Info

Use of open loop control 663

Yaw inversion maneuver 651

AEM (Applications Explorer Mission)— (&e also HCMM (AEM-A); SAGE (AEM-B))

Attitude system of 720,788-789

Sun sensor 157

Aerodynamic drag, effect on flexible spacecraft 551

Effect on orbit 63-65

Aerodynamic stabilization 19

Aerodynamic torque 17,573-575

AEROS (German Aeronomy Satellite)— Attitude acquisition 662

Attitude system of 788-789

Stabilization method 503

Sun sensor 157

Agena (upper stage of launch vehicle) 53

Akademfk Sergey Korolev (Soviet tracking ship) 290

Albedo 83

Of the Moon and planets, table 816

Torque due to - 571

Types of 79

Albedo sensor (See also Horizon sensor) 83 Algebraic method of three-axis attitude determination 421,424-426

Alignment, Math, model for slit sensors 219-221

Math, model for two-axis sensors 221-223 Alouette (Canadian Ionospheric Research Satellite)—

Attitude system of 788-789

Altitude of Earth satellites, table of period and Earth size vs. 828

Ambiguous attitude solutions, methods for resolution of 371-373

American Ephemera and Nautical

Almanac 36, 139-140

Analog Sun sensors 156-159

Analog-to-digltal conversion (A/D) 279,298 For magnetometers 250

Analysis of variance 429

Angle of attack (in aerodynamic torque) 574 ANGLED (subroutine) 690

Angstrom 808

Angular measure, units and conversion factois 810

Angular momentum 516-521

Orbital 40

Storage in flywheel (See Momentum wheels) Units and conversion factors 811

' Angular momentum axis, of spacecraft 487 Angular momentum control, with spin plane magnetic coils 644,646-649

Angular momentum sphere 499-501

Angular separation, between two points 727 Angular separation match, for star _ identification 259,262-263

Angular velocity, math, model for gyroscope measurement of 267-268

Units and conversion factors 811

Angular velocity vector, for Earth-

referenced spacecraft 609

Annular eclipse 72,76

Anomalistic period, for Earth satellite 67

Anomalistic year 48

Anomaly (orbit parameter) 44-46

ANS (Netherlands Astronomy Satellite)—

Attitude system of 788-789

Antennas, Examples of tracking and command 286-289

Telemetry and command 284-288

Anttpolnt, on celest>ai sphere 22

Antfeolar point 22

Antisymmetric matrix 750

Aphelion 44

Apofocal distance 44

Apofocus 44

Apogee 44

Apogee height 44

Maneuvers to change - 39

Apollo 53

Visual magnitude of during trip to Moon 79 Apollo 15 subsatelllte, nutation of 495-497 Apolune 44

Apparent solar time 798,800

Apsides 44

Rotation of (See Perigee, rotation of) Arc, of great circle 23

Arc length, measurement of on global geometry plot 742

Arc length distance, between two points 727 Arc length measurement 23,346-349

Notation for 23

Singularity conditions 406-407

Use in deterministic attitude solutions

364-365, 368-370 Arc length uncertainty, of single-axis attitude solutions 372, 374-383

Arc minute 24

Arc second 24

Area on celestial sphere, formulas for 729-730 Area] velocity 46,47

Argument of perigee 45-46

Argument of perihelion 49

Attitude system of 788-789

Aryabhata (Indian satellite)— Attitude system of 788-789

Nutation damper 628

Ascending node 44

Maneuver to change 59

Aspects of the planets (See Planetary configurations) Asteroids, Lagrange point orbits 55

Astrodynamks 487

Astronauts, disturbance torques due to motion of 576, 578-580

Astronomical constants 827-828

Astronomical Ephemera 36,139

Astronomical latitude and longitude 820

Astronomical symbols 50

Astronomical Unit 41,808

Atmosphere (unit of pressure) Atmosphere of Earth (See Earth,

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