API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Mar 29, 2025 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 Fri Apr 18 18:17:42 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: MMS-4 (spacecraft) (-140485) {source: MMS-4} Center body name: Earth (399) {source: DE441} Center-site name: SATINO Remote Observatory, Haute Provence ******************************************************************************* Start time : A.D. 2024-Oct-31 00:00:00.0000 UT Stop time : A.D. 2024-Nov-01 00:00:00.0000 UT Step-size : 10 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 5.7124, 43.9320269, .703985 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 5.7124, 4601.22659, 4403.14405 {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.250418.p250715 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-APR-18. PREDICTS-> 2025-JUL-14 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 2024-Oct-31 00:00 00 29 04.62 +06 33 00.8 233.002409 40.177393 n.a. n.a. 0.993215449438 -2.3175231 0.00040249442140 -2.4227927 151.3990 /T 28.5895 167.7/ 2.0256 n.a. n.a. 211.90957 22.911730 -66.94760 2024-Oct-31 00:10 00 30 02.01 +07 06 18.3 235.791652 39.297695 n.a. n.a. 0.993206054256 -2.3704528 0.00039270702502 -2.4593773 151.7819 /T 28.2070 168.0/ 2.0016 n.a. n.a. 222.20284 23.382605 -66.78558 2024-Oct-31 00:20 00 31 03.47 +07 41 07.2 238.515785 38.395732 n.a. n.a. 0.993196440982 -2.4263205 0.00038276799628 -2.4984712 152.1805 /T 27.8089 168.3/ 1.9779 n.a. n.a. 233.43187 23.860334 -66.62128 2024-Oct-31 00:30 00 32 09.42 +08 17 35.7 241.178420 37.478557 n.a. n.a. 0.993186597277 -2.4854094 0.00037266688668 -2.5402714 152.5954 /T 27.3944 168.6/ 1.9544 n.a. n.a. 245.72478 24.342841 -66.45415 2024-Oct-31 00:40 00 33 20.34 +08 55 53.0 243.783677 36.553426 n.a. n.a. 0.993176509591 -2.5480424 0.00036239241487 -2.5849971 153.0274 /T 26.9627 168.8/ 1.9312 n.a. n.a. 259.23359 24.828131 -66.28356 2024-Oct-31 00:50 00 34 36.75 +09 36 10.0 246.336093 35.627856 n.a. n.a. 0.993166162985 -2.6145893 0.00035193237162 -2.6328927 153.4774 /T 26.5132 169.1/ 1.9082 n.a. n.a. 274.14001 25.314311 -66.10874 2024-Oct-31 01:00 00 35 59.29 +10 18 38.9 248.840560 34.709718 n.a. n.a. 0.993155540931 -2.6854754 0.00034127350822 -2.6842332 153.9457 /T 26.0453 169.4/ 1.8856 n.a. n.a. 290.66293 25.799616 -65.92876 2024-Oct-31 01:10 00 37 28.66 +11 03 34.2 251.302281 33.807352 n.a. n.a. 0.993144625063 -2.7611935 0.00033040140433 -2.7393293 154.4330 /T 25.5584 169.6/ 1.8632 n.a. n.a. 309.06840 26.282439 -65.74248 2024-Oct-31 01:20 00 39 05.72 +11 51 12.8 253.726753 32.929713 n.a. n.a. 0.993133394886 -2.8423169 0.00031930031144 -2.7985342 154.9392 /T 25.0527 169.9/ 1.8411 n.a. n.a. 329.68279 26.761376 -65.54853 2024-Oct-31 01:30 00 40 51.47 +12 41 54.4 256.119775 