urn:nasa:pds:uranus_occ_support:data:uranus_occultation_ring_fit_rfrench_20201201
1.0
Uranus Ring Orbit Model R. French 12-01-2020.
1.14.0.0
Product_Ancillary
French, R. G.; McGhee-French, C. A.; Gordon, M. K.
2020
orbit model uranus rings
Uranus ring orbit model R. French 12-01-2020.
2020-12-08
1.0
Initial version
Science
Derived
This is the Uranus ring orbit model uranus_occultation_ring_fit_rfrench_20201201,
based on a non-linear least squares fit to ring occultation data.
Internally the run which produced this file is identified as ringfit_v1.8.Ur017L-RF-V0204,
on 12/01/2020.
The algorithm for the non-linear least squares fit to earthbased and spacecraft stellar
occultations, and radio science occultations, is documented in the following publication:
French, R. G. et al. (1993) "Geometry of the Saturn System from the 3 July 1989
Occultation of 28 Sgr and Voyager Observations" Icarus 103, 163-214.
The calculations generally follow the solar system barycenter vector approach described in
Appendix A.1.1. See also Appendix B for details of the calculations,
including a sample barycentric calculation for Saturn.
Note that the ring orbit model presented here differs from the French et al. (1993)
in several respects, as discussed in French, R. G. et al. (2010)
"Occultation Observations of Saturn's B Ring and Cassini Division", Astron. J.
139:1649-1667 - see pp. 1650-1651 for details.
Ring-Moon Systems
Earth-based Observations of Uranus System Stellar Occultations
Observing Campaign
urn:nasa:pds:context:investigation:observing_campaign.earth-based-uranus-stellar-occultations
ancillary_to_investigation
Uranus Rings
Uranian Ring System
Ring
urn:nasa:pds:context:target:ring.uranus.rings
ancillary_to_target
SPK
vgr2.ura111.bsp
SPK
earthstns_itrf93_040916.bsp
BPC
earth_720101_031229.bpc
SPK
pg3f0000r.bsp
SPK
pg490000r.bsp
LSK
naif0012.tls
These kernel files were used in the generation of the products in the parent bundle. Some or all of them may not have been used directly in the generation of this product.
J2000
1987-01-01T12:00:00Z
799
Uranus
5.7939513220000E+06
2.5559000000000E+04
3.5105610352900E-03
-3.4263605093516E-05
2.5751209427419E-07
7.7311142789503E+01
2.9482579245595E-04
1.5172187676545E+01
6.3677126332641E-04
701
Areil
8.3500000000000E+01
1.9090000000000E+05
702
Umbriel
8.5100000000000E+01
2.6600000000000E+05
703
Titania
2.2690000000000E+02
4.3630000000000E+05
704
Oberon
2.0530000000000E+02
5.8350000000000E+05
705
Miranda
4.3000000000000E+00
1.2990000000000E+05
10.1088/0004-6256/139/4/1649
French, R. G. et al. (2010)
"Occultation Observations of Saturn's B Ring and Cassini Division", Astron. J. 139, 1649-1667.
10.1006/icar.1993.1066
French, R. G. et al. (1993) "Geometry of the Saturn System from the 3 July 1989 Occultation of 28 Sgr and Voyager Observations" Icarus 103, 163-214./reference_text>
uranus_occultation_ring_fit_rfrench_20201201.tab
orbit-fits
2020-12-01T03:40:40
50899397330c53d04b7c8138574944a9
This file contains the Uranus ring orbit model uranus_occultation_ring_fit_rfrench_20201201,
based on a non-linear least squares fit to ring occultation data.
Internally the run which produced this file is identified as ringfit_v1.8.Ur017L-RF-V0204,
on 12/1/2020.
The algorithm for the non-linear least squares fit to earthbased and spacecraft stellar
occultations, and radio science occultations, is documented in the following publication:
French, R. G. et al. (1993) "Geometry of the Saturn System from the 3 July 1989
Occultation of 28 Sgr and Voyager Observations" Icarus 103, 163-214.
The calculations generally follow the solar system barycenter vector approach described in
Appendix A.1.1. See also Appendix B for details of the calculations,
including a sample barycentric calculation for Saturn.
Note that the ring orbit model presented here differs from the French et al. (1993)
in several respects, as discussed in French, R. G. et al. (2010)
"Occultation Observations of Saturn's B Ring and Cassini Division", Astron. J.
