API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Dec 10, 2024 MMS-4 Spacecraft / (Earth) -140485 https://www.nasa.gov/mission_pages/mms/index.html MMS 4 Magnetospheric Multiscale (MMS) mission: the fourth of four identically instrumented space physics spacecraft studying the Earth's magnetosphere. Octagonal in shape; 2.5-m wide, 1.2-m high, spinning at 3 rpm during science operations. Eight deployable booms: four 60-meter wire booms, two 12.5 meter booms, two 5-m booms. Mass: 1250 kg; 318 W power generation; S-band communications. NOTE: The spacecraft may be maneuvered frequently. Therefore, the JSpOC TLE-based trajectory provided here may at times depart from the actual trajectory. This can happen because TLEs do not model thruster firings; the TLE trajectory solutions must be reinitialized after each event. Launched: 2015-Mar-13 02:44 UTC (Atlas V, Cape Canaveral, USA) ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu Dec 12 03:48:27 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: MMS-4 (spacecraft) (-140485) {source: MMS-4} Center body name: Earth (399) {source: DE441} Center-site name: VdS Remote Observatory, Hakos ******************************************************************************* Start time : A.D. 2024-Nov-30 00:00:00.0000 UT Stop time : A.D. 2024-Dec-01 00:00:00.0000 UT Step-size : 10 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 16.3613, -23.2365766, 1.8515 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 16.3613,5865.52307,-2501.54567 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Earth Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian RTS-only print : NO EOP file : eop.241211.p250309 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-DEC-11. PREDICTS-> 2025-MAR-08 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation ( 0.0deg=YES),Airmass (>38.000=NO), Daylight (YES) Table cut-offs 2: Solar elongation ( 12.0,180.0=YES),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 Azi____(a-app)___Elev APmag S-brt r rdot delta deldot S-O-T /r S-T-O T-O-M/MN_Illu% RA_3sigma DEC_3sigma Sky_motion Sky_mot_PA RelVel-ANG *************************************************************************************************************************************************************************************************************************************************** $$SOE >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2024-Nov-30 17:40 C 23 32 21.36 -12 51 07.9 10.408115 79.314231 n.a. n.a. 0.986336083164 0.0493186 0.00105030158049 -0.7032882 99.7602 /T 80.1796 105.9/ 0.4853 n.a. n.a. 37.078503 346.84909 -56.20394 2024-Nov-30 17:50 Ct 23 32 15.55 -12 45 04.2 357.021213 79.364361 n.a. n.a. 0.986336276090 0.0480347 0.00104749727708 -0.6931583 99.7747 /T 80.1652 105.8/ 0.4752 n.a. n.a. 37.602328 346.94269 -55.51563 2024-Nov-30 18:00 N 23 32 09.73 -12 38 55.3 344.143476 78.879856 n.a. n.a. 0.986336463831 0.0467304 0.00104473353830 -0.6830543 99.7898 /T 80.1503 105.7/ 0.4650 n.a. n.a. 38.110558 347.12793 -54.83159 2024-Nov-30 18:10 N 23 32 03.93 -12 32 41.1 332.767546 77.924235 n.a. n.a. 0.986336646303 0.0454052 0.00104201018544 -0.6730133 99.8055 /T 80.1347 105.7/ 0.4548 n.a. n.a. 38.602921 347.40197 -54.15340 2024-Nov-30 18:20 N 23 31 58.21 -12 26 21.8 323.273131 76.597491 n.a. n.a. 0.986336823422 0.0440589 0.00103932689147 -0.6630723 