******************************************************************************* Revised: Apr 03, 2024 134340 Pluto 999 Pre-computed solution PLU060/DE440. Fit to post New Horizons encounter and Gaia data through 2023. For discussion, see ... M. Brozovic, R. A. Jacobson (2024) "Post-New Horizons orbits and masses for the satellites of Pluto". AJ (in press) PHYSICAL DATA (updated 2021-Jun-07; Mc= Charon mass, radius is IAU 2015): Mass x10^22 (kg) = 1.307+-0.018 Volume, 10^10 km^3 = 0.697 GM (planet) km^3/s^2 = 869.326 Density (R=1195 km) = 1.86 g/cm^3 GM 1-sigma, km^3/s^2 = 0.4 Surface gravity = 0.611 m/s^2 Vol. mean radius (km) = 1188.3+-1.6 Mass ratio (Mc/Mp) = 0.122 Sidereal rot. period = 153.29335198 h Sid. rot. rat, rad/s = 0.0000113856 Mean solar day, h = 153.2820 Mean orbit velocity = 4.67 km/s Sidereal orbit period = 249.58932 yr Escape speed, km/s = 1.21 Perihelion Aphelion Mean Solar Constant (W/m^2) 1.56 0.56 0.88 Maximum Planetary IR (W/m^2) 0.8 0.3 0.5 Minimum Planetary IR (W/m^2) 0.8 0.3 0.5 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 25 21:15:44 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Pluto (999) {source: plu060_merged} Center body name: Sun (10) {source: plu060_merged} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2020-Jan-01 00:00:00.0000 UT Stop time : A.D. 2020-Feb-01 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : IAU_PLUTO {East-longitude positive} Target radii : 1188.3, 1188.3, 1188.3 km {Equator_a, b, pole_c} Center geodetic : 0.0, 0.0, -695700.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : IAU_SUN {East-longitude positive} Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : None Rel. light bend : Sun {source: plu060_merged} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : DEG Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240523.p240816 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-23. PREDICTS-> 2024-AUG-15 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 n.a. , 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 ) Table format : Comma Separated Values (spreadsheet) ******************************************************************************************************************************* Date__(UT)__HR:MN, , , R.A._(ICRF), DEC_(ICRF), dRA*cosD, d(DEC)/dt, hEcl-Lon,hEcl-Lat, PlAng, Tru_Anom, App_Lon_Sun, ******************************************************************************************************************************* $$SOE 2020-Jan-01 00:00, , , 294.38625, -22.22588, 0.766873, -0.14996, 292.4721, -0.6690, -0.00045, 68.0463, 72.9135626, 2020-Jan-02 00:00, , , 294.39184, -22.22656, 0.769985, -0.15064, 292.4771, -0.6705, -0.00045, 66.1206, 72.9212374, 2020-Jan-03 00:00, , , 294.39745, -22.22724, 0.771571, -0.15346, 292.4822, -0.6720, -0.00046, 65.0597, 73.0236344, 2020-Jan-04 00:00, , , 294.40306, -22.22794, 0.770190, -0.15591, 292.4872, -0.6736, -0.00047, 65.7631, 73.1345455, 2020-Jan-05 00:00, , , 294.40866, -22.22866, 0.767048, -0.15579, 292.4922, -0.6751, -0.00047, 67.6112, 73.1601537, 2020-Jan-06 00:00, , , 294.41423, -22.22936, 0.764919, -0.15322, 292.4971, -0.6767, -0.00047, 69.0064, 73.0814085, 2020-Jan-07 00:00, , , 294.41980, -22.23005, 0.765677, -0.15048, 292.5021, -0.6782, -0.00047, 68.6697, 72.9733861, 2020-Jan-08 00:00, , , 294.42538, -22.23072, 0.768619, -0.15002, 292.5071, -0.6797, -0.00047, 66.8865, 72.9378294, 2020-Jan-09 00:00, , , 294.43099, -22.23140, 0.771092, -0.15224, 292.5121, -0.6812, -0.00048, 65.3064, 73.0103863, 2020-Jan-10 00:00, , , 294.43660, -22.23209, 0.770863, -0.15517, 292.5171, -0.6828, -0.00049, 65.3188, 73.1308451, 2020-Jan-11 00:00, , , 294.44220, -22.23280, 0.768110, -0.15619, 292.5221, -0.6843, -0.00049, 66.8825, 73.1972369, 2020-Jan-12 00:00, , , 294.44778, -22.23351, 0.765262, -0.15439, 292.5271, -0.6859, -0.00050, 68.6570, 73.1544787, 2020-Jan-13 00:00, , , 294.45335, -22.23420, 0.764832, -0.15137, 292.5321, -0.6874, -0.00050, 69.0595, 73.0449001, 2020-Jan-14 00:00, , , 294.45892, -22.23488, 0.767178, -0.14983, 292.5370, -0.6889, -0.00050, 67.6873, 72.9717743, 2020-Jan-15 00:00, , , 294.46452, -22.23555, 0.770180, -0.15114, 292.5420, -0.6904, -0.00050, 65.8093, 73.0047869, 2020-Jan-16 00:00, , , 294.47013, -22.23623, 0.771131, -0.15412, 292.5470, -0.6919, -0.00051, 65.1218, 73.1184553, 2020-Jan-17 00:00, , , 294.47574, -22.23694, 0.769157, -0.15612, 292.5520, -0.6935, -0.00052, 66.1884, 73.2167719, 2020-Jan-18 00:00, , , 294.48133, -22.23765, 0.765992, -0.15535, 292.5570, -0.6951, -0.00052, 68.0880, 73.2167996, 2020-Jan-19 00:00, , , 294.48690, -22.23835, 0.764432, -0.15250, 292.5620, -0.6966, -0.00052, 69.1628, 73.1223152, 2020-Jan-20 00:00, , , 294.49246, -22.23902, 0.765842, -0.15010, 292.5670, -0.6981, -0.00052, 68.4078, 73.0227867, 2020-Jan-21 00:00, , , 294.49805, -22.23969, 0.768939, -0.15031, 292.5720, -0.6996, -0.00052, 66.5053, 73.0120961, 2020-Jan-22 