CCSDS 508.0-R-1, Conjunction Data Message (Red Book, Issue 1 ...

DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESTRACKS_USED: The number of sensor tracks, for the recommended time span, that wereaccepted for the OD. This provides information about the independence of the observationaldata used in the OD.MAXIMUM_OBS_GAP: The maximum time between observations in the OD of the object.WEIGHTED_RMS:WhereWeighted RMS Ni1y i is the observation measurement at the ith time;yˆiis the current estimate of y i ; ˆ 2w y yi i i1wi is the weight (sigma) associated with the measurement at the ith time; and2iNN is the number of observations.This is a value that can generally identify the quality of the most recent vector update, and isused by the analyst in evaluating the OD process. A value of 1.00 is ideal.C4MODEL PARAMETERSGRAVITY_MODEL: The geopotential model used in the state vector update. The degree(D) and order (O) of the spherical harmonic coefficients applied should be given along withthe name of the model.ATMOSPHERIC_MODEL: The atmospheric drag model used in the state vector update.N_BODY_PERTURBATIONS: Which (if any) N-body gravitational perturbations wereincluded in the state vector update. The value is a comma-separated list of the body names.SOLAR_RAD_PRESSURE: Whether perturbations due to solar radiation pressure wereincluded in the state vector update.EARTH_TIDES: Whether perturbations due to solid earth and ocean tides were included inthe state vector update.CCSDS 508.0-R-1 Page C-4 March 2012