99.8221 /T 80.1183 105.6/ 0.4446 n.a. n.a. 39.079476 347.76210 -53.48257 2024-Nov-30 18:30 A 23 31 52.60 -12 19 57.2 315.559467 74.997576 n.a. n.a. 0.986336995103 0.0426909 0.00103668318122 -0.6532682 99.8396 /T 80.1009 105.5/ 0.4344 n.a. n.a. 39.540608 348.20579 -52.82047 2024-Nov-30 18:40 A 23 31 47.16 -12 13 27.6 309.326211 73.202349 n.a. n.a. 0.986337161257 0.0413009 0.00103407843190 -0.6436375 99.8583 /T 80.0824 105.5/ 0.4242 n.a. n.a. 39.987013 348.73058 -52.16843 2024-Nov-30 18:50 A 23 31 41.93 -12 06 52.9 304.254066 71.268006 n.a. n.a. 0.986337321795 0.0398885 0.00103151187423 -0.6342167 99.8783 /T 80.0626 105.4/ 0.4141 n.a. n.a. 40.419690 349.33412 -51.52766 2024-Nov-30 19:00 23 31 36.94 -12 00 13.1 300.073269 69.233621 n.a. n.a. 0.986337476627 0.0384533 0.00102898259354 -0.6250419 99.8997 /T 80.0413 105.4/ 0.4040 n.a. n.a. 40.839923 350.01410 -50.89931 2024-Nov-30 19:10 23 31 32.26 -11 53 28.4 296.574810 67.126200 n.a. n.a. 0.986337625660 0.0369948 0.00102648953170 -0.6161486 99.9228 /T 80.0184 105.3/ 0.3940 n.a. n.a. 41.249269 350.76821 -50.28445 2024-Nov-30 19:20 23 31 27.91 -11 46 38.8 293.601964 64.964581 n.a. n.a. 0.986337768799 0.0355126 0.00102403148896 -0.6075717 99.9476 /T 79.9937 105.2/ 0.3840 n.a. n.a. 41.649542 351.59410 -49.68411 2024-Nov-30 19:30 23 31 23.95 -11 39 44.3 291.038194 62.762128 n.a. n.a. 0.986337905949 0.0340062 0.00102160712664 -0.5993456 99.9743 /T 79.9671 105.2/ 0.3741 n.a. n.a. 42.042790 352.48939 -49.09921 2024-Nov-30 19:40 23 31 20.41 -11 32 45.1 288.796559 60.528508 n.a. n.a. 0.986338037011 0.0324751 0.00101921496966 -0.5915039 100.0032 /T 79.9384 105.1/ 0.3643 n.a. n.a. 42.431280 353.45159 -48.53065 2024-Nov-30 19:50 23 31 17.35 -11 25 41.2 286.811613 58.270859 n.a. n.a. 0.986338161886 0.0309189 0.00101685340981 -0.5840794 100.0342 /T 79.9075 105.0/ 0.3546 n.a. n.a. 42.817466 354.47805 -47.97927 2024-Nov-30 20:00 23 31 14.79 -11 18 32.7 285.033525 55.994559 n.a. n.a. 0.986338280471 0.0293370 0.00101452070919 -0.5771039 100.0677 /T 79.8742 105.0/ 0.3450 n.a. n.a. 43.203974 355.56601 -47.44582 2024-Nov-30 20:10 23 31 12.79 -11 11 19.6 283.423871 53.703740 n.a. n.a. 0.986338392662 0.0277290 0.00101221500384 -0.5706084 100.1036 /T 79.8384 104.9/ 0.3355 n.a. n.a. 43.593561 356.71246 -46.93107 2024-Nov-30 20:20 23 31 11.38 -11 04 02.2 281.952646 51.401638 n.a. n.a. 0.986338498354 0.0260943 0.00100993430792 -0.5646228 100.1423 /T 79.7999 104.9/ 0.3261 n.a. n.a. 43.989097 357.91423 -46.43568 2024-Nov-30 20:30 23 31 10.60 -10 56 40.4 280.596126 49.090829 n.a. n.a. 0.986338597438 0.0244324 0.00100767651798 -0.5591758 100.1837 /T 79.7586 104.8/ 0.3169 n.a. n.a. 44.393523 359.16788 -45.96031 2024-Nov-30 20:40 23 31 10.49 -10 49 14.4 279.335326 46.773403 n.a. n.a. 0.986338689803 0.0227426 0.00100543941753 -0.5542949 100.2280 /T 79.7144 104.8/ 0.3078 n.a. n.a. 44.809820 0.4697490 -45.50557 2024-Nov-30 20:50 23 31 11.08 -10 41 44.2 278.154873 44.451080 n.a. n.a. 0.986338775338 0.0210245 0.00100322068188 -0.5500066 100.2754 /T 79.6671 104.7/ 0.2989 n.a. n.a. 45.240973 1.8159263 -45.07204 2024-Nov-30 21:00 23 31 12.42 -10 34 09.9 277.042181 42.125297 n.a. n.a. 0.986338853925 0.0192774 0.00100101788322 -0.5463359 100.3260 /T 79.6167 104.7/ 0.2901 n.a. n.a. 45.689934 3.2022584 -44.66027 2024-Nov-30 21:10 23 31 14.53 -10 26 31.8 275.986834 39.797274 n.a. n.a. 0.986338925450 