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Table: DV Estimates in J2000 (x,y,z) Coordinates for TCM-7 Yaw Turns (mm/s)
 

OD Estimate

Nominal

Difference

1-s Uncertainty

Yaw Wind (-110.1°)

(5.3, -5.9, -1.3)

(5.0, -5.4, -1.1)

(+0.3, -0.5, -0.2)

(0.8, 0.8, 0.9)

Yaw Unwind (+110.1°)

(5.5, -6.2, -1.5)

(5.0, -5.4, -1.1)

(+0.5, -0.8, -0.4)

(0.8, 0.8, 0.9)

 

Estimated DV values for the yaw turns are in good agreement with predictions. The roll turn DVs were not estimated since there was no discernable signature in the Doppler data for those events; this is expected as the y-thrusters are coupled and impart negligible residual DVs during the roll turns.

The estimates and 1-s formal uncertainties of the TCM-7 burn parameters are given in the following table, along with their nominal values:

 

Table: Estimated TCM-7 Burn Parameters in J2000 Coordinates

OD Estimate

Nominal

Difference

1-s Uncertainty

Magnitude

224.64 mm/s

230.05 mm/s

-5.41 mm/s (-2.35%)

0.28 mm/s

Right Ascension

256.213°

255.415°

+0.798°

0.232°

Declination

-9.619°

-8.534°

-1.085°

0.494°

Start Time (UTC)

18-May-1999

17:00:06.414

18-May-1999

17:00:00.000

+6.414 sec

0.436 sec

Duration

330.009 sec

336.972 sec

-6.963 sec

0.712 sec

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