Satellite: Pos Vel Projected Covariance: ICRF

International Celestial Reference Frame. The ICRF is the best realization of an inertial frame constructed to date, and thus represents an improvement upon the theory behind the J2000 frame. While the ICRF and J2000 frames themselves are very close, they are not identical; moreover, the J2000 frame rotates (very slowly) over time with respect to the ICRF frame.

Name Dimension Type Description
Time DateFormat Real Number Time.
Sigma X DistanceUnit Real Number Square root of the first diagonal component of the covariance matrix.
Sigma Y DistanceUnit Real Number Square root of the second diagonal component of the covariance matrix.
Sigma Z DistanceUnit Real Number Square root of the third diagonal component of the covariance matrix.
Sigma Xd Rate Real Number Square root of the fourth diagonal component of the covariance matrix.
Sigma Yd Rate Real Number Square root of the fifth diagonal component of the covariance matrix.
Sigma Zd Rate Real Number Square root of the sixth diagonal component of the covariance matrix.
Correlation XY Unitless Real Number XY correlation coefficient of the covariance matrix.
Correlation XZ Unitless Real Number XZ correlation coefficient of the covariance matrix.
Correlation XXd Unitless Real Number XXd correlation coefficient of the covariance matrix.
Correlation XYd Unitless Real Number XYd correlation coefficient of the covariance matrix.
Correlation XZd Unitless Real Number XZd correlation coefficient of the covariance matrix.
Correlation YZ Unitless Real Number YZ correlation coefficient of the covariance matrix.
Correlation YXd Unitless Real Number YXd correlation coefficient of the covariance matrix.
Correlation YYd Unitless Real Number YYd correlation coefficient of the covariance matrix.
Correlation YZd Unitless Real Number YZd correlation coefficient of the covariance matrix.
Correlation ZXd Unitless Real Number ZXd correlation coefficient of the covariance matrix.
Correlation ZYd Unitless Real Number ZYd correlation coefficient of the covariance matrix.
Correlation ZZd Unitless Real Number ZZd correlation coefficient of the covariance matrix.
Correlation XdYd Unitless Real Number XdYd correlation coefficient of the covariance matrix.
Correlation XdZd Unitless Real Number XdZd correlation coefficient of the covariance matrix.
Correlation YdZd Unitless Real Number YdZd correlation coefficient of the covariance matrix.

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