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Table 3
Precession quantities of the ecliptic derived from VSOP2013 and DE422/INPOP10a ephemerides and comparison with the IAU 2006 model.
| Unit | t1 | t2 | t3 | t4 | t5 | ||
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| Fit to DE422 | PA | ′′ | 4.19903 | 0.19401 | −2.23533 × 10-4 | −1.03944 × 10-6 | 2.15694 × 10-9 |
| ΔPA | μas | −65 | 18 | 1 | −0.1 | 0.01 | |
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| QA | ′′ | −46.81099 | 0.05102 | 5.21368 × 10-4 | −5.5808 × 10-7 | −1.2059 × 10-9 | |
| ΔQA | μas | 28 | −11 | −3 | 0.1 | 0.02 | |
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| Fit to INPOP10a | P A | ′′ | 4.19906 | 0.19400 | −2.23575 × 10-4 | −1.02313 × 10-6 | 2.26088 × 10-9 |
| ΔPA | μas | −27 | 17 | 1 | −0.1 | −0.001 | |
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| QA | ′′ | −46.81102 | 0.05102 | 5.21248 × 10-4 | −5.64478 × 10-7 | 5.5757 × 10-10 | |
| ΔQA | μas | −10 | −12 | −3 | 0.1 | 0.02 | |
Notes. ΔPA and ΔQA are calculated in sense of [New model − IAU 2006].
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