Table 1
Occultation prediction using Gaia-DR2 position for the star and JPL DE435/NEP081 for Neptune’s and Triton’s ephemerides and the additional offset deduced from the OPD observations.
| Occultation circumstances (5 October 2017) | |
| Predicted time of geocentric closest approach | 23h51m38.0s ± 8 s UTC |
| Predicted geocentric closest approach Triton-star | 196 mas |
| Position angle between Triton and star at closest approach | 347.51 deg |
| Geocentric shadow velocity at closest approach | 16.80 km s−1 |
| Retrieved time of geocentric closest approach | 23h51m28.92s ± 0.02 s UTC |
| Retrieved geocentric Triton-star closest approach | 196.58 ± 0.05 mas |
| Occulted star (from Gaia DR2) | |
| Star source ID (stellar catalogue) | 2610107911326516992 |
| Geocentric star position (ICRF) at epoch | α = 22h54m18.4364s ± 0.2 mas, δ = −08°00′08.318″ ± 0.2 mas |
| G-mag / RP mag | 12.5/12.0 |
| Stellar diameter projected at Triton’s distance(1) | 0.65 km |
Notes. (1)Using van Belle (1999)’s formulae and magnitudes B = 13.305, V = 12.655 (AAVSO photometric survey) and K = 11.080 (2mass) for the star; see http://vizier.u-strasbg.fr/viz-bin/VizieR
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