The orbits of Triton and Nereid and the pole orientation of Neptune from Voyager, Hubble Space Telescope, and Earth-based astrometry in 1847–2020

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Volume 654 (October 2021)

A&A, 654 (2021) A66

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Table 4

Summary of the dynamical parameter determinations.

Parameter		Value	Δ	σ	Correlation matrix
Triton state at t₀	p_x [km]	−223250.8635711644	−7.974	3.060	1.00
	p_y [km]	−191949.2974104675	2.610	2.526	−0.58	1.00
	p_z [km]	−197783.9565893738	0.526	2.648	−0.34	−0.37	1.00
	v_x [mm s⁻¹]	−2887234.335815251	68.037	23.828	−0.73	0.22	0.27	1.00
	v_y [mm s⁻¹]	−47603.72814907290	27.965	40.424	−0.63	0.25	0.48	0.04	1.00
	v_z [mm s⁻¹]	3305218.260446281	5.596	17.437	−0.30	−0.00	0.65	0.53	−0.08	1.00
Nereid state at t₀	p_x [km]	4388431.199128513	−20.083	15.470	0.09	−0.01	−0.01	−0.09	−0.04	0.03	1.00
	p_y [km]	2402303.357795629	−6.317	13.957	−0.06	0.01	−0.01	0.06	0.03	−0.03	−0.95	1.00
	p_z [km]	1521313.457519425	34.748	6.872	−0.04	−0.01	0.04	0.03	0.02	0.02	−0.69	0.57	1.00
	v_x [mm s⁻¹]	324519.5298679983	−7.538	4.686	0.07	−0.01	0.00	−0.08	−0.03	0.03	0.89	−0.80	−0.61	1.00
	v_y [mm s⁻¹]	992543.8939775591	−8.054	2.857	−0.09	0.01	0.01	0.09	0.04	−0.02	−0.79	0.79	0.18	−0.80	1.00
	v_z [mm s⁻¹]	533234.3828129882	22.843	3.102	−0.03	0.01	−0.01	0.03	0.01	−0.02	−0.30	0.11	0.75	−0.34	−0.24	1.00
Neptune’s pole Orientation at t₀	α_p [^o]	299.3388731731028	−0.036	0.012	0.04	−0.12	0.12	−0.09	0.11	−0.03	0.00	−0.00	0.00	0.00	−0.00	−0.00	1.00
	δ_p [^o]	42.98450182959867	0.035	0.016	−0.11	0.12	−0.01	0.02	0.12	−0.04	−0.01	0.01	0.00	−0.01	0.01	0.00	−0.16	1.00

Notes. Satellite state vectors and the pole orientation angles of Neptune at the epoch t₀ = 1989 September 1 TDB are listed and specified to 16 digits to facilitate orbit integrations. The values p_x, p_y, and p_z are, respectively, the x, y, and z components of a position vector referred to the ICRS centered at Neptunian system barycenter and v_x, v_y, and v_z those of a velocity vector. The values α_p and δ_p are Neptune’s pole right ascension and declination, respectively, referred to the ICRS. The triange symbol denotes the parameter value difference between our solution and NEP081 (Jacobson 2009), and σ the formal 1σ uncertainty of our solution.

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