* Vimpact - Velocity at atmospheric entry.
{"Image DocumentName": "Vimpact - Velocity at atmospheric entry.", "Image ImageDescription": "Vinfinity - Relative velocity at atmospheric entry neglecting the acceleration caused by the Earth s gravity field, often called the hyperbolic excess velocity. (Vinfinity2 = Vimpact2 - Vescape2, where Vescape = ~11.2 km/s is the Earth escape velocity.)   H - Absolute Magnitude, a measure of the intrinsic brightness of the object.   Diameter - This is an estimate, based on the absolute magnitude, and assuming a uniform spherical body with visual albedo pV = Since the albedo is rarely well determined the diameter estimate should be considered quite rough, but in most cases will be accurate to within a factor of two.   Mass - This estimate assumes a uniform spherical body with the computed diameter and a mass density of 2.6 g/cm3. The mass estimate is somewhat more rough than the diameter estimate, but generally will be accurate to within a factor of three.   Energy - The kinetic energy at impact: 0.5   Mass   Vimpact2. Measured in Megatons of TNT.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}