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Dear SPICE Users,
<br>
<br>
As of 2004 September 21, NAIF is releasing the text
<br>
PCK file
<br>
<br>
pck00008.tpc
<br>
<br>
The file is available on NAIF's server
<br>
<br>
naif.jpl.nasa.gov
<br>
<br>
in the path
<br>
<br>
pub/naif/generic_kernels/pck
<br>
<br>
The file may be picked up via anonymous ftp. Use ASCII mode to
<br>
transfer the file.
<br>
<br>
This kernel contains rotational elements and triaxial ellipsoid
<br>
size/shape models for the sun, planets, natural satellites, and
<br>
selected asteroids.
<br>
<br>
The data in the file are taken, with few exceptions, from
<br>
<br>
[1] Seidelmann, P.K., Abalakin, V.K., Bursa, M., Davies, M.E.,
<br>
Bergh, C. de, Lieske, J.H., Oberst, J., Simon, J.L.,
<br>
Standish, E.M., Stooke, P., and Thomas, P.C. (2002).
<br>
"Report of the IAU/IAG Working Group on Cartographic
<br>
Coordinates and Rotational Elements of the Planets and
<br>
Satellites: 2000," Celestial Mechanics and Dynamical
<br>
Astronomy, v.82, Issue 1, pp. 83-111.
<br>
<br>
Source [1] is the latest published version of this working group
report,
<br>
although a preprint of the 2003 report is available. That preprint
<br>
<br>
[2] Seidelmann, P.K., Archinal, B.A., A'Hearn, M.F.,
<br>
Cruikshank, D.P., Hilton, J.L., Keller, H.U., Oberst, J.,
<br>
Simon, J.L., Stooke, P., Tholen, D.J., and Thomas, P.C.
<br>
"Report of the IAU/IAG Working Group on Cartographic
<br>
Coordinates and Rotational Elements of the Planets and
<br>
Satellites: 2003," Unpublished.
<br>
<br>
states (p. 2) that there are no updates for the data for planets
<br>
and satellites.
<br>
<br>
The complete set of data sources is documented in the file.
<br>
<br>
This file supersedes the PCK file
<br>
<br>
pck00007.tpc
<br>
<br>
A comparison of the data differences between the two files is included
<br>
below. The differences were derived using the N0057 version of the
<br>
Fortran SPICE Toolkit. Concerning Neptune: earlier Toolkit versions
<br>
cannot make use of the trigonometric polynomial terms appearing in the
<br>
rotational elements for Neptune. The data for Neptune from [1] have
<br>
not changed from the previous report.
<br>
<br>
Another change of note evident from the comparison report is that both
<br>
the kernel variable names and values for the earth north geomagnetic
<br>
centered dipole have been updated; the old kernel variable names
invited
<br>
confusion with the earth's north magnetic pole.
<br>
<br>
The new file is more thoroughly documented via in-line comments
<br>
than its predecessor; those differences are not shown below.
<br>
<br>
This file is not intended to supersede PCK files adopted by flight
<br>
projects.
<br>
<br>
Please contact NAIF if you have questions about the file.