139:1649-1667 - see pp. 1650-1651 for details.
0
591
UTF-8 Text
Provides the column headers, separated by commas, for the data table.
591
12
Each record provides the orbit fit parameters for a single ring. Multiple modes are possible per ring. If a ring has multiple nodes, there will be a separate row in the table for each node.
Carriage-Return Line-Feed
26
0
502
Ring name
1
1
ASCII_String
10
The name of the ring to which the data applies.
Semimajor axis
2
12
ASCII_Real
21
Kilometer
The Semimajor axis of the specified ring.
Semimajor axis uncertainty
3
34
ASCII_Real
21
Kilometer
Uncertainty in the semimajor axis.
Eccentricity
4
56
ASCII_Real
21
Eccentricity.
Eccentricity uncertainty
5
78
ASCII_Real
21
Uncertainty in eccentricity (-9.99E99 if eccentricity is a fixed value).
-9.99E99
-9.99E99
Periapse longitude
6
100
ASCII_Real
21
Degree
Longitude of periapse at epoch, measured from the ascending node of the ring plane on the Earth's equator of J2000.
Periapse uncertainty
7
122
ASCII_Real
21
Degree
Uncertainty in periapse longitude in degrees (-9.99E99 if periapse longitude is a fixed value).
-9.99E99
-9.99E99
Periapse precession rate
8
144
ASCII_Real
21
Degree/Day
The periapse precession rate.
Periapse precession rate uncertainty
9
166
ASCII_Real
21
Degree/Day
Uncertainty in periapse precession rate (-9.99E99 if periapse precession rate is a fixed value).
-9.99E99
-9.99E99
Periapse precession rate method
10
188
ASCII_Integer
6
The method used to calculate the periapse regression rate. Options are:
0 = fitted value
1 = computed from Jn
2 = computed from Jn, and five major Uranian satellites.
Inclination
11
195
ASCII_Real
21
The inclination of the ring.
Inclination uncertainty
12
217
ASCII_Real
21
Uncertainty in inclination in degrees (-9.99E99 if inclination is a fixed value).
-9.99E99
-9.99E99
Node longitude
13
239
ASCII_Real
21
Degree
Longitude of node at epoch, measured from the ascending node of the ring plane on the Earth's equator of J2000.
Node uncertainty
14
261
ASCII_Real
21
Degree
Uncertainty in node longitude in degrees (-9.99E99 if node longitude is a fixed value).
-9.99E99
-9.99E99
Nodal regression rate
15
283
ASCII_Real
21
Degree/Day
The node regression rate.
Nodal regression rate uncertainty
16
305
ASCII_Real
21
Degree/Day
Uncertainty in nodal precession rate (-9.99E99 if nodal regression rate is a fixed value).
-9.99E99
-9.99E99
Nodal regression rate method
17
327
ASCII_Integer
6
The method used to calculate the nodal regression rate. Options are:
0 = fitted value
1 = computed from Jn
2 = computed from Jn, and five major Uranian satellites.
Wavenumber
18
334
ASCII_Integer
6
Wavenumber of normal mode. Multiple modes are possible per ring. If a ring has multiple nodes, there will be a separate row in the table for each node. (-999 indicates no normal mode for this ring).
-999
-999
Normal mode amplitude
19
341
ASCII_Real
21
Kilometer
Amplitude in km of normal mode (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Normal mode amplitude uncertainty
20
363
ASCII_Real
21
Kilometer
Uncertainty in amplitude of normal mode (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Normal mode phase
21
385
ASCII_Real
21
Degree
Phase in degrees of normal mode at epoch (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Normal mode phase uncertainty
22
407
ASCII_Real
21
Uncertainty of normal mode phase (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Normal mode pattern speed
23
429
ASCII_Real
21
Degree/Day
Pattern speed in degrees/day of normal mode (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Normal mode pattern speed uncertainty
24
451
ASCII_Real
21
Uncertainty in pattern speed in degrees/day of normal mode phase (-9.99E99 if no normal mode for this ring).
-9.99E99
-9.99E99
Number of points (Npts)
25
473
ASCII_Integer
6
Number of fitted data points for this ring.