32.086569 n.a. n.a. 0.993121827410 -2.9295174 0.00030795296612 -2.8622521 155.4639 /T 24.5283 170.1/ 1.8193 n.a. n.a. 352.91071 27.235270 -65.34525 2024-Oct-31 01:40 00 42 47.09 +13 36 02.8 258.487491 31.288746 n.a. n.a. 0.993109896723 -3.0235873 0.00029634036660 -2.9309479 156.0062 /T 23.9865 170.2/ 1.7979 n.a. n.a. 379.25959 27.703286 -65.13058 2024-Oct-31 01:50 00 44 54.05 +14 34 06.4 260.836472 30.548454 n.a. n.a. 0.993097573444 -3.1254679 0.00028444150423 -3.0051604 156.5636 /T 23.4295 170.3/ 1.7767 n.a. n.a. 409.37393 28.165006 -64.90195 2024-Oct-31 02:00 00 47 14.11 +15 36 39.6 263.173848 29.879724 n.a. n.a. 0.993084824062 -3.2362861 0.00027223304016 -3.0855163 157.1324 /T 22.8611 170.2/ 1.7559 n.a. n.a. 444.08411 28.620567 -64.65616 2024-Oct-31 02:10 00 49 49.50 +16 44 24.8 265.507520 29.298995 n.a. n.a. 0.993071610097 -3.3574022 0.00025968891487 -3.1727497 157.7060 /T 22.2879 170.0/ 1.7354 n.a. n.a. 484.47724 29.070858 -64.38908 2024-Oct-31 02:20 00 52 43.03 +17 58 14.7 267.846484 28.825919 n.a. n.a. 0.993057887045 -3.4904727 0.00024677987767 -3.2677230 158.2741 /T 21.7203 169.7/ 1.7152 n.a. n.a. 532.00250 29.517832 -64.09540 2024-Oct-31 02:30 00 55 58.36 +19 19 15.7 270.201321 28.484516 n.a. n.a. 0.993043603029 -3.6375342 0.00023347292258 -3.3714519 158.8200 /T 21.1748 169.2/ 1.6953 n.a. n.a. 588.63210 29.964979 -63.76806 2024-Oct-31 02:40 00 59 40.30 +20 48 53.4 272.584988 28.304827 n.a. n.a. 0.993028697068 -3.8011141 0.00021973062191 -3.4851315 159.3181 /T 20.6771 168.4/ 1.6758 n.a. n.a. 657.11453 30.418101 -63.39750 2024-Oct-31 02:50 01 03 55.42 +22 28 59.8 275.014082 28.325408 n.a. n.a. 0.993013096818 -3.9843811 0.00020551036415 -3.6101562 159.7280 /T 20.2676 167.3/ 1.6566 n.a. n.a. 741.38757 30.886623 -62.97040 2024-Oct-31 03:00 01 08 52.96 +24 22 05.2 277.510999 28.597167 n.a. n.a. 0.992996715620 -4.1913453 0.00019076354607 -3.7481187 159.9875 /T 20.0085 165.9/ 1.6377 n.a. n.a. 847.27961 31.385896 -62.46756 2024-Oct-31 03:10 01 14 46.43 +26 31 36.8 280.107750 29.189548 n.a. n.a. 0.992979448623 -4.4271234 0.00017543487969 -3.9007430 160.0008 /T 19.9955 164.1/ 1.6192 n.a. n.a. 983.75881 31.941520 -61.86024 2024-Oct-31 03:20 01 21 56.57 +29 02 30.0 282.853208 30.200929 n.a. n.a. 0.992961167698 -4.6982738 0.00015946225952 -4.0696448 159.6227 /T 20.3739 161.7/ 1.6010 n.a. n.a. 1165.2883 32.597945 -61.10325 2024-Oct-31 03:30 01 30 57.42 +32 02 01.9 285.827938 31.777117 n.a. n.a. 0.992941714907 -5.0131723 0.00014277838093 -4.2556226 158.6357 /T 21.3612 158.7/ 1.5831 n.a. n.a. 1416.5795 33.437103 -60.12146 2024-Oct-31 03:40 01 42 49.63 +35 41 30.0 289.177826 34.146341 n.a. n.a. 0.992920894620 -5.3822700 0.00012531736010 -4.4566508 156.7145 /T 23.2826 154.8/ 1.5656 n.a. n.a. 1783.0088 34.623099 -58.78092 2024-Oct-31 03:50 