Info

Names (See Spacecraft, names) Orbit of 52-62

—Lifetime 64

—Period around Earth or Sun vs.

semimajor axis 808

—Period vs. altitude above Earth, table 828 —Potential artificial satellites of planets 825 —Properties 825

—Utility subroutines for 692-693

Satellite Automatic Tracking Antennas 284 Satellite Command Antenna 284,289

Satellite tracking stations (See Tracking

Satellites, natural, table of properties 817 Saturation Omit, of momentum wheel 508 Saturn V launch vehicle 3

Scalar checking, for data validation 328-334 Scalar product, of vectors 747

SCALE (subroutine) 694

Scale height, of atmosphere 108

Scaliger, Joseph 20

SCAMA (See Switching, Conferencing, and Monitoring Arrangement) Scanning mechanism, employed by horizon sensor 169

Scanwheels horizon sensor 169,176-178

Scbmidt normalization, for spherical harmonics 780

Seine (numerical measure of star identification) 260

Scout launch v ehicle 3

Search coil magnetometer 181

Search pattern (in fixed head star trackers) 189 SEASAT (ocean studies satellite)— Anticipated horizon radiance variations 98 Attitude system of 794-795

Canted momentum wheels 602-603

Clock 299

Control system description 612-613,621-622 Effect of flexibility on attitude dynamics 556 Locator used on horizon sensor 172

Momentum wheel 202

Scanwheels horizon sensor 170,176-178

Sun sensor 157, 166

—Coverage of 402

Use of carbon dioxide band horizon sensor 92

Second (ephemeris) 799

Second (SI unit) 802

Definition 807

Secondary (one of two objects in an orbit) 38 Sectoral harmonic coefficients, explanation of 777-778

Secular drift, geomagnetic field 113

Secular terms, geomagnetic field model 779 Selenocentric coordinates 29

Self-correcting codes 296-297

Semiconjugate axis of hyperbola 40

Semimajor axis 38, 46

Semlmlnor axis 38

Semltransverse axis, of hyperbola 40

Sensor electronics, mathematical models

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