RMS
26
480
ASCII_Real
21
Kilometer
RMS residuals for this ring.
uranus_occultation_ring_fit_rfrench_20201201.txt
annotated-fit
2020-12-01T23:44:27
fa5fa9aa064af2b5b819d4fe13cf65dc
This file docouments the Uranus ring orbit fit model entitled
uranus_occultation_ring_fit_rfrench_20201201
This is an annotated version of the output file produced by the IDL
program ringfit_infile_v1.8.pro. The algorithm for the non-linear
least squares fit to earthbased and spacecraft stellar occultations, and
radio science occultations, is documented in the following publication:
French, R. G. et al. (1993) "Geometry of the Saturn System from the 3 July 1989
Occultation of 28 Sgr and Voyager Observations" Icarus 103, 163-214.
The calculations generally follow the solar system barycenter vector approach described in
Appendix A.1.1. See also Appendix B for details of the calculations,
including a sample barycentric calculation for Saturn.
Note that the geometrical model presented here differs from the French et al. (1993)
in several respects, as discussed in French, R. G. et al. (2010)
"Occultation Observations of Saturn's B Ring and Cassini Division", Astron. J.
139:1649-1667 - see pp. 1650-1651 for details.
Detailed intermediate calculations are included for a representative Earth-based ring occultation observation
Detailed intermediate calculations are included for a representative spacecraft-based stellar occultation observation
Detailed intermediate calculations are included for a representative radio science occultation observation
0
UTF-8 Text
Carriage-Return Line-Feed
uranus_occultation_ring_fit_rfrench_input_data_20201201.tab
input-data
2020-12-01T23:44:27
9f2d7e9907d6d462d34ee814b32a36e8
This table provides information to identify the specific ring occultation
observations used as inputs for the Uranus ring orbit model
uranus_occultation_ring_fit_rfrench_20201201.
This is an input file for the ring fit program. It identifies individual fragments of
the occultation events used. Each fragment is identified by:
- the occulted star (as an index number [0,114])
- occultation event (as an index number [0,40])
- observatory codes (as an abbreviation or index number)
- the specific ring (as an index number [1,10])
- the direction of the occultation track (-1 ingress, 1 egress)
The key to the star index numbers is given in the file
uranus_occultation_ring_fit_rfrench_input_stars_20201201.tab described in another section
of this label file.
The key to the occultation event index numbers is given in the file
uranus_occultation_ring_fit_rfrench_input_events_20201201.tab described in another section
of this label file.
The key to the observatory codes is given in the file
uranus_occultation_ring_fit_rfrench_input_observatories_20201201.tab describe in another section
of this label file.
The resulting ring orbit model is given in the file uranus_occultation_ring_fit_rfrench_20201201.tab
described above.
0
94
UTF-8 Text
Provides the column headers, separated by commas, for the data table.
94
662
This table provides information to identify the specific ring occultation observations used as inputs for the Uranus ring orbit model uranus_occultation_ring_fit_rfrench_20201201.
Carriage-Return Line-Feed
6
0
58
Star number
1
1
ASCII_Integer
5
Index number of the occultation star within uranus_occultation_stars.tab (0 indicates a radio science occultation).
Occultation number
2
7
ASCII_Integer
6
Index number of stellar occultation event within uranus_occultation_events.tab.
Observatory code
3
14
ASCII_String
6
Observatory location within uranus_occultation_observatories.tab.
Ring number
4
21
ASCII_Integer
3
Index number of Uranian ring, moving radially outward from 1:ring six to 10:epsilon.
Direction
5
25
ASCII_Integer
3
Occultation direction: -1 for ingress, 1 for egress.
Observed time UTC
6
29
ASCII_String
28
Observed mid-time of ring occultation profile.
uranus_occultation_ring_fit_rfrench_input_events_20201201.tab
input-events
2020-12-01T23:44:27
83fcb6fdb992a7fc48ed4a429e854b67
The input files for the ring fit program identify individual fragments of
the occultation events used. These are referenced in those files by occultation event (as an
index number [0,42]) and the specific ring (as an index number [1,10]).
This file provides the key to the occultation event index numbers.
0
62
UTF-8 Text
Provides the column headers, separated by commas, for the data table.
62
29
Associtates occultation number with the occultation event code and the occultation date.
Carriage-Return Line-Feed
3
0
32
Occultation number
1
1
ASCII_Integer
5
Index number of stellar occultation event.
