天文换算工具

1 Jy = 10⁻²³ erg/s/cm²/Hz
fλ = fν × c / λ²
m_AB = -2.5 × log₁₀(fν / 3631 Jy)

MJD = JD − 2400000.5
MJD 0 = 1858-11-17 00:00 UT

c = λν  |  E = hν  |  E = kT
h = 6.626×10⁻²⁷ erg·s  |  k_B = 1.381×10⁻¹⁶ erg/K
1 eV = 1.602×10⁻¹² erg  |  1 eV = 11604.5 K

D_C = (c / H₀) ∫₀^z dz′ / E(z′)     E(z) = √[ Ω_m(1+z)³ + Ω_Λ + Ω_k(1+z)² ]
D_L = (1 + z) D_C     D_A = D_C / (1 + z)
默认: H₀ = 70 km/s/Mpc, Ω_m = 0.3, Ω_Λ = 0.7（平坦宇宙 Ω_k = 0）

支持输入格式: 12h28m26.79s, +10d05m32.2s | 12:28:26.79, +10:05:32.2 | 12 28 26.79, +10 05 32.2
187.111626, +10.092305 | J122826.79+100532.2
1^h = 15° | 1° = 60′ = 3600″