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 |
![]() |
Time of closest approach to shadow center (UT) (d) | 12h 41m 52.02 ± 0.18 s on 2019 July 17 |
Notes.
(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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