Occultation event code
2
7
ASCII_String
11
Event code name; typically, the name of the occulted star.
Occultation date
3
19
ASCII_Date_YMD
12
day
Approximate date (yyyy-mm-dd) of the occultation event.
uranus_occultation_ring_fit_rfrench_input_observatories_20201201.tab
input-observatories
2020-12-01T23:44:27
811f67b162d9573e51a66ba05302ef2a
This file contains a list of Earth-based observatory codes, the
corresponding topocentric locations (latitude, E longitude,
and altitude), and the observatory and telescope names for those sites
used in the data files of ring occultation times used for the ring
ring orbit model uranus_occultation_ring_fit_rfrench_data_20201201.tab.
Not included are observatory codes KAO and HST, each of which have
SPICE kernels describing their motion relative to the center of the
earth over the course of the corresponding occultations.
0
83
UTF-8 Text
Provides the column headers, separated by commas, for the data table.
83
14
This file provides additional details for the observatories referenced by Earth-based observatory codes
listed in the uranus_occultation_ring_fit_rfrench_input_data_20201201.tab file described
above. This file provides the corresponding topocentric locations, and the observatory and
telescope names.
Note: Two entries, TEN and TEE have identical parameters. TEN and TEE are used to keep track of
the fact that the timing for this event was different on egress than on ingress, which is handled
by assigning a different observatory code and fitting separately for offset times for TEN and TEE.
Carriage-Return Line-Feed
6
0
116
Observatory code
1
1
ASCII_String
5
Abbreviation for observatory name, used in data files for ring orbit fit.
Latitude
2
7
ASCII_Real
11
Degree
Latitude of observatory, in degrees.
East Longitude
3
19
ASCII_Real
11
Degree
East longitude of observatory, in degrees.
Altitude
4
31
ASCII_Real
11
Kilometer
Altitude of observatory, in km.
Observatory name
5
43
ASCII_String
50
Name of observatory.
Telescope
6
94
ASCII_String
21
Aperture or other identifying characteristic of telescope.
uranus_occultation_ring_fit_rfrench_input_stars_20201201.csv
input-stars
2020-12-01T23:44:27
b2885f2a8e599081f4a97e82a72c9e49
This file associates the star indices used in the
uranus_occultation_ring_fit_rfrench_input_data_20201201.tab file (described above)
with the "star names" used through the Uranus occultation archives, star catalog IDs,
and star positions for the occultation stars used in the generation of the ring orbit model.
0
185
UTF-8 Text
Provides the column headers, separated by commas, for the data table. The second provides the units for the field.
185
PDS DSV 1
28
Carriage-Return Line-Feed
Comma
15
0
300
Star Number
1
ASCII_Integer
Index number used to identify star position used in ring orbit fit.
Star Name
2
ASCII_String
Internal shorthand name for the occultation star.
Source Catalog
3
ASCII_String
Name of source catalog for star position (e.g., Hipparcos, 2MASS, UCAC4).
Catalog ID
4
ASCII_String
The identification number of the star within the Source Catalog.
RA(ICRS)
5
ASCII_Real
Degree
Mean right ascencion International Celestial Reference System (ICRS) J2000.0 epoch.
DE(ICRS)
6
ASCII_Real
Degree
Mean declination International Celestial Reference System (ICRS) J2000.0 epoch.
Epoch
7
ASCII_String
The epoch of RA(ICRS)/DE(ICRS).
Plx
8
ASCII_Real
milli-second of arc
Trigonometric parallax in millisecond of arc.
pmRA
9
ASCII_Real
milli-second of arc per year
Proper motion in RA in equatorial coordinates in millisecond of arc per year.
pmDE
10
ASCII_Real
milli-second of arc per year
Proper motion in Dec in equatorial coordinates in milli-second of arc per year.
e_RAdeg
11
ASCII_Real
millisecond of arc
Standard error in RA*cos(delta) in millisecond of arc.
e_DEdeg
12
ASCII_Real
millisecond of arc
Standard error in DE in millisecond of arc.
e_Plx
13
ASCII_Real
millisecond of arc
Standard error in Plx in millisecond of arc.
e_pmRA
14
ASCII_Real
millisecond of arc
Standard error in pmRA in millisecond of arc.
e_pmDE
15
ASCII_Real
millisecond of arc
Standard error in pmDE in millisecond of arc.