01 59 34.92 +40 19 16.8 293.201669 37.690424 n.a. n.a. 0.992898465653 -5.8176632 0.00010703573047 -4.6620074 153.3541 /T 26.6431 149.6/ 1.5484 n.a. n.a. 2355.8258 36.524961 -56.82170 2024-Oct-31 04:00 02 26 03.21 +46 26 18.4 298.628820 43.099149 n.a. n.a. 0.992874139271 -6.3300937 0.00008797736146 -4.8336691 147.6840 /L 32.3132 142.2/ 1.5315 n.a. n.a. 3340.5477 40.122602 -53.68413 2024-Oct-31 04:10 03 17 13.24 +54 48 18.7 307.814569 51.688359 n.a. n.a. 0.992847602961 -6.9175212 0.00006848734257 -4.8399652 137.9345 /L 42.0628 131.0/ 1.5150 n.a. n.a. 5262.3118 48.752903 -48.00748 2024-Oct-31 04:20 05 36 54.22 +64 12 20.5 333.296143 65.045535 n.a. n.a. 0.992818631498 -7.5288996 0.00004999641149 -4.1928732 119.8958 /L 60.1015 111.6/ 1.4988 n.a. n.a. 9503.0547 77.506781 -36.12962 2024-Oct-31 04:30 t 10 12 45.27 +51 57 41.3 59.092687 62.176921 n.a. n.a. 0.992787442185 -7.9740532 0.00003776839416 -1.3721122 85.1307 /L 94.8668 75.5/ 1.4829 n.a. n.a. 16692.947 135.80189 -10.20575 2024-Oct-31 04:40 A 12 22 30.24 +12 46 05.3 94.443215 22.908820 n.a. n.a. 0.992755476349 -7.8312200 0.00004191850776 3.2855058 40.0357 /L 139.9621 28.7/ 1.4674 n.a. n.a. 14894.065 151.68716 23.523174 >..... Elevation Cut-off Requested .....< 2024-Oct-31 16:50 C 22 07 58.70 -41 04 30.1 155.240906 -0.125571 n.a. n.a. 0.992768399054 0.4972263 0.00076960689771 1.3388001 99.0559 /T 80.9005 106.0/ 0.7462 n.a. n.a. 59.097648 24.652663 67.674321 2024-Oct-31 17:00 N 22 08 19.84 -40 55 34.3 156.870158 0.718900 n.a. n.a. 0.992770377508 0.4939952 0.00077495884291 1.3318948 99.1785 /T 80.7775 106.1/ 0.7355 n.a. n.a. 58.658376 23.576072 67.580732 2024-Oct-31 17:10 N 22 08 39.92 -40 46 37.9 158.529573 1.520313 n.a. n.a. 0.992772342992 0.4907455 0.00078028417838 1.3255072 99.2985 /T 80.6573 106.1/ 0.7247 n.a. n.a. 58.290248 22.549044 67.472248 2024-Oct-31 17:20 N 22 08 59.02 -40 37 40.7 160.218380 2.276990 n.a. n.a. 0.992774295436 0.4874784 0.00078558493866 1.3196167 99.4160 /T 80.5395 106.2/ 0.7138 n.a. n.a. 57.987634 21.575686 67.349932 2024-Oct-31 17:30 N 22 09 17.21 -40 28 42.4 161.935676 2.987288 n.a. n.a. 0.992776234773 0.4841957 0.00079086307424 1.3142019 99.5313 /T 80.4239 106.3/ 0.7028 n.a. n.a. 57.744994 20.659528 67.214915 2024-Oct-31 17:40 A 22 09 34.56 -40 19 43.0 163.680422 3.649615 n.a. n.a. 0.992778160944 0.4808986 0.00079612044962 1.3092412 99.6446 /T 80.3104 106.3/ 0.6918 n.a. n.a. 57.556914 19.803517 67.068373 2024-Oct-31 17:50 A 22 09 51.15 -40 10 42.3 165.451438 4.262435 n.a. n.a. 0.992780073894 0.4775886 0.00080135884139 1.3047125 99.7560 /T 80.1986 106.4/ 0.6807 n.a. n.a. 57.418149 19.010017 66.911502 2024-Oct-31 18:00 A 22 10 07.04 -40 01 40.1 167.247401 4.824279 n.a. n.a. 0.992781973575 0.4742668 0.00080657993653 1.3005933 99.8658 /T 80.0886 106.4/ 