*******************************************************************************
 Revised: June 21, 2016                 Mars                            499 / 4

 PHYSICAL DATA (updated 2019-Oct-29):
  Vol. mean radius (km) = 3389.92+-0.04   Density (g/cm^3)      =  3.933(5+-4)
  Mass x10^23 (kg)      =    6.4171       Flattening, f         =  1/169.779
  Volume (x10^10 km^3)  =   16.318        Equatorial radius (km)=  3396.19
  Sidereal rot. period  =   24.622962 hr  Sid. rot. rate, rad/s =  0.0000708822
  Mean solar day (sol)  =   88775.24415 s Polar gravity m/s^2   =  3.758
  Core radius (km)      = ~1700           Equ. gravity  m/s^2   =  3.71
  Geometric Albedo      =    0.150

  GM (km^3/s^2)         = 42828.375214    Mass ratio (Sun/Mars) = 3098703.59
  GM 1-sigma (km^3/s^2) = +- 0.00028      Mass of atmosphere, kg= ~ 2.5 x 10^16
  Mean temperature (K)  =  210            Atmos. pressure (bar) =    0.0056
  Obliquity to orbit    =   25.19 deg     Max. angular diam.    =  17.9"
  Mean sidereal orb per =    1.88081578 y Visual mag. V(1,0)    =  -1.52
  Mean sidereal orb per =  686.98 d       Orbital speed,  km/s  =  24.13
  Hill's sphere rad. Rp =  319.8          Escape speed, km/s    =   5.027
                                 Perihelion  Aphelion    Mean
  Solar Constant (W/m^2)         717         493         589
  Maximum Planetary IR (W/m^2)   470         315         390
  Minimum Planetary IR (W/m^2)    30          30          30
*******************************************************************************




