# LOWER ATMOSPHERE STATE PROPERTIES
# FROM THE PIONEER VENUS NORTH PROBE
#
# BASED ON MERGED DATA FROM P A AND P B PRESSURE SENSORS,  T 1 AND T 2 TEMPERATURE SENSORS.
# DATA ARE LISTED AT 8 SEC INTERVALS IN UPPER DESCENT AND 16 SEC INTERVALS IN
# LOWER DESCENT UNTIL T SENSOR BREAKDOWN, AND THEREAFTER AT 32 SEC INTERVALS.
# T DATA EXTRAPOLATED BEYOND 640 K, GRT 69956 SEC, 12.4 KM ALTITUDE.
# LOWER DESCENT BEGINS AT GRT 68940 SEC, 27.0 KM ALTITUDE
# G0 IS GROUND LEVEL ACCELERATION DUE TO GRAVITY, AT THE LANDING SITE.
# R0 IS PLANETARY RADIUS AT THE LANDING SITE PLUS OR MINUS 0.25 KM.
# MW IS ATMOSPHERIC MEAN MOLECULAR WEIGHT (INPUT)
# ZETA IS REAL GAS COMPRESSIBILITY FACTOR = P/(RHO X R T)
# ESTIMATED ABSOLUTE ACCURACIES: ON P, RHO........0.5% OF READING
#                                ON T.............1 K
#                                ON ALTITUDE......0.4% OF READING
# GRT (HR:MIN) IS CORRECT TO NEAREST .06 SEC. GRT (SEC) IS ROUNDED TO NEAREST SEC. IN DESCENT
# PROBE VELOCITY IN DESCENT RANGES FROM 120 M/S TO 8.5 M/S AT TOUCHDOWN
#
# LOWER ATMOSPHERE STATE PROPERTIES
# FROM THE PIONEER VENUS NORTH PROBE
# A. SEIFF, P.I.
# R0 = 6053.0 KM
# G0 = 8.8665 M/SEC2
# MW = 43.44
# TOUCHDOWN ELEVATION = +0.98 KM RELATIVE TO THE SOUNDER PROBE LANDING SITE
# ALTITUDES THAT FOLLOW ARE RELATIVE TO THE SOUNDER PROBE LANDING SITE
# GRT(HR:MIN),GRT(SEC),ALT(KM),P(BARS),T(DEG K),RHO(KG/M3),ZETA