0.6695 n.a. n.a. 57.323653 18.280834 66.745496 2024-Oct-31 18:10 22 10 22.30 -39 52 36.4 169.066851 5.333758 n.a. n.a. 0.992783859941 0.4709345 0.00081178533062 1.2968604 99.9741 /T 79.9799 106.5/ 0.6582 n.a. n.a. 57.268608 17.617245 66.571525 2024-Oct-31 18:20 22 10 36.99 -39 43 31.2 170.908187 5.789572 n.a. n.a. 0.992785732955 0.4675928 0.00081697652645 1.2934908 100.0812 /T 79.8726 106.5/ 0.6470 n.a. n.a. 57.248453 17.020031 66.390720 2024-Oct-31 18:30 22 10 51.19 -39 34 24.3 172.769679 6.190521 n.a. n.a. 0.992787592580 0.4642429 0.00082215493254 1.2904605 100.1872 /T 79.7663 106.6/ 0.6356 n.a. n.a. 57.258891 16.489524 66.204157 2024-Oct-31 18:40 22 11 04.95 -39 25 15.8 174.649470 6.535514 n.a. n.a. 0.992789438786 0.4608858 0.00082732186189 1.2877458 100.2923 /T 79.6609 106.6/ 0.6243 n.a. n.a. 57.295910 16.025651 66.012840 2024-Oct-31 18:50 22 11 18.34 -39 16 05.6 176.545594 6.823582 n.a. n.a. 0.992791271546 0.4575225 0.00083247853084 1.2853224 100.3967 /T 79.5563 106.7/ 0.6129 n.a. n.a. 57.355786 15.627982 65.817696 2024-Oct-31 19:00 22 11 31.41 -39 06 53.7 178.455981 7.053882 n.a. n.a. 0.992793090838 0.4541539 0.00083762605819 1.2831658 100.5005 /T 79.4522 106.7/ 0.6015 n.a. n.a. 57.435088 15.295772 65.619567 2024-Oct-31 19:10 t 22 11 44.22 -38 57 40.1 180.378481 7.225708 n.a. n.a. 0.992794896643 0.4507810 0.00084276546436 1.2812515 100.6038 /T 79.3486 106.7/ 0.5901 n.a. n.a. 57.530674 15.028010 65.419199 2024-Oct-31 19:20 22 11 56.84 -38 48 24.9 182.310874 7.338493 n.a. n.a. 0.992796688945 0.4474045 0.00084789767071 1.2795548 100.7069 /T 79.2452 106.8/ 0.5786 n.a. n.a. 57.639690 14.823454 65.217246 2024-Oct-31 19:30 22 12 09.31 -38 39 08.2 184.250891 7.391821 n.a. n.a. 0.992798467733 0.4440255 0.00085302349923 1.2780506 100.8099 /T 79.1420 106.8/ 0.5672 n.a. n.a. 57.759561 14.680677 65.014266 2024-Oct-31 19:40 e 22 12 21.69 -38 29 49.9 186.196239 7.385426 n.a. n.a. 0.992800232997 0.4406445 0.00085814367214 1.2767143 100.9129 /T 79.0387 106.8/ 0.5558 n.a. n.a. 57.887978 14.598093 64.810720 2024-Oct-31 19:50 22 12 34.03 -38 20 30.2 188.144615 7.319193 n.a. n.a. 0.992801984733 0.4372624 0.00086325881186 1.2755209 101.0160 /T 78.9353 106.9/ 0.5444 n.a. n.a. 58.022894 14.573991 64.606975 2024-Oct-31 20:00 22 12 46.38 -38 11 09.2 190.093733 7.193160 n.a. n.a. 0.992803722935 0.4338799 0.00086836944107 1.2744456 101.1194 /T 78.8316 106.9/ 0.5330 n.a. n.a. 58.162504 14.606562 64.403309 2024-Oct-31 20:10 22 12 58.78 -38 01 47.0 192.041344 7.007519 n.a. n.a. 0.992805447606 0.4304977 0.00087347598301 1.2734636 101.2232 /T 78.7275 107.0/ 0.5217 n.a. n.a. 58.305234 14.693920 64.199913 2024-Oct-31 20:20 22 13 11.28 -37 52 23.6 193.985255 6.762607 n.a. n.a. 0.992807158747 0.4271163 0.00087857876193 1.2725503 101.3276 /T 78.6229 107.0/ 