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Ephemeris / WWW_USER Tue Sep  8 07:58:04 2020 Pasadena, USA      / Horizons
*******************************************************************************
Target body name: Mars (499)                      {source: mar097}
Center body name: Earth (399)                     {source: mar097}
Center-site name: GEOCENTRIC
*******************************************************************************
Start time      : A.D. 2020-Sep-08 00:00:00.0000 UT
Stop  time      : A.D. 2020-Oct-08 00:00:00.0000 UT
Step-size       : 1440 minutes
*******************************************************************************
Target pole/equ : IAU_MARS                        {West-longitude positive}
Target radii    : 3396.2 x 3396.2 x 3376.2 km     {Equator, meridian, pole}
Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : High-precision EOP model        {East-longitude positive}
Center radii    : 6378.1 x 6378.1 x 6356.8 km     {Equator, meridian, pole}
Target primary  : Sun
Vis. interferer : MOON (R_eq= 1737.400) km        {source: mar097}
Rel. light bend : Sun, EARTH                      {source: mar097}
Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format       : HMS
Time format     : CAL
EOP file        : eop.200904.p201126
EOP coverage    : DATA-BASED 1962-JAN-20 TO 2020-SEP-04. PREDICTS-> 2020-NOV-25
Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar elongation (  0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
Table cut-offs 3: RA/DEC angular rate (     0.0=NO )
****************************************************************************************************************
 Date__(UT)__HR:MN     R.A._____(ICRF)_____DEC   APmag   S-brt            delta      deldot    S-O-T /r    S-T-O
****************************************************************************************************************
$$SOE
 2020-Sep-08 00:00     01 49 28.77 +06 43 43.8  -1.971   4.194 0.46952793693765  -5.9857519 137.5163 /L  29.3023
 2020-Sep-09 00:00     01 49 32.98 +06 44 29.8  -2.002   4.182 0.46611159837859  -5.8444871 138.4610 /L  28.7015
 2020-Sep-10 00:00     01 49 33.78 +06 45 01.7  -2.040   4.162 0.46277820312601  -5.6984724 139.4207 /L  28.0866
 2020-Sep-11 00:00     01 49 31.14 +06 45 19.4  -2.072   4.148 0.45953055063547  -5.5475133 140.3956 /L  27.4577
 2020-Sep-12 00:00     01 49 25.05 +06 45 23.1  -2.099   4.140 0.45637155219742  -5.3914172 141.3856 /L  26.8146
 2020-Sep-13 00:00     01 49 15.49 +06 45 12.8  -2.112   4.144 0.45330422893377  -5.2299976 142.3908 /L  26.1573
 2020-Sep-14 00:00     01 49 02.46 +06 44 48.6  -2.133   4.140 0.45033170583641  -5.0630836 143.4113 /L  25.4859
 2020-Sep-15 00:00     01 48 45.96 +06 44 10.7  -2.144   4.145 0.44745719813726  -4.8905370 144.4468 /L  24.8004
 2020-Sep-16 00:00     01 48 26.02 +06 43 19.2  -2.166   4.140 0.44468398611775  -4.7122749 145.4974 /L  24.1009
 2020-Sep-17 00:00     01 48 02.64 +06 42 14.6  -2.184   4.138 0.44201537626493  -4.5282930 146.5628 /L  23.3875
 2020-Sep-18 00:00     01 47 35.87 +06 40 57.0  -2.201   4.137 0.43945465112138  -4.3386795 147.6429 /L  22.6605
 2020-Sep-19 00:00     01 47 05.75 +06 39 26.7  -2.219   4.133 0.43700501610956  -4.1436105 148.7374 /L  21.9201
 2020-Sep-20 00:00     01 46 32.35 +06 37 44.3  -2.236   4.131 0.43466955556327  -3.9433235 149.8459 /L  21.1666
 2020-Sep-21 00:00     01 45 55.72 +06 35 50.1  -2.245   4.136 0.43245120856057  -3.7380771 150.9682 /L  20.4003
 2020-Sep-22 00:00     01 45 15.95 +06 33 44.7  -2.252   4.141 0.43035276792797  -3.5281138 152.1036 /L  19.6217
 2020-Sep-23 00:00     01 44 33.12 +06 31 28.5  -2.272   4.134 0.42837689742046  -3.3136358 153.2520 /L  18.8312
 2020-Sep-24 00:00     01 43 47.30 +06 29 01.9  -2.296   4.122 0.42652615755415  -3.0947986 154.4127 /L  18.0291
 2020-Sep-25 00:00     01 42 58.61 +06 26 25.7  -2.318   4.111 0.42480303123358  -2.8717172 155.5852 /L  17.2161
 2020-Sep-26 00:00     01 42 07.13 +06 23 40.2  -2.343   4.097 0.42320994395582  -2.6444776 156.7690 /L  16.3927
 2020-Sep-27 00:00     01 41 12.97 +06 20 46.0  -2.361   4.088 0.42174927709785  -2.4131484 157.9634 /L  15.5594
 2020-Sep-28 00:00     01 40 16.26 +06 17 43.8  -2.374   4.085 0.42042337508501  -2.1777902 159.1678 /L  14.7169
 2020-Sep-29 00:00     01 39 17.09 +06 14 34.2  -2.366   4.100 0.41923454802078  -1.9384622 160.3814 /L  13.8658
 2020-Sep-30 00:00     01 38 15.61 +06 11 17.6  -2.388   4.085 0.41818507119621  -1.6952265 161.6033 /L  13.0071
 2020-Oct-01 00:00     01 37 11.95 +06 07 54.9  -2.413   4.067 0.41727718237934  -1.4481517 162.8326 /L  12.1416
 2020-Oct-02 00:00     01 36 06.24 +06 04 26.6  -2.423   4.063 0.41651307729612  -1.1973152 164.0681 /L  11.2702
 2020-Oct-03 00:00     01 34 58.64 +06 00 53.4  -2.419   4.072 0.41589490343749  -0.9428071 165.3084 /L  10.3943
 2020-Oct-04 00:00     01 33 49.29 +05 57 16.1  -2.436   4.059 0.41542475229821  -0.6847317 166.5517 /L   9.5151
 2020-Oct-05 00:00     01 32 38.35 +05 53 35.3  -2.468   4.030 0.41510465030449  -0.4232102 167.7960 /L   8.6344
 2020-Oct-06 00:00     01 31 26.00 +05 49 51.9  -2.491   4.008 0.41493654889816  -0.1583813 169.0384 /L   7.7546
 2020-Oct-07 00:00     01 30 12.41 +05 46 06.6  -2.518   3.983 0.41492231438136   0.1095989 170.2748 /L   6.8785
 2020-Oct-08 00:00     01 28 57.75 +05 42 20.3  -2.544   3.957 0.41506371808352   0.3805578 171.4994 /L   6.0107
$$EOE
****************************************************************************************************************
Column meaning:

TIME

  Times PRIOR to 1962 are UT1, a mean-solar time closely related to the
prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current
civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1
using integer leap-seconds for 1972 and later years.

