API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Dec 09, 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 Mon Dec 9 18:37:40 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: MMS-4 (spacecraft) (-140485) {source: MMS-4} Center body name: Earth (399) {source: DE441} Center-site name: Swan Reach Imaging, Glenalta ******************************************************************************* 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 : 139.5701, -34.5440227, .056888 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 139.5701,5259.32258,-3596.34777 {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.241209.p250307 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-DEC-09. PREDICTS-> 2025-MAR-06 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 09:50 C 23 19 13.62 -16 42 35.7 339.858322 71.055592 n.a. n.a. 0.986322422933 0.0916476 0.00115001048536 -0.3101121 95.5820 /T 84.3515 105.1/ 0.9409 n.a. n.a. 31.583991 349.11651 -35.23495 2024-Nov-30 10:00 C 23 19 09.50 -16 37 23.5 333.100963 70.143387 n.a. n.a. 0.986322786655 0.0910401 0.00114878246278 -0.3010414 95.5963 /T 84.3372 105.0/ 0.9256 n.a. n.a. 31.961815 349.53049 -34.14888 2024-Nov-30 10:10 N 23 19 05.51 -16 32 07.2 326.939026 69.024332 n.a. n.a. 0.986323147928 0.0904222 0.00114759059344 -0.2920806 95.6115 /T 84.3221 105.0/ 0.9102 n.a. n.a. 32.327378 350.02525 -33.07780 2024-Nov-30 10:20 N 23 19 01.69 -16 26 46.9 321.378757 67.729721 n.a. n.a. 0.986323506712 0.0897938 0.00114643437330 -0.2832612 95.6277 /T 84.3059 104.9/ 0.8947 n.a. n.a. 32.681276 350.59794 -32.02444 2024-Nov-30 10:30 N 23 18 58.06 -16 21 22.5 316.389196 66.288541 n.a. n.a. 0.986323862962 0.0891547 0.00114531317264 -0.2746142 95.6451 /T 84.2886 104.8/ 0.8793 n.a. n.a. 33.024315 351.24583 -30.99150 2024-Nov-30 10:40 N 23 18 54.67 -16 15 54.2 311.919139 64.726204 n.a. n.a. 0.986324216636 0.0885048 0.00114422623728 -0.2661706 95.6638 /T 84.2700 104.8/ 0.8638 n.a. n.a. 33.357503 351.96620 -29.98163 2024-Nov-30 10:50 A 23 18 51.56 -16 10 22.0 307.909604 63.064225 n.a. n.a. 0.986324567691 0.0878439 0.00114317269020 -0.2579608 95.6839 /T 84.2500 104.7/ 0.8484 n.a. n.a. 33.682032 352.75639 -28.99748 2024-Nov-30 11:00 A 23 18 48.75 -16 04 46.1 304.301592 61.320438 n.a. n.a. 0.986324916082 0.0871721 0.00114215153338 -0.2500147 95.7055 /T 84.2284 104.6/ 0.8329 n.a. n.a. 33.999261 353.61372 -28.04166 2024-Nov-30 11:10 A 23 18 46.29 -15 59 06.4 301.040239 59.509460 n.a. n.a. 0.986325261765 0.0864891 0.00114116164990 -0.2423615 95.7288 /T 84.2052 104.6/ 0.8175 n.a. n.a. 34.310699 354.53546 -27.11676 2024-Nov-30 11:20 A 23 18 44.20 -15 53 23.1 298.076602 57.643215 n.a. n.a. 0.986325604694 0.0857947 0.00114020180652 -0.2350301 95.7538 /T 84.1803 104.5/ 0.8020 n.a. n.a. 34.617984 355.51883 -26.22534 2024-Nov-30 11:30 23 18 42.51 -15 47 36.3 295.368073 55.731425 n.a. n.a. 0.986325944824 0.0850890 0.00113927065626 -0.2280483 95.7806 /T 84.1535 104.4/ 0.7867 n.a. n.a. 34.922867 356.56094 -25.36992 2024-Nov-30 11:40 23 18 41.27 -15 41 46.0 292.878072 53.782044 n.a. n.a. 0.986326282109 0.0843716 0.00113836674148 -0.2214434 95.8095 /T 84.1247 104.4/ 0.7713 n.a. n.a. 35.227184 357.65879 -24.55294 2024-Nov-30 11:50 23 18 40.49 -15 35 52.5 290.575431 51.801610 n.a. n.a. 0.986326616501 0.0836425 0.00113748849696 -0.2152418 95.8404 /T 84.0938 104.3/ 0.7561 n.a. n.a. 35.532839 358.80924 -23.77679 2024-Nov-30 12:00 23 18 40.22 -15 29 55.7 288.433676 49.795532 n.a. n.a. 0.986326947954 0.0829016 0.00113663425354 -0.2094690 95.8735 /T 84.0608 104.3/ 0.7409 n.a. n.a. 35.841778 0.0090031 -23.04375 2024-Nov-30 12:10 23 18 40.48 -15 23 55.8 286.430329 47.768322 n.a. n.a. 0.986327276419 0.0821486 0.00113580224173 -0.2041494 95.9089 /T 84.0255 104.2/ 0.7258 n.a. n.a. 36.155963 1.2546210 -22.35600 2024-Nov-30 12:20 23 18 41.29 -15 17 52.9 284.546268 45.723770 n.a. n.a. 0.986327601847 0.0813835 0.00113499059550 -0.1993066 95.9466 /T 83.9878 104.2/ 0.7108 n.a. n.a. 36.477353 2.5424740 -21.71555 2024-Nov-30 12:30 23 18 42.69 -15 11 47.1 282.765179 43.665089 n.a. n.a. 0.986327924190 0.0806061 0.00113419735663 -0.1949632 95.9868 /T 83.9477 104.1/ 0.6959 n.a. n.a. 36.807870 3.8687770 -21.12429 2024-Nov-30 12:40 23 18 44.70 -15 05 38.6 281.073086 41.595031 n.a. n.a. 0.986328243398 0.0798161 0.00113342047874 -0.1911404 96.0295 /T 83.9050 104.0/ 0.6812 n.a. n.a. 37.149382 5.2295888 -20.58389 2024-Nov-30 12:50 23 18 47.34 -14 59 27.4 279.457957 39.515971 n.a. n.a. 0.986328559420 0.0790135 0.00113265783188 -0.1878586 96.0748 /T 83.8597 104.0/ 0.6665 n.a. n.a. 37.503674 6.6208260 -20.09582 2024-Nov-30 13:00 23 18 50.64 -14 53 13.7 277.909380 37.429978 n.a. n.a. 0.986328872204 0.0781981 0.00113190720716 -0.1851370 96.1228 /T 83.8118 103.9/ 0.6520 n.a. n.a. 37.872428 8.0382836 -19.66132 2024-Nov-30 13:10 23 18 54.62 -14 46 57.6 276.418288 35.338877 n.a. n.a. 0.986329181700 0.0773696 0.00113116632137 -0.1829933 96.1736 /T 83.7610 103.9/ 0.6376 n.a. n.a. 38.257196 9.4776612 -19.28138 2024-Nov-30 13:20 23 18 59.30 -14 40 39.2 274.976741 33.244289 n.a. n.a. 0.986329487854 0.0765280 0.00113043282193 -0.1814443 96.2272 /T 83.7075 103.8/ 0.6234 n.a. n.a. 38.659388 10.934593 -18.95670 2024-Nov-30 13:30 23 19 04.70 -14 34 18.6 273.577736 31.147671 n.a. n.a. 0.986329790613 0.0756730 0.00112970429180 -0.1805054 96.2837 /T 83.6510 103.8/ 0.6094 n.a. n.a. 39.080247 12.404684 -18.68774 2024-Nov-30 13:40 23 19 10.84 -14 27 56.0 272.215056 29.050345 n.a. n.a. 0.986330089923 0.0748045 0.00112897825466 -0.1801908 96.3432 /T 83.5916 103.8/ 0.5955 n.a. n.a. 39.520839 13.883546 -18.47464 2024-Nov-30 13:50 23 19 17.73 -14 21 31.5 270.883142 26.953525 n.a. n.a. 0.986330385730 0.0739223 0.00112825217987 -0.1805134 96.4056 /T 83.5292 103.7/ 0.5819 n.a. n.a. 39.982038 15.366837 -18.31727 2024-Nov-30 14:00 23 19 