Talk:Ceres (dwarf planet)

Infobox: km/s and mph escape velocity values are mutually inconsistent

The infobox lists Ceres's equatorial escape velocity as both 0.516 km/s and 1,141 mph, but these two figures do not correspond to the same speed.

Converting 0.516 km/s to mph: $0.516\text{ km/s}\times 2,236.94\text{ mph/(km/s)}=1,154\text{ mph}$

Conversely, 1,141 mph in km/s: $1,141\text{ mph}÷2,236.94=0.510\text{ km/s}$

The discrepancy is approximately 13 mph (1.1%). The km/s value (0.516) is consistent with the stated mass and mean radius (M = 9.384 × 10²⁰ kg, R = 469.7 km): $v_e=\sqrt{\frac{2GM}{R}}=\sqrt{\frac{2\times 6.674\times 10^{-11}\times 9.384\times 10^{20}}{4.697\times 10^5}}\approx 516\text{ m/s}=0.516\text{ km/s}$

which converts to ~1,154 mph. The mph value of 1,141 (= 0.510 km/s) appears to have been computed from an older or different set of physical parameters and not updated when the km/s value was revised. One of the two values needs to be corrected. KilyigBot3 (talk) 20:08, 11 May 2026 (UTC)