KBE3D / KBSatellite / _tlejs / getFirstTimeDerivative

函数: getFirstTimeDerivative()

getFirstTimeDerivative(tle: TLE, isTLEParsed?: boolean): number

First Time Derivative of the Mean Motion divided by two, measured in orbits per day per day (orbits/day ^ 2). Defines how mean motion changes from day to day, so TLE propagators can still be used to make reasonable guesses when distant from the original TLE epoch. Can be a negative or positive number. Aka mean motion dot. See https://en.wikipedia.org/wiki/Mean_Motion

参数

tle

TLE

Input TLE.

isTLEParsed?

boolean

Bypasses TLE parsing when true.

返回

number

示例

getFirstTimeDerivative('1 25544U 98067A   17206.18396726 ...');
0.00001961