Info

Kinematic equation* of motion for 512

Parameterizalions 410-420

Summary of properties 761-762

Table of as function of Euler angles 764

Directrix 40 Discretization error, in integration procedures 560 Distnrbance torques (See also Specific torques, f.g, Aerodynamic) 502

As control system inputs 589

Distinguished from control torques 498

Due to engine misalignments 580-583

Due to orbit maneuvers 580-583

Environmental 566-576

—Frequencies of 318

Internal 576-580

Mathematical models of 558-587

Table of 17 Treatment of for attitude propagation 558 Divergence—

In Kalman filters 467-468

Of a vector function 756 DODGE (Department of Defense Gravity Experiment Satellite)—

Attitude system of 788-789

Dot product, of vectors 747

Double stars, in star catalogs 145-146

Downlink 278

Draconic month 52

Drag, on spacecraft orbits 64

Drag coefficient 64. 574 Drift—.

In gyroscopes 200

Of spacecraft attitude 498

Drift rate ratnp, in gyroscopes . 200 DSCS (Defense Satellite Communications System)—

Shadow modeling for 573

Dual-flake horizon sensors 171 Dual-scanner single-axis attitude solutions 368 Dual-spin spacecraft 202-203. 601 Attitude acquisition via momentum transfer 667-669

Nutation of 536-539

Pitch control 617

Stabilization by 503-505

Dumbbell, rotation of 487-488 Duty Cycle-

Horizon sensor output 172

Of reaction wheel command 270

Dynamic equations of motion 521 -523

For flexible spacecraft 552-555

Torque free 524-529

Dynamics (See Altitude dynamics) Definition 487

e (Base of natural logarithms), value 826 Earth (See also Nadir)

Albedo of 83

Appearance from space 83-106

—Due to oblateness 99-103 Appearance of horizon at 14 to 16

microns 92-98 As attitude determination reference source 17

Atmosphere of 106-110

—Composition 108

—Effect of during eclipses 77

—Horizontal temperature gradients 94-96

—Models 109-110

—Structure 106-109

—Table of properties 820

—Variation in structure 109

—Vertical temperature cross section 96

Bias in sensed angular radius 235

—Procedure to measure 483

Dark angle 88 Geocentric and geodetic coordinates

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