J/AJ/163/241 Residual stats. for Uranus & Neptune satellites (Brozovic+, 2022)
Orbits of the Irregular Satellites of Uranus and Neptune.
Brozovic M., Jacobson R.A.
<Astron. J., 163, 241 (2022)>
=2022AJ....163..241B 2022AJ....163..241B
ADC_Keywords: Solar system; Planets
Keywords: Irregular satellites ; Orbit determination ; Uranian satellites
; Neptunian satellites
Abstract:
We report on an ephemerides update for the irregular satellites of
Uranus and Neptune, including Nereid. Our data set contains
ground-based and Voyager 2 position measurements of the satellites.
Some of the new observations were reduced with respect to the GAIA
star catalog and represent high-quality, modern astrometry. The
orbital fits are based on the numerically integrated equations of
motion. We summarized results in terms of state vectors, orbital
uncertainties, and mean elements. A large number of the irregulars
have not been followed up in over a decade, and our study shows that
their orbits still contain significant uncertainties.
Description:
We present orbital ephemerides for the irregular satellites of Uranus
and Neptune that use the latest JPL planetary ephemeris de440. The new
ephemerides ura116 and nep101, as well as their 30000yr long versions,
can be obtained from the JPL horizons online ephemeris computation
service and from NASA's Navigation and Ancillary Information Facility.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 44 146 Residual statistics for the irregular satellites of
Uranus
table7.dat 40 47 Residual statistics for the irregular satellites of
Neptune
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See also:
J/A+AS/136/445 : CCD observations of Nereid (Veiga+, 1999)
J/A+A/580/A76 : Positions of satellites of giant planets (Gomes-Junior+, 2015)
J/AJ/155/184 : Irregular planet. satellites colors&shapes (Graykowski+, 2018)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Sat Observed satellite
11- 22 A12 --- Ref Observations reference (1)
24- 26 A3 --- Obs Observing site code
28- 29 I2 --- NRA [1/62] Number of RA measurements
31- 35 F5.3 mas rmsRA [0.033/3.626] Root-mean-square of the residuals in RA
37- 38 I2 --- NDE [1/62] Number of Dec measurements
40- 44 F5.3 mas rmsDE [0.024/2.174] Root-mean-square of the residuals in DE
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Note (1): Reference AJ144, listed in SatObs.txt compilation of astrometry
from the Minor Planet Center, is Jacobson+, 2012AJ....144..132J 2012AJ....144..132J.
Reference GOMES-JUNIOR is Gomes-Junior+, 2015, J/A+A/580/A76.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Sat Observed satellite
11- 18 A8 --- Ref Observations reference
20- 22 A3 --- Obs Observing site code
24- 25 I2 --- NRA [2/16] Number of RA measurements
27- 31 F5.3 mas rmsRA [0.072/1.066] Root-mean-square of the residuals in RA
33- 34 I2 --- NDE [2/16] Number of Dec measurements
36- 40 F5.3 mas rmsDE [0.035/1.132] Root-mean-square of the residuals in DE
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 20-Sep-2022