Neptune’s ring arcs from VLT/SPHERE-IRDIS near-infrared observations

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Table 2

Investigating the 42:43 CIR and the 42:43 CER corotation models with Galatea.

Resonance type	Drift in mean motion (Δn)	Mismatch (Δ a)	ΔL ^(*)
	(deg day⁻¹)	(m)	(deg)
42:43 CIR with Galatea	n_CIR − n_arcs ≈ (5.95 ± 0.03) × 10⁻³	a_arcs − a_CIR ≈ 305 ± 2	~ (58.8 ± 0.3)
42:43 CER with Galatea	n_CER − n_arcs ≈ (39.16 ± 0.03) × 10⁻³	a_arcs − a_CER ≈ 2004 ± 2	~ (26.4 ± 0.3)

Notes. ^(*) Δ L represents the difference for the arcs’ longitude (assuming a trapping in the CIR or the CER) over ~27.01364 yr (between the 1989 Voyager data and our 2016 VLT SPHERE-IRDIS data).

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