![Triton: Voyager 2 photomosaic of Triton's sub-Neptunian hemisphere[caption 1]](https://impro.usercontent.one/appid/oneComWsb/domain/cristos-vournas.com/media/cristos-vournas.com/onewebmedia/i285978589388818034.jpg?etag=%221b68c-5db44839af051%22&sourceContentType= "Triton: Voyager 2 photomosaic of Triton's sub-Neptunian hemisphere[caption 1]")
Triton: Voyager 2 photomosaic of Triton's sub-Neptunian hemisphere[caption 1]
11. Triton’s (Neptune’s satellite) Mean Surface Temperature calculation
Tmean.triton
So = 1.362 W/m² (So is the Solar constant)
Triton’s albedo: atriton = 0,76
1/R² = 1/30,33² = 1/919,9 = 0,001087
Triton’s sidereal rotation period is 5 days 21 hours
Triton does N = 1/5,875 rotations/ per day (synchronous rotation)
Triton is a rocky planet, with no atmosphere,
Triton’s surface irradiation accepting factor Φtriton = 0,47
Triton can be considered as a nitrogen (N2) 55 % crust surface planet,
Cp.nitrogen = 0,2448 cal/gr*oC,
cp.H2O = 1 cal/gr*oC,
cp.CO2 = 0,1435 cal/gr*oC
Cp.triton.surface = Cp.nitrogen*0,55 + Cp.H2O * 0,25 + Cp.CO2*0,20 = 0,2448*0,55 + 1*0,25 + 0,1435*0,2 = 0,13464 + 0,25 + 0,0269= 0,4116 cal/gr*oC
β = 150 days*gr*oC/rotation*cal – it is the Planet Surface Solar Irradiation INTERACTING-Emitting Universal Law constant
σ = 5,67*10⁻⁸ W/m²K⁴, a Stefan-Boltzmann constant
Triton’s mean surface temperature equation Tmean.triton is:
Tmean.triton = [ Φ (1-a) So (1/R²) (β*N*cp)¹∕ ⁴ /4σ ]¹∕ ⁴
Τmean.triton = { 0,47* (1-0,76)*1.362 W/m² *0,001087*[150 *(1/5,875)* 0,4116]¹∕ ⁴ /4*5,67*10⁻⁸ W/m²K⁴ }¹∕ ⁴ = (1.325.315,91)¹∕ ⁴ = 33,92 K
Tmean.triton = 33,92 K
Tsat.triton = 38 K (−235.2 °C).
Neptune: Image of Neptune taken by NASA's Voyager 2 in 1989
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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 ← T↓max
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