henrique Veiga,
(End) Patricia Bauer [CDS] 17-Mar-2003