00:00, , , 294.50365, -22.24037, 0.770930, -0.15292, 292.5770, -0.7011, -0.00053, 65.2048, 73.1035786, 2020-Jan-23 00:00, , , 294.50927, -22.24107, 0.770013, -0.15562, 292.5820, -0.7027, -0.00054, 65.6277, 73.2205140, 2020-Jan-24 00:00, , , 294.51486, -22.24178, 0.766980, -0.15598, 292.5870, -0.7042, -0.00055, 67.3878, 73.2639111, 2020-Jan-25 00:00, , , 294.52044, -22.24248, 0.764509, -0.15370, 292.5919, -0.7058, -0.00055, 68.9711, 73.1989420, 2020-Jan-26 00:00, , , 294.52600, -22.24316, 0.764777, -0.15079, 292.5969, -0.7073, -0.00055, 68.9436, 73.0881116, 2020-Jan-27 00:00, , , 294.53158, -22.24383, 0.767520, -0.14986, 292.6019, -0.7088, -0.00055, 67.3004, 73.0357854, 2020-Jan-28 00:00, , , 294.53717, -22.24450, 0.770263, -0.15173, 292.6069, -0.7103, -0.00055, 65.5642, 73.0927500, 2020-Jan-29 00:00, , , 294.54278, -22.24519, 0.770530, -0.15474, 292.6119, -0.7119, -0.00056, 65.2802, 73.2124409, 2020-Jan-30 00:00, , , 294.54839, -22.24590, 0.768058, -0.15619, 292.6169, -0.7134, -0.00057, 66.6604, 73.2935917, 2020-Jan-31 00:00, , , 294.55397, -22.24660, 0.765025, -0.15479, 292.6219, -0.7150, -0.00057, 68.5209, 73.2681973, 2020-Feb-01 00:00, , , 294.55953, -22.24729, 0.764108, -0.15180, 292.6268, -0.7165, -0.00057, 69.2183, 73.1628841, $$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 SYSTEM Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15 (if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any) are in the Julian calendar system, which is automatically extended for dates prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for matching historical dates. The Gregorian calendar more accurately corresponds to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is available if such physical events are the primary interest. NOTE: "n.a." in output means quantity "not available" at the print-time. 'R.A._(ICRF), DEC_(ICRF),' = 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} 'dRA*cosD, d(DEC)/dt,' = The angular rate of change in aparent RA and DEC of the target. This is with respect to the non-inertial IAU76/80 Earth true equator and equinox of-date reference frame. d(RA)/dt is multiplied by the cosine of declination to provide a linear rate in the plane-of-sky. Units: ARCSECONDS PER HOUR 'hEcl-Lon,hEcl-Lat,' = Geometric heliocentric J2000 ecliptic longitude and latitude of target center at the instant light leaves it to be observed at print time (print time minus down-leg light-time). Units: DEGREES 'PlAng,' = Angle between observer and target orbital plane, measured from center of target at the moment light seen at observation time leaves the target. Positive values indicate observer is above the objects' orbital plane, in the direction of reference-frame +z axis. Units: DEGREES 'Tru_Anom,' = Apparent true anomaly angle of the targets' heliocentric orbit position; the angle in the targets' instantaneous orbit plane from the orbital periapse direction to the target, measured positively in the direction of motion. The position of the target is taken to be at the moment light seen by the observer at print-time would have left the center of the object. That is, the heliocentric position of the target used to compute the true anomaly is one down-leg light-time prior to the print-time. Units: DEGREES 'App_Lon_Sun,' = The apparent target-centered longitude of the Sun ("apparent L_s") as seen at the target when the light recorded by the observer at print-time reflected off the target. It is referred to a coordinate system where the x-axis is the equinox direction defined by the targets' instantaneous IAU2015 pole direction and heliocentric orbit plane at reflection time, and is measured positively in an eastward direction (counter-clockwise around the positive pole of the solar system angular momentum vector). On bodies other than the Earth, the quantity can indicate boundary dates for the seasons: Northern hemisphere Southern hemisphere 0= Spring Equinox 0= Autumn Equinox 90= Summer Solstice 90= Winter Solstice 180= Autumn Equinox 180= Spring Equinox 270= Winter Solstice 270= Summer Solstice For Earth seasons, instead see quantity #31 ("ObsEcLon") as seen from the geocenter, with the Sun as a target. If the target has no associated spin-pole model (common for asteroids and comets), "n.a." will be output. Units: DEGREES Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA General site: https://ssd.jpl.nasa.gov/ Mailing list: https://ssd.jpl.nasa.gov/email_list.html System news : https://ssd.jpl.nasa.gov/horizons/news.html User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x API https://ssd-api.jpl.nasa.gov/doc/horizons.html command-line telnet ssd.jpl.nasa.gov 6775 e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/hrzn_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *******************************************************************************************************************************