API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Jun 19, 2025 MMS-3 Spacecraft / (Earth) -140484 https://www.nasa.gov/mission_pages/mms/index.html MMS 3 Magnetospheric Multiscale (MMS) mission: the third 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 Jun 19 11:37:05 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: MMS-3 (spacecraft) (-140484) {source: MMS-3} Center body name: Earth (399) {source: DE441} Center-site name: Swan Reach Imaging, Glenalta ******************************************************************************* 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 : 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.250618.p250914 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-JUN-18. PREDICTS-> 2025-SEP-13 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-Oct-31 09:20 C 21 23 10.08 -45 21 58.9 174.503099 79.222933 n.a. n.a. 0.992728050407 0.5760791 0.00050907410408 2.0928589 90.1373 /T 89.8337 101.1/ 1.3630 n.a. n.a. 134.02017 33.921935 68.492463 2024-Oct-31 09:30 Ct 21 24 19.41 -45 03 37.9 182.976723 79.570647 n.a. n.a. 0.992730349408 0.5752662 0.00051742735756 2.0752447 90.4297 /T 89.5409 101.3/ 1.3454 n.a. n.a. 131.22735 33.275696 68.420674 2024-Oct-31 09:40 Ne 21 25 25.87 -44 45 31.3 191.908079 79.631688 n.a. n.a. 0.992732644689 0.5742294 0.00052571194035 2.0585697 90.7144 /T 89.2557 101.6/ 1.3277 n.a. n.a. 128.65444 32.678931 68.339216 2024-Oct-31 09:50 N 21 26 29.73 -44 27 38.5 200.757478 79.393646 n.a. n.a. 0.992734935395 0.5729887 0.00053393149356 2.0427725 90.9922 /T 88.9774 101.8/ 1.3098 n.a. n.a. 126.28046 32.132497 68.248794 2024-Oct-31 10:00 N 21 27 31.22 -44 09 58.8 209.012426 78.869258 n.a. n.a. 0.992737220747 0.5715619 0.00054208941790 2.0277944 91.2636 /T 88.7055 102.0/ 1.2919 n.a. n.a. 124.08646 31.637004 68.150093 2024-Oct-31 10:10 A 21 28 30.58 -43 52 31.7 216.330953 78.090863 n.a. n.a. 0.992739500032 0.5699653 0.00055018888273 2.0135789 91.5292 /T 88.4394 102.2/ 1.2739 n.a. n.a. 122.05531 31.192817 68.043774 2024-Oct-31 10:20 A 21 29 28.01 -43 35 16.6 222.580340 77.099872 n.a. n.a. 0.992741772603 0.5682136 0.00055823283461 2.0000714 91.7896 /T 88.1786 102.4/ 1.2558 n.a. n.a. 120.17153 30.800065 67.930465 2024-Oct-31 10:30 A 21 30 23.71 -43 18 13.0 227.786982 75.937493 n.a. n.a. 0.992744037865 0.5663200 0.00056622400517 1.9872191 92.0452 /T 87.9225 102.6/ 1.2377 n.a. n.a. 118.42114 30.458649 67.810760 2024-Oct-31 10:40 A 21 31 17.86 -43 01 20.6 232.061945 74.639627 n.a. n.a. 0.992746295276 0.5642965 0.00057416491836 1.9749713 92.2965 /T 87.6708 102.8/ 1.2195 n.a. n.a. 116.79150 30.168263 67.685209 2024-Oct-31 10:50 21 32 10.62 -42 44 39.1 235.543992 73.235356 n.a. n.a. 0.992748544338 0.5621542 0.00058205789747 1.9632787 92.5439 /T 87.4229 103.0/ 1.2013 n.a. n.a. 115.27121 29.928403 67.554320 2024-Oct-31 11:00 21 33 02.13 -42 28 08.1 