0.0175007 0.00099882849587 -0.5433065 100.3799 /T 79.5629 104.6/ 0.2815 n.a. n.a. 46.159586 4.6243651 -44.27078 2024-Nov-30 21:20 23 31 17.45 -10 18 49.7 274.980120 37.468060 n.a. n.a. 0.986338989790 0.0156938 0.00099664990166 -0.5409408 100.4372 /T 79.5057 104.6/ 0.2731 n.a. n.a. 46.652706 6.0776597 -43.90407 2024-Nov-30 21:30 23 31 21.20 -10 11 03.9 274.014678 35.138569 n.a. n.a. 0.986339046823 0.0138560 0.00099447939565 -0.5392598 100.4981 /T 79.4450 104.5/ 0.2649 n.a. n.a. 47.171927 7.5573788 -43.56060 2024-Nov-30 21:40 23 31 25.83 -10 03 14.5 273.084225 32.809607 n.a. n.a. 0.986339096425 0.0119867 0.00099231419174 -0.5382828 100.5626 /T 79.3807 104.5/ 0.2568 n.a. n.a. 47.719712 9.0586194 -43.24081 2024-Nov-30 21:50 23 31 31.36 -09 55 21.4 272.183342 30.481896 n.a. n.a. 0.986339138467 0.0100851 0.00099015142868 -0.5380279 100.6308 /T 79.3126 104.4/ 0.2490 n.a. n.a. 48.298317 10.576383 -42.94512 2024-Nov-30 22:00 23 31 37.81 -09 47 24.9 271.307310 28.156086 n.a. n.a. 0.986339172818 0.0081505 0.00098798817593 -0.5385117 100.7028 /T 79.2407 104.4/ 0.2414 n.a. n.a. 48.909769 12.105623 -42.67389 2024-Nov-30 22:10 23 31 45.22 -09 39 25.0 270.451963 25.832769 n.a. n.a. 0.986339199021 0.0060237 0.00098582061736 -0.5401521 100.7788 /T 79.1648 104.4/ 0.2340 n.a. n.a. 49.549058 13.637078 -42.45270 2024-Nov-30 22:20 23 31 53.60 -09 31 21.8 269.613597 23.512492 n.a. n.a. 0.986339216667 0.0038844 0.00098364501863 -0.5424994 100.8587 /T 79.0850 104.4/ 0.2268 n.a. n.a. 50.225309 15.171028 -42.25270 2024-Nov-30 22:30 23 32 02.97 -09 23 15.4 268.788895 21.195770 n.a. n.a. 0.986339225724 0.0017408 0.00098145856765 -0.5455437 100.9428 /T 79.0011 104.3/ 0.2198 n.a. n.a. 50.940157 16.702718 -42.07276 2024-Nov-30 22:40 23 32 13.36 -09 15 06.0 267.974839 18.883091 n.a. n.a. 0.986339226184 -0.0004021 0.00097925847817 -0.5492811 101.0310 /T 78.9131 104.3/ 0.2131 n.a. n.a. 51.694831 18.227432 -41.91220 2024-Nov-30 22:50 23 32 24.80 -09 06 53.4 267.168657 16.574918 n.a. n.a. 0.986339218057 -0.0025420 0.00097704196682 -0.5537140 101.1234 /T 78.8208 104.3/ 0.2066 n.a. n.a. 52.490145 19.740572 -41.77084 2024-Nov-30 23:00 23 32 37.29 -08 58 37.8 266.367766 14.271699 n.a. n.a. 0.986339201353 -0.0046797 0.00097480622824 -0.5588510 101.2201 /T 78.7242 104.3/ 0.2003 n.a. n.a. 53.326492 21.237719 -41.64894 2024-Nov-30 23:10 23 32 50.85 -08 50 19.3 265.569736 11.973870 n.a. n.a. 0.986339176075 -0.0068188 0.00097254841104 -0.5647064 101.3212 /T 78.6233 104.3/ 0.1943 n.a. n.a. 54.203858 22.714698 -41.54717 2024-Nov-30 23:20 23 33 05.51 -08 41 57.8 264.772246 9.681859 n.a. n.a. 0.986339142206 -0.0089655 0.00097026559680 -0.5712990 101.4267 /T 78.5179 104.3/ 0.1885 n.a. n.a. 55.121837 24.167631 -41.46647 2024-Nov-30 23:30 23 33 21.27 -08 33 33.5 263.973059 7.396089 n.a. n.a. 0.986339099698 -0.0111281 0.00096795478323 -0.5786515 101.5367 /T 78.4081 104.3/ 0.1830 n.a. n.a. 56.079676 25.592983 -41.40802 2024-Nov-30 23:40 23 33 38.15 -08 25 06.2 263.169986 5.116985 n.a. n.a. 0.986339048469 -0.0133163 0.00096561287417 -0.5867878 101.6512 /T 78.2937 104.3/ 0.1777 n.a. n.a. 57.076315 26.987598 -41.37302 2024-Nov-30 23:50 23 33 56.16 -08 16 36.2 262.360863 2.844976 n.a. n.a. 0.986338988396 -0.0155404 0.00096323667614 -0.5957321 101.7703 /T 78.1748 104.3/ 0.1726 n.a. n.a. 58.110447 28.348716 -41.36264 2024-Dec-01 00:00 23 34 15.31 -08 08 03.4 261.543524 0.580499 n.a. n.a. 0.986338919314 -0.0178109 0.00096082290266 -0.6055063 101.8940 /T 78.0513 104.3/ 0.1679 n.a. n.a. 59.180568 29.673981 -41.37783 $$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. