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LORAN-C (See Long Range Navigation-C) Loss function (in estimation theory) 449-451 Loss of signal (See Out-triggering) Loxodrome (rhumb line) 653

LORAN-C (See Long Range Navigation-C) Loss function (in estimation theory) 449-451 Loss of signal (See Out-triggering) Loxodrome (rhumb line) 653

Lubrication, of spacecraft wheel bearings 202 Lunar Orbiter (spacecraft), attitude reference system 189

Lunar parallax 142-143

Lyndon B. Johnson Space Center 285

MAGFLD (subroutine) 693 Magnetic attitude control (See also

Magnetic stabilization) 18-19, 617-621

Hardware for 204-205 Maneuver strategy 639-642,644-649

Maneuvers 636-649

Magnetic coil control systems 503, 508-509

Magnetic colts 204-205

Magnetic dipole moment 204

Units and conversion factors 812,813

Magnetic disturbance torque 575-576

Magnetic equator 114 Magnetic field—

Interplanetary 130-132 Of the Earth (See Geomagnetic field) Magnetic field strength, units and conversion factors 811, 813 Magnetic flux, units and conversion factors 811

Magnetic induction field 251 Magnetic induction, units and conversion factors 811,813

Magnetic materials 205

Magnetic moment 204

Of a current distribution 252

Units and conversion factors 811,813

Magnetic nutation damping 614,629-630

Magnetic observatories 122

Magnetic permeability 813

Magnetic precession 636-649

Magnetic stabilization 671-672

List of spacecraft using 787

Magnetic storm 121

Magnetic systems of units 811-813

Magnetic torque 17 Magnetic torqtdng—

Continuous 639

List of spacecraft using 796

Quarter orbit (QUOMAC) 640

Magnetometers 180-184

Bias determination 329-330

Biases 251-254 Data—

—Curve fitting for 321

—Residual errors in 328

—Validation of 328 Example of use in attitude determination 13-14

List of spacecraft using 797

Mathematical models 249-254

On Apollo 15 subsateUite 495-496

Magnetopause 120

Magnetosheath 120

Magnetosphere 106, 120

Magnetotail 120

Magnitude (scale of brightness) 77

Instrumental 258 Moon and planets, table of 816-817, 823

Of planets, satellites, and spacecraft 77-80

Sample calculation for spacecraft 79

Stellar 144-145 MAGSAT (Magnetic Satellite)—

Attitude software structure 699

Attitude system of 792-793

Evaluation of horizon sensor data 471

Fixed-head star tracker 193-195

Need for accurate Sun sensor 166

Scanwheels horizon sensor 176-178

Star catalog for 147 Use of carbon dioxide band horizon sensor 92

Major frame 293-294 Major principal axis 500,625-626 Maneuver control (See Altitude maneuver control)

Marginal stability, of a control system 594 Mariner (spacecraft), attitude reference system 189

Mariner 10 60

Marquardt's Algorithm 455-456 Mars—

Hohmann transfer orbit to 58-59

Oppositions of 51

Mash detector (Sun sensor) 158 Mass expulsion system (See Gas jets)

Mass expulsion torques 576-577

Mass, units and conversion factors 808

Master catalog (star catalogs) 147

Master frame (telemetry) 293-294

Master station (time signals) 300

MATMPY (subroutine) 691

Matrix 744

Matrix algebra 744-757

Subroutines 691

Matrix functions 754-755

Matrix inversion 749-750

Subroutine (INVERT) 691 Matrix multiplication subroutine

(MATMPY) 691

Matrix notation x

Matrix Riccati equation 465

Matrix transformations 751-752

Mean (of a random variable) 429

Mean angular motion 47, 67

for Earth satellite 67

Mean anomaly 45-46

Rate of change of 67

Mean distance, in an elliptical orbit 38

Mean free path, in atmosphere 108-109

Mean of date coordinates 28

Mean orbital elements 46 Mean sea level (See also Geoid; geoid height) 98. 99

Mean Solar Time 798,801,80S

Mean Son 801

Measurement, as used in state estimation 444 Measurement covariance matrix 461

Measurement density (See Attitude measurement density) Measurement uncertainty (See Attitude determination accuracy; Uncertainty) Mercator, Gerhardus 653

Mcreator representation 653

Mercury (planet), relativistic rotation of perhelion 63

Mercury program, use of horizon sensors 167, 168

Meridian 24

Mesopanse 106

Mesosphere 107

Message vector (in a Hamming code) 296 Metre, definition 807

Metric conversion factors 807-813

Micro meteorites, torque due to 17

Minicomputers, use in attitude software system 699

Minor, of a matrix 748

Minor frame 293

Minor frame counter (minor frame ID)

0 0

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