238.368089 71.747371 n.a. n.a. 0.992750784596 0.5599030 0.00058990507160 1.9520936 92.7878 /T 87.1786 103.2/ 1.1830 n.a. n.a. 113.84998 29.738387 67.418554 2024-Oct-31 11:10 21 33 52.55 -42 11 47.3 240.652310 70.193103 n.a. n.a. 0.992753015634 0.5575520 0.00059770838182 1.9413699 93.0285 /T 86.9374 103.4/ 1.1647 n.a. n.a. 112.51856 29.597376 67.278322 2024-Oct-31 11:20 21 34 42.01 -41 55 36.6 242.494740 68.585911 n.a. n.a. 0.992755237069 0.5551095 0.00060546958716 1.9310630 93.2665 /T 86.6990 103.5/ 1.1464 n.a. n.a. 111.26858 29.504384 67.133986 2024-Oct-31 11:30 21 35 30.62 -41 39 35.6 243.974809 66.936093 n.a. n.a. 0.992757448550 0.5525830 0.00061319027031 1.9211296 93.5020 /T 86.4630 103.7/ 1.1281 n.a. n.a. 110.09255 29.458302 66.985859 2024-Oct-31 11:40 21 36 18.49 -41 23 44.4 245.156102 65.251664 n.a. n.a. 0.992759649757 0.5499795 0.00062087184317 1.9115277 93.7353 /T 86.2293 103.9/ 1.1098 n.a. n.a. 108.98371 29.457912 66.834207 2024-Oct-31 11:50 21 37 05.74 -41 08 02.7 246.089347 63.538947 n.a. n.a. 0.992761840394 0.5473053 0.00062851555213 1.9022168 93.9667 /T 85.9975 104.1/ 1.0916 n.a. n.a. 107.93600 29.501899 66.679244 2024-Oct-31 12:00 21 37 52.44 -40 52 30.5 246.815047 61.803001 n.a. n.a. 0.992764020191 0.5445664 0.00063612248345 1.8931575 94.1964 /T 85.7674 104.2/ 1.0733 n.a. n.a. 106.94399 29.588870 66.521142 2024-Oct-31 12:10 21 38 38.71 -40 37 07.6 247.365663 60.047932 n.a. n.a. 0.992766188899 0.5417680 0.00064369356827 1.8843118 94.4246 /T 85.5387 104.4/ 1.0552 n.a. n.a. 106.00278 29.717365 66.360028 2024-Oct-31 12:20 21 39 24.60 -40 21 54.0 247.767334 58.277128 n.a. n.a. 0.992768346293 0.5389151 0.00065122958771 1.8756430 94.6516 /T 85.3112 104.5/ 1.0371 n.a. n.a. 105.10801 29.885869 66.195987 2024-Oct-31 12:30 21 40 10.21 -40 06 49.7 248.041228 56.493420 n.a. n.a. 0.992770492162 0.5360123 0.00065873117790 1.8671155 94.8776 /T 85.0849 104.7/ 1.0190 n.a. n.a. 104.25574 30.092824 66.029068 2024-Oct-31 12:40 21 40 55.60 -39 51 54.5 248.204583 54.699217 n.a. n.a. 0.992772626315 0.5330636 0.00066619883486 1.8586949 95.1027 /T 84.8593 104.8/ 1.0010 n.a. n.a. 103.44247 30.336636 65.859281 2024-Oct-31 12:50 21 41 40.82 -39 37 08.7 248.271518 52.896591 n.a. n.a. 0.992774748579 0.5300731 0.00067363291936 1.8503482 95.3271 /T 84.6345 105.0/ 0.9832 n.a. n.a. 102.66502 30.615686 65.686607 2024-Oct-31 13:00 21 42 25.95 -39 22 32.0 248.253653 51.087353 n.a. n.a. 0.992776858791 0.5270441 0.00068103366193 1.8420434 95.5509 /T 84.4103 105.1/ 0.9654 n.a. n.a. 101.92057 30.928339 65.510997 2024-Oct-31 13:10 21 43 11.04 -39 08 04.6 248.160604 49.273106 n.a. n.a. 0.992778956807 0.5239800 0.00068840116748 1.8337499 95.7744 /T 84.1865 105.3/ 0.9477 n.a. n.a. 101.20655 31.272949 65.332376 2024-Oct-31 13:20 21 43 56.12 -38 53 46.4 248.000353 47.455288 n.a. n.a. 0.992781042491 0.5208839 0.00069573542027 1.8254382 