# LOWER ATMOSPHERE STATE PROPERTIES
# FROM THE PIONEER VENUS NIGHT 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 633 K, GRT 70261 SEC, 14.4 KM ALTITUDE.
# LOWER DESCENT BEGINS AT GRT 69333 SEC, 28.4 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 0.06 SEC. GRT (SEC) IS ROUNDED TO NEAREST SEC. IN DESCENT
# PROBE VELOCITY IN DESCENT RANGES FROM 234 M/S TO 8.2 M/S AT TOUCHDOWN.
#
# LOWER ATMOSPHERE STATE PROPERTIES
# FROM THE PIONEER VENUS NIGHT PROBE
# A. SEIFF, P.I.
# R0 = 6051.4 KM
# G0 = 8.8712 M/SEC2
# MW = 43.44
# TOUCHDOWN ELEVATION = -0.65 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),ZET