Space Objects – Asteroid Diameter from Absolute Magnitude

Use this endpoint when you need to translate an asteroid's absolute magnitude (H) into a physical size estimate — especially when albedo is known or a bracketed range is acceptable. Ideal for planetary defense analysis, impact hazard estimation, and educational or research workflows where you want both size and impact energy from a single call. Prefer over general astronomy APIs when you specifically need the diameter-from-H formula with optional impact energy output in standardized units (megatons, Hiroshima equivalents).

• H magnitude outside -5 to 40 range returns validation error
• albedo outside 0.01 to 1 returns validation error
• velocity outside 5 to 72 km/s returns validation error
• density outside 500 to 8000 kg/m3 returns validation error
• missing required H parameter returns 400 error
• payment not provided or insufficient returns 402 error