95.9975 /T 83.9629 105.4/ 0.9302 n.a. n.a. 100.52067 31.647863 65.150647 2024-Oct-31 13:30 21 44 41.25 -38 39 37.5 247.779557 45.635201 n.a. n.a. 0.992783115722 0.5177584 0.00070303628867 1.8170799 96.2204 /T 83.7396 105.6/ 0.9128 n.a. n.a. 99.860836 32.051431 64.965693 2024-Oct-31 13:40 21 45 26.46 -38 25 37.9 247.503776 43.814042 n.a. n.a. 0.992785176388 0.5146063 0.00071030352993 1.8086480 96.4432 /T 83.5164 105.7/ 0.8955 n.a. n.a. 99.225162 32.482011 64.777382 2024-Oct-31 13:50 21 46 11.80 -38 11 47.7 247.177666 41.992923 n.a. n.a. 0.992787224387 0.5114300 0.00071753679498 1.8001165 96.6660 /T 83.2932 105.9/ 0.8784 n.a. n.a. 98.611918 32.937970 64.585567 2024-Oct-31 14:00 21 46 57.29 -37 58 07.0 246.805130 40.172885 n.a. n.a. 0.992789259627 0.5082315 0.00072473563319 1.7914607 96.8889 /T 83.0699 106.0/ 0.8614 n.a. n.a. 98.019522 33.417688 64.390093 2024-Oct-31 14:10 21 47 42.96 -37 44 35.6 246.389447 38.354918 n.a. n.a. 0.992791282200 0.5051001 0.00073189977083 1.7827913 97.1119 /T 82.8465 106.1/ 0.8446 n.a. n.a. 97.455197 33.920194 64.190478 2024-Oct-31 14:20 21 48 28.84 -37 31 13.8 245.933362 36.539968 n.a. n.a. 0.992793292196 0.5019460 0.00073902880452 1.7739369 97.3351 /T 82.6230 106.3/ 0.8280 n.a. n.a. 96.908095 34.443181 63.986846 2024-Oct-31 14:30 21 49 14.96 -37 18 01.4 245.439145 34.728943 n.a. n.a. 0.992795289524 0.4987703 0.00074612194595 1.7648755 97.5585 /T 82.3991 106.4/ 0.8116 n.a. n.a. 96.376957 34.985102 63.779018 2024-Oct-31 14:40 21 50 01.32 -37 04 58.7 244.908677 32.922722 n.a. n.a. 0.992797274103 0.4955744 0.00075317832290 1.7555868 97.7822 /T 82.1750 106.6/ 0.7954 n.a. n.a. 95.860618 35.544438 63.566812 2024-Oct-31 14:50 21 50 47.95 -36 52 05.6 244.343501 31.122169 n.a. n.a. 0.992799245853 0.4923594 0.00076019698430 1.7460520 98.0063 /T 81.9506 106.7/ 0.7793 n.a. n.a. 95.357974 36.119703 63.350050 2024-Oct-31 15:00 21 51 34.86 -36 39 22.2 243.744866 29.328135 n.a. n.a. 0.992801204702 0.4891267 0.00076717690533 1.7362530 98.2306 /T 81.7259 106.9/ 0.7635 n.a. n.a. 94.867973 36.709443 63.128557 2024-Oct-31 15:10 21 52 22.06 -36 26 48.5 243.113768 27.541467 n.a. n.a. 0.992803150581 0.4858772 0.00077411699260 1.7261736 98.4553 /T 81.5008 107.0/ 0.7479 n.a. n.a. 94.389597 37.312241 62.902162 2024-Oct-31 15:20 21 53 09.55 -36 14 24.7 242.450975 25.763007 n.a. n.a. 0.992805083425 0.4826120 0.00078101608907 1.7157985 98.6803 /T 81.2754 107.1/ 0.7325 n.a. n.a. 93.921865 37.926715 62.670703 2024-Oct-31 15:30 21 53 57.35 -36 02 10.8 241.757055 23.993606 n.a. n.a. 0.992807003174 0.4793322 0.00078787297917 1.7051136 98.9057 /T 81.0497 107.3/ 0.7173 n.a. n.a. 93.463814 38.551526 62.434023 2024-Oct-31 15:40 21 54 45.45 -35 50 06.8 241.032399 22.234120 n.a. n.a. 0.992808909771 0.4760386 0.00079468639387 1.6941063 99.1314 /T 80.8236 107.4/ 0.7023 n.a. n.a. 93.014500 39.185372 62.191977 