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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