******************************************************************************* 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 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon Jun 7 17:40:57 2021 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. 2021-Jun-06 00:00:00.0000 UT Stop time : A.D. 2031-Jun-06 00:00:00.0000 UT Step-size : 144000 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 : DEG Time format : CAL EOP file : eop.210607.p210829 EOP coverage : DATA-BASED 1962-JAN-20 TO 2021-JUN-07. PREDICTS-> 2021-AUG-28 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 GlxLon GlxLat ************************************************************************ $$SOE 2021-Jun-06 00:00 118.566847915 22.211104403 198.933028 23.289531 2021-Sep-14 00:00 179.460388583 1.132409175 274.374209 60.998069 2021-Dec-23 00:00 244.563305267 -21.413992393 354.101960 20.307926 2022-Apr-02 00:00 322.590262303 -16.044847410 35.571948 -42.275584 2022-Jul-11 00:00 32.073866446 11.054298322 151.496925 -47.510245 2022-Oct-19 00:00 83.869146055 23.274039399 183.607557 -4.923467 2023-Jan-27 00:00 66.843141681 24.520595221 173.125301 -16.668890 2023-May-07 00:00 114.056178260 23.324729906 196.182404 19.828508 2023-Aug-15 00:00 172.679714471 4.026650007 259.565630 59.917319 2023-Nov-23 00:00 236.388615805 -20.017107803 349.373378 26.761291 2024-Mar-02 00:00 316.146632670 -17.833448383 30.458189 -37.198328 2024-Jun-10 00:00 28.563194506 10.514182562 147.060586 -49.394021 2024-Sep-18 00:00 98.061101117 23.467813695 189.856433 6.504551 2024-Dec-27 00:00 126.292537681 23.089579095 200.752570 30.295690 2025-Apr-06 00:00 117.391871911 23.635010379 197.069934 22.793616 2025-Jul-15 00:00 167.105542857 6.424752600 248.473397 57.947436 2025-Oct-23 00:00 228.217901756 -18.228869561 343.958754 33.149589 2026-Jan-31 00:00 308.219532014 -19.879331502 24.958547 -30.894154 2026-May-11 00:00 22.180577944 8.420084510 138.484061 -53.324518 2026-Aug-19 00:00 95.087481978 23.696898182 188.394617 4.186294 2026-Nov-27 00:00 152.909698233 13.527028464 224.844188 50.354204 2027-Mar-07 00:00 148.443621253 17.225447781 217.004698 47.924844 2027-Jun-15 00:00 165.079907719 7.411968619 244.612558 57.103695 2027-Sep-23 00:00 220.976998429 -16.402241920 338.288224 38.630194 2028-Jan-01 00:00 299.825882102 -21.738954311 19.872388 -24.208028 2028-Apr-10 00:00 14.976201482 5.694960906 126.803663 -57.115466 2028-Jul-19 00:00 88.200862010 23.848565252 185.187671 -1.243477 2028-Oct-27 00:00 153.876096071 12.453763483 227.018653 50.700768 2029-Feb-04 00:00 193.044813698 -2.240883945 303.314981 60.628887 2029-May-15 00:00 175.959422166 3.187167029 266.006146 61.115095 2029-Aug-23 00:00 216.238785781 -15.313829176 333.859716 41.874674 2029-Dec-01 00:00 291.949984728 -23.224202129 15.507996 -17.996925 2030-Mar-11 00:00 7.756649379 2.762504099 112.777639 -59.707976 2030-Jun-19 00:00 80.123314456 23.639756188 181.401480 -7.605211 2030-Sep-27 00:00 148.899439607 13.964526548 221.683298 47.029215 2031-Jan-05 00:00 202.984573551 -7.712225027 320.087835 53.805367 2031-Apr-15 00:00 227.289966998 -16.361786973 344.510469 35.158103 $$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 decimal degrees, ddd.fffff{ffff} DEC in decimal degrees, sdd.fffff{ffff} 'GlxLon GlxLat' = Observer-centered Galactic System II (post WW II) longitude and latitude of the target centers' apparent position, with light-time, gravitational deflection of light, and stellar aberrations. 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 *******************************************************************************