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31e7511f89
I added this test, but unfortunately I could not figure out how to make JPL Horizons generate equatorial and galactic coordinates using the same aberration model. This appears to introduce an extra 22 arcseconds of error.
154 lines
8.8 KiB
Plaintext
154 lines
8.8 KiB
Plaintext
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Revised: June 21, 2016 Mars 499 / 4
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PHYSICAL DATA (updated 2019-Oct-29):
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Vol. mean radius (km) = 3389.92+-0.04 Density (g/cm^3) = 3.933(5+-4)
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Mass x10^23 (kg) = 6.4171 Flattening, f = 1/169.779
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Volume (x10^10 km^3) = 16.318 Equatorial radius (km)= 3396.19
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Sidereal rot. period = 24.622962 hr Sid. rot. rate, rad/s = 0.0000708822
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Mean solar day (sol) = 88775.24415 s Polar gravity m/s^2 = 3.758
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Core radius (km) = ~1700 Equ. gravity m/s^2 = 3.71
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Geometric Albedo = 0.150
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GM (km^3/s^2) = 42828.375214 Mass ratio (Sun/Mars) = 3098703.59
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GM 1-sigma (km^3/s^2) = +- 0.00028 Mass of atmosphere, kg= ~ 2.5 x 10^16
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Mean temperature (K) = 210 Atmos. pressure (bar) = 0.0056
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Obliquity to orbit = 25.19 deg Max. angular diam. = 17.9"
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Mean sidereal orb per = 1.88081578 y Visual mag. V(1,0) = -1.52
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Mean sidereal orb per = 686.98 d Orbital speed, km/s = 24.13
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Hill's sphere rad. Rp = 319.8 Escape speed, km/s = 5.027
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Perihelion Aphelion Mean
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Solar Constant (W/m^2) 717 493 589
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Maximum Planetary IR (W/m^2) 470 315 390
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Minimum Planetary IR (W/m^2) 30 30 30
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*******************************************************************************
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*******************************************************************************
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Ephemeris / WWW_USER Mon Jun 7 17:40:57 2021 Pasadena, USA / Horizons
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*******************************************************************************
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Target body name: Mars (499) {source: mar097}
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Center body name: Earth (399) {source: mar097}
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Center-site name: GEOCENTRIC
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*******************************************************************************
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Start time : A.D. 2021-Jun-06 00:00:00.0000 UT
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Stop time : A.D. 2031-Jun-06 00:00:00.0000 UT
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Step-size : 144000 minutes
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*******************************************************************************
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Target pole/equ : IAU_MARS {West-longitude positive}
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Target radii : 3396.2 x 3396.2 x 3376.2 km {Equator, meridian, pole}
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Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)}
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Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)}
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Center pole/equ : High-precision EOP model {East-longitude positive}
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Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole}
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Target primary : Sun
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Vis. interferer : MOON (R_eq= 1737.400) km {source: mar097}
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Rel. light bend : Sun, EARTH {source: mar097}
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Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2
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Atmos refraction: NO (AIRLESS)
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RA format : DEG
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Time format : CAL
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EOP file : eop.210607.p210829
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EOP coverage : DATA-BASED 1962-JAN-20 TO 2021-JUN-07. PREDICTS-> 2021-AUG-28
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Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s
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Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
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Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
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Table cut-offs 3: RA/DEC angular rate ( 0.0=NO )
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Date__(UT)__HR:MN R.A._______(ICRF)_______DEC GlxLon GlxLat
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************************************************************************
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$$SOE
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2021-Jun-06 00:00 118.566847915 22.211104403 198.933028 23.289531
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2021-Sep-14 00:00 179.460388583 1.132409175 274.374209 60.998069
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2021-Dec-23 00:00 244.563305267 -21.413992393 354.101960 20.307926
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2022-Apr-02 00:00 322.590262303 -16.044847410 35.571948 -42.275584
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2022-Jul-11 00:00 32.073866446 11.054298322 151.496925 -47.510245
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2022-Oct-19 00:00 83.869146055 23.274039399 183.607557 -4.923467
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2023-Jan-27 00:00 66.843141681 24.520595221 173.125301 -16.668890
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2023-May-07 00:00 114.056178260 23.324729906 196.182404 19.828508
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2023-Aug-15 00:00 172.679714471 4.026650007 259.565630 59.917319
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2023-Nov-23 00:00 236.388615805 -20.017107803 349.373378 26.761291
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2024-Mar-02 00:00 316.146632670 -17.833448383 30.458189 -37.198328
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2024-Jun-10 00:00 28.563194506 10.514182562 147.060586 -49.394021