  Conversion from the internal Barycentric Dynamical Time (TDB) of solar
system dynamics to the non-uniform civil UT time-scale requested for output
has not been determined for UTC times after the next July or January 1st.
Therefore, the last known leap-second is used as a constant over future
intervals.

  Time tags refer to the UT time-scale conversion from TDB on Earth
regardless of observer location within the solar system, although clock
rates may differ due to the local gravity field and no analog to "UT"
may be defined for that location.

  Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank
(" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the
Julian calendar system. Later calendar dates are in the Gregorian system.

  NOTE: "n.a." in output means quantity "not available" at the print-time.

 'R.A._____(ICRF)_____DEC' =
  Astrometric right ascension and declination of the target center with
respect to the observing site (coordinate origin) in the reference frame of
the planetary ephemeris (ICRF). Compensated for down-leg light-time delay
aberration.

  Units: RA  in hours-minutes-seconds of time,    HH MM SS.ff{ffff}
         DEC in degrees-minutes-seconds of arc,  sDD MN SC.f{ffff}

 'APmag   S-brt' =
  The targets' approximate apparent visual magnitude and surface brightness.
For planets and natural satellites, output is restricted to solar phase angles
covered by observational data. Outside the observed phase angle range, "n.a."
may be output to avoid extrapolation beyond the limit of model validity.

   For Earth-based observers, the estimated dimming due to atmospheric
absorption (extinction) is available as a separate, requestable quantity.

   Surface brightness is the average airless visual magnitude of a
square-arcsecond of the illuminated portion of the apparent disk. It is
computed only if the target radius is known.

   Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND

 'delta      deldot' =
   Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot")
of the target center relative to the observer. A positive "deldot" means the
target center is moving away from the observer, negative indicates movement
toward the observer.  Units: AU and KM/S

 'S-O-T /r' =
   Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers'
location at print-time.

   The '/r' column provides a code indicating the targets' apparent position
relative to the Sun in the observers' sky, as described below:

   Case A: For an observing location on the surface of a rotating body, that
body rotational sense is considered:

    /T indicates target TRAILS Sun   (evening sky: rises and sets AFTER Sun)
    /L indicates target LEADS Sun    (morning sky: rises and sets BEFORE Sun)

   Case B: For an observing point that does not have a rotational model (such
as a spacecraft), the "leading" and "trailing" condition is defined by the
observers' heliocentric ORBITAL motion:

    * If continuing in the observers' current direction of heliocentric
       motion would encounter the targets' apparent longitude first, followed
       by the Sun's, the target LEADS the Sun as seen by the observer.

    * If the Sun's apparent longitude would be encountered first, followed
       by the targets', the target TRAILS the Sun.

   Two other codes can be output:
    /* indicates observer is Sun-centered    (undefined)
    /? Target is aligned with Sun center     (no lead or trail)

   The S-O-T solar elongation angle is numerically the minimum separation
angle of the Sun and target in the sky in any direction. It does NOT indicate
the amount of separation in the leading or trailing directions, which would
be defined along the equator of a spherical coordinate system.

   Units: DEGREES

 'S-T-O' =
   The Sun-Target-Observer angle; the interior vertex angle at target center
formed by a vector from the target to the apparent center of the Sun (at
reflection time on the target) and the apparent vector from target to the
observer at print-time. Slightly different from true PHASE ANGLE (requestable
separately) at the few arcsecond level in that it includes stellar aberration
on the down-leg from target to observer.  Units: DEGREES


 Computations by ...
     Solar System Dynamics Group, Horizons On-Line Ephemeris System
     4800 Oak Grove Drive, Jet Propulsion Laboratory
     Pasadena, CA  91109   USA
     Information  : https://ssd.jpl.nasa.gov/
     Documentation: https://ssd.jpl.nasa.gov/?horizons_doc
     Connect      : https://ssd.jpl.nasa.gov/?horizons (browser)
                    telnet ssd.jpl.nasa.gov 6775       (command-line)
                    e-mail command interface available
                    Script and CGI interfaces available
     Author       : Jon.D.Giorgini@jpl.nasa.gov

****************************************************************************************************************
