Credit the IAU W on the three moons whose orbits take terms from it, guard Tethys's, and say what Mimas's lock ceiling is
Since f8ee3ac, Mimas, Tethys and Phobos move by terms taken from their IAU W in NAIF's pck00011:
Mimas's -44.85 degree S5 term, Tethys's +2.23 on the same angle, and Phobos's tidal quadratic,
which also re-centred its M0 (91.059 to 94.239) and n. Their cards still credited only "JPL SSD
satellite mean elements". They now read, for Mimas, "JPL SSD satellite mean elements, epoch 2000
Jan 1, with the orbital terms of its IAU W (NAIF pck00011), within 7.5 degrees of Horizons from
1950 to 2100"; Tethys and Phobos likewise (0.3 and 1.3). build.ts requires any moon carrying such
terms to name the kernel. Control: the full ETL with the old card fails with "Phobos's orbit
carries terms taken from its IAU W, and its card ... credits only the table."
Tethys's half of the libration had no guard. Without its term it strays 2.09 degrees from Horizons
over 1950-2100 against 0.28 with it, under the general 3-degree ceiling, and its card rewrote
itself as "within 2.1"; no unit test loads bodies.json. Tethys now has its own track ceiling of
0.5 degrees. Control: the full ETL without Tethys's orbitFromW fails with "Tethys's mean elements
put it up to 2.09 degrees from Horizons ... (at most 0.5 expected)".
The lock ceiling's comment said Mimas's 10.15 degrees was "physical libration, which W carries and
Horizons shows as 5 to 9 degrees". Neither holds: Mimas's measured physical libration is 0.84
degrees (Tajeddine et al. 2014), W carries no such term, and Horizons, on the same W against its
integrated orbit, runs from -2.7 to +12.7 degrees over 1950-2100 (the review's scan every 20
days). The drawn face's 2.5 to 10.15 is the IAU's W and JPL's mean longitude disagreeing by about
6.3 degrees, W turning 6.0e-5 degrees a day faster than the row's n (381.9945550 against
381.9944948, 3.3 degrees over the span), and 2e = 2.3 degrees of eccentricity. The ceiling itself
is unchanged.
The baseline ETL from the cache passes and changes bodies.json on those three cards only.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -707,7 +707,7 @@
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"raDeg": 317.671,
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"decDeg": 52.893
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},
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"orbitSource": "JPL SSD satellite mean elements, epoch 1950 Jan 1, within 1.3 degrees of Horizons from 1950 to 2100",
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"orbitSource": "JPL SSD satellite mean elements, epoch 1950 Jan 1, with the orbital terms of its IAU W (NAIF pck00011), within 1.3 degrees of Horizons from 1950 to 2100",
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"parentBodyId": "mars",
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"rotationPeriodHours": 7.653844882637157,
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"rotationalElements": {
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@@ -1184,7 +1184,7 @@
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"raDeg": 40.589,
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"decDeg": 83.536
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},
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"orbitSource": "JPL SSD satellite mean elements, epoch 2000 Jan 1, within 7.5 degrees of Horizons from 1950 to 2100",
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"orbitSource": "JPL SSD satellite mean elements, epoch 2000 Jan 1, with the orbital terms of its IAU W (NAIF pck00011), within 7.5 degrees of Horizons from 1950 to 2100",
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"parentBodyId": "saturn",
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"rotationPeriodHours": 22.618127008672275,
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"rotationalElements": {
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@@ -1300,7 +1300,7 @@
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"raDeg": 40.578,
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"decDeg": 83.537
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},
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"orbitSource": "JPL SSD satellite mean elements, epoch 2000 Jan 1, within 0.3 degrees of Horizons from 1950 to 2100",
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"orbitSource": "JPL SSD satellite mean elements, epoch 2000 Jan 1, with the orbital terms of its IAU W (NAIF pck00011), within 0.3 degrees of Horizons from 1950 to 2100",
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"parentBodyId": "saturn",
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"rotationPeriodHours": 45.30726088829954,
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"rotationalElements": {
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