How heavy is an orange black hole?

LITHawking's temperature for a Schwarzschild black hole is T = ħc³/(8πGMk_B), about 6.17 × 10⁻⁸ K for one solar mass, far colder than the 2.725 K microwave background. Real astrophysical black holes are black; their Hawking glow peaks at kilometre radio wavelengths. The orange you see in black-hole pictures is the accretion disk or a false-colour map, never Hawking light.

COMPUTEDSlide the mass down from one Sun. When the Wien peak b/T reaches 600 nm, the hole would glow orange (T ≈ 4,830 K). The page solves for that mass: about 2.5 × 10¹⁹ kg, a small moon, squeezed inside a horizon about 38 nm across. −/+: a heavier (cooler) and lighter (hotter) twin flank the orange one at zero.

log₁₀ M/kg find orange

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