<br>
<br>
-Nat Bachman, for the NAIF team
<br>
<br>
<a class="moz-txt-link-abbreviated"
href="mailto:Nathaniel.Bachman@jpl.nasa.gov">Nathaniel.Bachman@jpl.nasa.gov</a>
<br>
<br>
<br>
<br>
<br>
Comparison of PCK files
<br>
=======================
<br>
<br>
<br>
<br>
pck00008.tpc
/kernels/gen/pck/pck00007.tpc
<br>
--------------------------------------------------------------------------------
<br>
<br>
<br>
Number of bodies in PCK 1: 82 Number of bodies in PCK 2:
79
<br>
<br>
<br>
Bodies Bodies
<br>
in PCK 1 and not in PCK2: in PCK 2 and not in PCK1:
<br>
<br>
2000004
<br>
2000216
<br>
2000433
<br>
<br>
<br>
Number of kernel variables Number of kernel variables
<br>
in PCK 1: 456 in PCK 2:
443
<br>
<br>
<br>
Kernel variables Kernel variables
<br>
in PCK 1 and not in PCK2: in PCK 2 and not in PCK1:
<br>
<br>
BODY2000004_LONG_AXIS BODY399_MAG_NORTH_POLE_LAT
<br>
BODY2000004_PM BODY399_MAG_NORTH_POLE_LON
<br>
BODY2000004_POLE_DEC
<br>
BODY2000004_POLE_RA
<br>
BODY2000216_RADII
<br>
BODY2000433_LONG_AXIS
<br>
BODY2000433_PM
<br>
BODY2000433_POLE_DEC
<br>
BODY2000433_POLE_RA
<br>
BODY2000433_RADII
<br>
BODY399_N_GEOMAG_CTR_DIPOLE_LAT
<br>
BODY399_N_GEOMAG_CTR_DIPOLE_LON
<br>
BODY899_NUT_PREC_DEC
<br>
BODY899_NUT_PREC_PM
<br>
BODY899_NUT_PREC_RA
<br>
<br>
<br>
<br>
Non-Zero Attitude Differences at ET 0.0000000000:
<br>
------------------------------------------------
<br>
<br>
Body Code Rotation Angle (deg)
<br>
<br>
899 0.51000032259788
<br>
502 0.35200026675730
<br>
499 0.27065768736905
<br>
504 0.22000000000004
<br>
503 0.023999999999999
<br>
399 0.013000000000004
<br>
199 0.0020000000000209
<br>
<br>
<br>
Non-Zero Angular Velocity Differences at ET
0.0000000000:
<br>
--------------------------------------------------------
<br>
<br>
Body Code Delta Angular Velocity (deg/sec)
<br>
<br>
899 0.000055252213121797
<br>
499 0.000000039929090588140
<br>
502 0.00000000013529909999411
<br>
399 0.00000000000000000077650260777918
<br>
504 0.000000000000000000036900632556860
<br>
503 0.000000000000000000012891156574459
<br>
<br>
<br>
Non-Zero Attitude Differences at ET -315576000.0:
<br>
------------------------------------------------
<br>
<br>
Body Code Rotation Angle (deg)
<br>
<br>
899 0.51000351704351
<br>
502 0.35199992471214
<br>
499 0.26810623627666
<br>
504 0.22000000000762
<br>
503 0.023999999966254
<br>
399 0.012999999849272
<br>
199 0.0019999999993623
<br>
<br>
<br>
Non-Zero Angular Velocity Differences at ET
-315576000.0:
<br>
--------------------------------------------------------
<br>
<br>
Body Code Delta Angular Velocity (deg/sec)
<br>
<br>
899 0.000055252558322891
<br>
499 0.000000036217301442218
<br>
502 0.000000000086699910507102
<br>
399 0.00000000000000000077650306282665
<br>
503 0.000000000000000000019715886525643
<br>
504 0.0000000000000000000068247299511842
<br>
199 0.0000000000000000000061136368809978
<br>
301 0.0000000000000000000053081232953655
<br>
<br>
<br>
<br>
<br>
Non-Zero Radius Differences:
<br>
---------------------------
<br>
<br>
Body Code PCK 1 Radii PCK 2 Radii
<br>
<br>
499 (3396.19, 3396.19, 3376.20) (3397.00, 3397.00,
3375.00)
<br>
501 (1829.40, 1819.30, 1815.70) (1826.00, 1815.00,
1812.00)
<br>
502 (1564.13, 1561.23, 1560.93) (1562.00, 1560.00,
1559.00)
<br>
503 (2632.40, 2632.29, 2632.35) (2635.00, 2633.00,
2633.00)
<br>
504 (2409.40, 2409.20, 2409.30) (2409.00, 2409.00,
2409.00)
<br>
505 (125.000, 73.0000, 64.0000) (131.000, 73.0000,
67.0000)
<br>
514 (58.0000, 49.0000, 42.0000) (50.0000, 50.0000,
50.0000)
<br>
515 (10.0000, 8.00000, 7.00000) (13.0000, 10.0000,
8.00000)
<br>
516 (21.5000, 21.5000, 21.5000) (20.0000, 20.0000,
20.0000)
<br>
607 (164.000, 130.000, 107.000) (180.000, 140.000,
112.500)
<br>
<br>
</big><br>
<br>
<br>
</tt>
<br>
<br>
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