Table 1.

Adopted parameters for the light curve fit and results.

Adopted parameters and physical constant
Pluto’s geocentric distance 4.91063 × 109 km
Pluto’s shadow velocity at 12h 42m on 2019 July 17 24.18 km s−1 (geocentric), 24.51 km s−1 (Haleakala sta. (a))
Pluto’s mass and radius (b) GM = 8.696 × 1011 m3 s−2, RP = 1187 km
N2 molecular mass μ = 4.652 × 10−26 kg
N2 molecular refractivity (c) K = 1.091 × 10−23
Boltzmann constant kB = 1.380626 × 10−23 J K−1

Results

Pressure
Pressure at 1215 km, p1215
Surface pressure, psurf
Astrometry
Closest approach to Pluto’s shadow center km
Time of closest approach to shadow center (UT) (d) 12h 41m 52.02 ± 0.18 s on 2019 July 17

Notes.

(a)

For the Earth rotation correction, the WG84 shape model is used.

(b)

Stern et al. (2015), where G is the constant of gravitation.

(d)

A possible systematic bias is several seconds (see Sect. 3.1).

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