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence condition code: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET EVENT MARKER (OBSERVING SITE) The solar-presence code column is immediately followed by another marker: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric The lunar presence marker (an ongoing state) can be over-ridden by a target event marker if an event has occurred since the last output step: 'r' Rise (target body on or went above cut-off RTS elevation) 'e' Elevation max (target body maximum elevation angle has occurred) 't' Transit (target body at or passed through observer meridian) 's' Set (target body on or went below cut-off RTS elevation) RTS MARKERS (TVH) Rise and set are with respect to the reference ellipsoid true visual horizon defined by the elevation cut-off angle. Horizon dip and yellow-light refraction (Earth only) are considered. Accuracy is < or = to twice the requested search step-size. '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} 'Azi____(a-app)___Elev' = Airless apparent azimuth and elevation of target center. Compensated for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth is measured clockwise from north: North(0) -> East(90) -> South(180) -> West(270) -> North (360) Elevation angle is with respect to a plane perpendicular to the reference surface local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES '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 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S '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 'T-O-M/MN_Illu%' = Target-Observer-Moon LUNAR ELONGATION angle and illuminated percentage. The apparent lunar elongation angle between target body center and Moon center, seen from the observing site, along with fraction of the lunar disk illuminated by the Sun. A negative lunar elongation angle indicates the target center is behind the Moon. Units: DEGREES & PERCENT 'RA_3sigma DEC_3sigma' = Uncertainty in Right-Ascension and Declination. Output values are the formal +/- 3 standard-deviations (sigmas) around nominal position. Units: ARCSECONDS 'Sky_motion Sky_mot_PA RelVel-ANG' = Total apparent angular rate of the target in the plane-of-sky. "Sky_mot_PA" is the position angle of the target's direction of motion in the plane-of-sky, measured counter-clockwise from the apparent of-date north pole direction. "RelVel-ANG" is the flight path angle of the target's relative motion with respect to the observer's line-of-sight, in the range [-90,+90], where positive values indicate motion away from the observer, negative values are toward the observer: -90 = target is moving directly toward the observer 0 = target is moving at right angles to the observer's line-of-sight +90 = target is moving directly away from the observer UNITS: ARCSECONDS/MINUTE, DEGREES, 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 ***************************************************************************************************************************************************************************************************************************************************