25.40 -14 15 05.2 269.576983 24.858333 n.a. n.a. 0.986330677977 0.0730261 0.00112752348783 -0.1814846 96.4711 /T 83.4638 103.7/ 0.5684 n.a. n.a. 40.464520 16.850302 -18.21521 2024-Nov-30 14:10 23 19 33.84 -14 08 37.2 268.292030 22.765824 n.a. n.a. 0.986330966608 0.0721157 0.00112678955506 -0.1831149 96.5396 /T 83.3953 103.7/ 0.5551 n.a. n.a. 40.968757 18.329809 -18.16776 2024-Nov-30 14:20 23 19 43.09 -14 02 07.6 267.024117 20.676993 n.a. n.a. 0.986331251566 0.0711911 0.00112604771959 -0.1854131 96.6113 /T 83.3237 103.6/ 0.5420 n.a. n.a. 41.495012 19.801387 -18.17396 2024-Nov-30 14:30 23 19 53.13 -13 55 36.6 265.769399 18.592795 n.a. n.a. 0.986331532793 0.0702519 0.00112529528617 -0.1883869 96.6861 /T 83.2489 103.6/ 0.5292 n.a. n.a. 42.043343 21.261258 -18.23262 2024-Nov-30 14:40 23 20 04.00 -13 49 04.3 264.524292 16.514149 n.a. n.a. 0.986331810231 0.0692979 0.00112452953159 -0.1920426 96.7641 /T 83.1709 103.6/ 0.5165 n.a. n.a. 42.613607 22.705866 -18.34231 2024-Nov-30 14:50 23 20 15.69 -13 42 30.6 263.285433 14.441957 n.a. n.a. 0.986332083819 0.0683289 0.00112374770991 -0.1963852 96.8453 /T 83.0898 103.6/ 0.5041 n.a. n.a. 43.205466 24.131899 -18.50139 2024-Nov-30 15:00 23 20 28.22 -13 35 55.9 262.049631 12.377105 n.a. n.a. 0.986332353496 0.0673447 0.00112294705775 -0.2014183 96.9298 /T 83.0054 103.5/ 0.4919 n.a. n.a. 43.818393 25.536309 -18.70807 2024-Nov-30 15:10 23 20 41.58 -13 29 20.2 260.813835 10.320475 n.a. n.a. 0.986332619201 0.0663451 0.00112212479950 -0.2071445 97.0174 /T 82.9178 103.5/ 0.4800 n.a. n.a. 44.451690 26.916325 -18.96041 2024-Nov-30 15:20 23 20 55.78 -13 22 43.5 259.575101 8.272954 n.a. n.a. 0.986332880872 0.0653297 0.00112127815233 -0.2135648 97.1083 /T 82.8270 103.5/ 0.4683 n.a. n.a. 45.104495 28.269458 -19.25633 2024-Nov-30 15:30 23 21 10.83 -13 16 05.9 258.330562 6.235439 n.a. n.a. 0.986333138445 0.0642985 0.00112040433158 -0.2206792 97.2025 /T 82.7329 103.5/ 0.4569 n.a. n.a. 45.775798 29.593505 -19.59369 2024-Nov-30 15:40 23 21 26.72 -13 09 27.6 257.077406 4.208848 n.a. n.a. 0.986333391856 0.0632510 0.00111950055547 -0.2284861 97.2998 /T 82.6356 103.5/ 0.4457 n.a. n.a. 46.464455 30.886545 -19.97028 2024-Nov-30 15:50 23 21 43.46 -13 02 48.7 255.812848 2.194123 n.a. n.a. 0.986333641039 0.0621871 0.00111856405023 -0.2369831 97.4005 /T 82.5351 103.5/ 0.4347 n.a. n.a. 47.169206 32.146933 -20.38383 2024-Nov-30 16:00 23 22 01.04 -12 56 09.2 254.534112 0.192241 n.a. n.a. 0.986333885927 0.0611065 0.00111759205500 -0.2461664 97.5043 /T 82.4313 103.5/ 0.4240 n.a. n.a. 47.888688 33.373288 -20.83210 >..... Elevation Cut-off Requested .....< $$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 ***************************************************************************************************************************************************************************************************************************************************