0.5104 n.a. n.a. 58.449727 14.834121 63.996895 2024-Oct-31 20:30 22 13 23.92 -37 42 59.3 195.923353 6.458909 n.a. n.a. 0.992808856363 0.4237363 0.00088367800372 1.2716813 101.4325 /T 78.5177 107.0/ 0.4991 n.a. n.a. 58.594823 15.025182 63.794288 2024-Oct-31 20:40 22 13 36.75 -37 33 34.2 197.853620 6.097046 n.a. n.a. 0.992810540462 0.4203584 0.00088877383674 1.2708325 101.5382 /T 78.4118 107.1/ 0.4879 n.a. n.a. 58.739549 15.265091 63.592054 2024-Oct-31 20:50 22 13 49.81 -37 24 08.3 199.774150 5.677769 n.a. n.a. 0.992812211051 0.4169830 0.00089386629286 1.2699798 101.6447 /T 78.3050 107.1/ 0.4768 n.a. n.a. 58.883101 15.551820 63.390091 2024-Oct-31 21:00 22 14 03.12 -37 14 41.9 201.683168 5.201953 n.a. n.a. 0.992813868144 0.4136107 0.00089895530854 1.2690997 101.7521 /T 78.1973 107.1/ 0.4657 n.a. n.a. 59.024826 15.883334 63.188237 2024-Oct-31 21:10 22 14 16.74 -37 05 15.2 203.579036 4.670586 n.a. n.a. 0.992815511753 0.4102418 0.00090404072634 1.2681689 101.8606 /T 78.0886 107.2/ 0.4548 n.a. n.a. 59.164210 16.257598 62.986280 2024-Oct-31 21:20 22 14 30.68 -36 55 48.3 205.460268 4.084758 n.a. n.a. 0.992817141893 0.4068768 0.00090912229632 1.2671647 101.9701 /T 77.9788 107.2/ 0.4439 n.a. n.a. 59.300860 16.672582 62.783960 2024-Oct-31 21:30 22 14 44.99 -36 46 21.3 207.325538 3.445653 n.a. n.a. 0.992818758581 0.4035161 0.00091419967782 1.2660645 102.0807 /T 77.8679 107.2/ 0.4331 n.a. n.a. 59.434493 17.126266 62.580976 2024-Oct-31 21:40 22 14 59.70 -36 36 54.6 209.173681 2.754537 n.a. n.a. 0.992820361834 0.4001599 0.00091927244127 1.2648464 102.1926 /T 77.7557 107.3/ 0.4224 n.a. n.a. 59.564917 17.616644 62.376996 2024-Oct-31 21:50 22 15 14.82 -36 27 28.2 211.003699 2.012746 n.a. n.a. 0.992821951672 0.3968087 0.00092434007019 1.2634892 102.3058 /T 77.6423 107.3/ 0.4118 n.a. n.a. 59.692021 18.141727 62.171656 2024-Oct-31 22:00 22 15 30.39 -36 18 02.3 212.814765 1.221675 n.a. n.a. 0.992823528115 0.3934627 0.00092940196348 1.2619719 102.4204 /T 77.5275 107.3/ 0.4014 n.a. n.a. 59.815760 18.699545 61.964570 2024-Oct-31 22:10 22 15 46.44 -36 08 37.2 214.606214 0.382796 n.a. n.a. 0.992825091644 0.3903486 0.00093445796634 1.2605345 102.5363 /T 77.4113 107.4/ 0.3910 n.a. n.a. 59.952724 19.292466 61.753643 2024-Oct-31 22:20 22 16 02.98 -35 59 12.9 216.377550 -0.502388 n.a. n.a. 0.992826642680 0.3872118 0.00093950776983 1.2588634 102.6537 /T 77.2936 107.4/ 0.3808 n.a. n.a. 60.084013 19.913293 61.540451 >..... 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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ***************************************************************************************************************************************************************************************************************************************************