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2024-Sep-18 00:00 98.061101117 23.467813695 189.856433 6.504551
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2024-Dec-27 00:00 126.292537681 23.089579095 200.752570 30.295690
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2025-Apr-06 00:00 117.391871911 23.635010379 197.069934 22.793616
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2025-Jul-15 00:00 167.105542857 6.424752600 248.473397 57.947436
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2025-Oct-23 00:00 228.217901756 -18.228869561 343.958754 33.149589
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2026-Jan-31 00:00 308.219532014 -19.879331502 24.958547 -30.894154
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2026-May-11 00:00 22.180577944 8.420084510 138.484061 -53.324518
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2026-Aug-19 00:00 95.087481978 23.696898182 188.394617 4.186294
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2026-Nov-27 00:00 152.909698233 13.527028464 224.844188 50.354204
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2027-Mar-07 00:00 148.443621253 17.225447781 217.004698 47.924844
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2027-Jun-15 00:00 165.079907719 7.411968619 244.612558 57.103695
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2027-Sep-23 00:00 220.976998429 -16.402241920 338.288224 38.630194
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2028-Jan-01 00:00 299.825882102 -21.738954311 19.872388 -24.208028
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2028-Apr-10 00:00 14.976201482 5.694960906 126.803663 -57.115466
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2028-Jul-19 00:00 88.200862010 23.848565252 185.187671 -1.243477
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2028-Oct-27 00:00 153.876096071 12.453763483 227.018653 50.700768
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2029-Feb-04 00:00 193.044813698 -2.240883945 303.314981 60.628887
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2029-May-15 00:00 175.959422166 3.187167029 266.006146 61.115095
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2029-Aug-23 00:00 216.238785781 -15.313829176 333.859716 41.874674
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2029-Dec-01 00:00 291.949984728 -23.224202129 15.507996 -17.996925
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2030-Mar-11 00:00 7.756649379 2.762504099 112.777639 -59.707976
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2030-Jun-19 00:00 80.123314456 23.639756188 181.401480 -7.605211
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2030-Sep-27 00:00 148.899439607 13.964526548 221.683298 47.029215
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2031-Jan-05 00:00 202.984573551 -7.712225027 320.087835 53.805367
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2031-Apr-15 00:00 227.289966998 -16.361786973 344.510469 35.158103
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$$EOE
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Column meaning:
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TIME
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Times PRIOR to 1962 are UT1, a mean-solar time closely related to the
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prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current
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civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1
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using integer leap-seconds for 1972 and later years.
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Conversion from the internal Barycentric Dynamical Time (TDB) of solar
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system dynamics to the non-uniform civil UT time-scale requested for output
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has not been determined for UTC times after the next July or January 1st.
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Therefore, the last known leap-second is used as a constant over future
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intervals.
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Time tags refer to the UT time-scale conversion from TDB on Earth
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regardless of observer location within the solar system, although clock
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rates may differ due to the local gravity field and no analog to "UT"
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may be defined for that location.
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Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank
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(" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the
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Julian calendar system. Later calendar dates are in the Gregorian system.
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NOTE: "n.a." in output means quantity "not available" at the print-time.
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'R.A._______(ICRF)_______DEC' =
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Astrometric right ascension and declination of the target center with
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respect to the observing site (coordinate origin) in the reference frame of
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the planetary ephemeris (ICRF). Compensated for down-leg light-time delay
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aberration.
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Units: RA in decimal degrees, ddd.fffff{ffff}
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DEC in decimal degrees, sdd.fffff{ffff}
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'GlxLon GlxLat' =
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Observer-centered Galactic System II (post WW II) longitude and latitude
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of the target centers' apparent position, with light-time, gravitational
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deflection of light, and stellar aberrations. Units: DEGREES
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Computations by ...
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Solar System Dynamics Group, Horizons On-Line Ephemeris System
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4800 Oak Grove Drive, Jet Propulsion Laboratory
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Pasadena, CA 91109 USA
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Information : https://ssd.jpl.nasa.gov/
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Documentation: https://ssd.jpl.nasa.gov/?horizons_doc
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Connect : https://ssd.jpl.nasa.gov/?horizons (browser)
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telnet ssd.jpl.nasa.gov 6775 (command-line)
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e-mail command interface available
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Script and CGI interfaces available
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Author : Jon.D.Giorgini@jpl.nasa.gov
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*******************************************************************************
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