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 3

Local circumstances at the three stations (ingress and egress) used for the Abel inversion analysis.

Site	Time (UT)⁽¹⁾	Location on surface	Local solar time⁽²⁾
La Palma, ingress	23:48:27	251°E, 10°N	06:36 (sunrise)
La Palma, egress	23:50:52	18°E, 46°S	22:08 (sunset)
Helmos, ingress	23:45:38	254°E, 7°N	06:24 (sunrise)
Helmos, egress	23:47:58	12°E, 47°S	22:32 (sunset)
Calern, ingress	23:46:28	228°E, 32°N	08:08 (sunrise)
Calern, egress	23:49:15	50°E, 30°S	19:00 (sunset)

Notes. ⁽¹⁾UTC time at half-light level, 5 October 2017. ⁽²⁾One ‘hour’ corresponds to a 15° rotation of Triton. A local time before (resp. after) 12.0 h means morning (resp. evening) limb.

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