A Planet Effective Temperature Complete Formula Te = [ Φ (1-a) S (β*N*cp)¹∕ ⁴ /4σ ]¹∕ ⁴

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Charon in enhanced color to bring out differences in surface composition.

Charon in true color, imaged by New Horizons

Charon’s (Pluto’s moon) Effective Temperature Calculation

Charon’s (Pluto’s moon) Effective Temperature Calculation:

So = 1.362 W/m² (So is the Solar constant)

Charon’s albedo: acharon = 0,2 to 0,5 at solar phase angle of 15°

let's have acharon = 0,2

1/R² = 1/39,48² = 1/1.558 = 0,0006418

Charon’s sidereal rotation period is 6,38723 days

Charon does N = 1/6,38723 rotations/ per day

Charon is an ice crust planet, very cratered, and Charon’s surface irradiation accepting factor Φcharon =1.

Charon’s surface is composed of water ice

Charon can be considered as a water ice crust surface planet,

cp.charon = 1 cal/gr*°C

β = 150 days*gr*°C /rotation*cal – it is the Planet Surface Solar Irradiation Absorbing-Emitting Universal Law constant

σ = 5,67*10⁻⁸ W/m²K⁴, a Stefan-Boltzmann constant

Charon’s effective temperature complete formula Te.charon is:

Te.charon = [ Φ (1-a) So (1/R²) (β*N*cp)¹∕ ⁴ /4σ ]¹∕ ⁴

Τe.charon = { 1*(1-0,20)*1.362 W/m² *0,0006418*[150 *(1/6,38723)* 1]¹∕ ⁴ /4*5,67*10⁻⁸ W/m²K⁴ }¹∕ ⁴ = 51,04 K

Te.charon = 51,04 K

Tsat.charon = 53 K (- 220 °C).

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  The faster a planet rotates (n2>n1) the higher is the planet’s average (mean) temperature T↑mean:

Tmin→ T↑mean ← Tmax

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