Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations

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Table 4

Atmospheric pressure on Triton.

Date	Pressure at 1400 km p₁₄₀₀ (µbar)	Pressure at the surface p_surf (µbar)⁽¹⁾	Fit quality⁽²⁾
This work

25 August 1989⁽³⁾	1.0 ± 0.2	12.5 ± 0.5	N/A
18 July 1997			0.95
21 May 2008			0.93
5 October 2017	1.18 ± 0.03	(14.1 ± 0.4)	0.85

Other works

25 August 1989⁽⁴⁾	N/A	14±2	N/A
14 August 1995⁽⁵⁾	1.4 ± 0.1	(17±1)	N/A
18 July 1997⁽⁶⁾	2.23 ± 0.28	(26.8 ± 3.4)	N/A
4 November 1997 ⁽⁷⁾	1.76 ± 0.02	(21.1 ± 0.2)	N/A

Notes. ⁽¹⁾The values in parentheses assume a constant ratio of 12.0 between the pressures at the surface and at 1400 km, as derived from our best model (Fig. 10). ⁽²⁾See discussion in Sect. 4.2. ⁽³⁾Using our own inversion of the V2 RSS phase delay profile (see text). ⁽⁴⁾G95. ⁽⁵⁾Olkin et al. (1997). ⁽⁶⁾Elliot et al. (2000a, 2003) ⁽⁷⁾This value is the average over ingress and egress obtained by Elliot et al. (2003).

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