2024-Oct-31 15:50 21 55 33.86 -35 38 12.8 240.277236 20.485420 n.a. n.a. 0.992810803164 0.4727321 0.00080145501549 1.6827651 99.3574 /T 80.5972 107.6/ 0.6876 n.a. n.a. 92.572991 39.826993 61.944428 2024-Oct-31 16:00 21 56 22.58 -35 26 28.9 239.491652 18.748394 n.a. n.a. 0.992812683303 0.4694137 0.00080817748282 1.6710796 99.5838 /T 80.3705 107.7/ 0.6732 n.a. n.a. 92.138362 40.475174 61.691251 2024-Oct-31 16:10 21 57 11.60 -35 14 54.9 238.675601 17.023949 n.a. n.a. 0.992814550142 0.4660842 0.00081485239589 1.6590409 99.8104 /T 80.1436 107.8/ 0.6589 n.a. n.a. 91.709693 41.128741 61.432333 2024-Oct-31 16:20 21 58 00.92 -35 03 31.1 237.828918 15.313018 n.a. n.a. 0.992816403639 0.4627443 0.00082147832084 1.6466412 100.0372 /T 79.9164 108.0/ 0.6450 n.a. n.a. 91.286065 41.786565 61.167573 2024-Oct-31 16:30 21 58 50.54 -34 52 17.5 236.951328 13.616565 n.a. n.a. 0.992818243754 0.4593949 0.00082805379472 1.6338736 100.2643 /T 79.6890 108.1/ 0.6312 n.a. n.a. 90.866557 42.447563 60.896881 2024-Oct-31 16:40 21 59 40.44 -34 41 13.9 236.042456 11.935582 n.a. n.a. 0.992820070450 0.4560368 0.00083457733027 1.6207327 100.4915 /T 79.4614 108.3/ 0.6178 n.a. n.a. 90.450250 43.110697 60.620183 2024-Oct-31 16:50 22 00 30.62 -34 30 20.6 235.101837 10.271100 n.a. n.a. 0.992821883695 0.4526707 0.00084104742042 1.6072143 100.7189 /T 79.2337 108.4/ 0.6045 n.a. n.a. 90.036220 43.774973 60.337417 2024-Oct-31 17:00 22 01 21.08 -34 19 37.5 234.128918 8.624190 n.a. n.a. 0.992823683459 0.4492973 0.00084746254310 1.5933150 100.9463 /T 79.0059 108.5/ 0.5916 n.a. n.a. 89.623542 44.439444 60.048534 2024-Oct-31 17:10 22 02 11.79 -34 09 04.5 233.123073 6.995965 n.a. n.a. 0.992825469713 0.4459173 0.00085382116557 1.5790328 101.1738 /T 78.7781 108.7/ 0.5789 n.a. n.a. 89.211289 45.103207 59.753499 2024-Oct-31 17:20 22 03 02.75 -33 58 41.8 232.083605 5.387587 n.a. n.a. 0.992827242434 0.4425316 0.00086012174904 1.5643668 101.4013 /T 78.5503 108.8/ 0.5665 n.a. n.a. 88.798533 45.765403 59.452290 2024-Oct-31 17:30 22 03 53.94 -33 48 29.3 231.009755 3.800266 n.a. n.a. 0.992829001599 0.4391406 0.00086636275290 1.5493169 101.6287 /T 78.3226 109.0/ 0.5543 n.a. n.a. 88.384345 46.425220 59.144899 2024-Oct-31 17:40 22 04 45.36 -33 38 27.0 229.900709 2.235269 n.a. n.a. 0.992830747190 0.4357453 0.00087254263905 1.5338844 101.8559 /T 78.0950 109.1/ 0.5424 n.a. n.a. 87.967797 47.081885 58.831332 2024-Oct-31 17:50 22 05 36.97 -33 28 34.9 228.755609 0.693919 n.a. n.a. 0.992832479190 0.4323461 0.00087865987612 1.5180714 102.0830 /T 77.8677 109.3/ 0.5308 n.a. n.a. 87.547963 47.734671 58.511606 >..... 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 ***************************************************************************************************************************************************************************************************************************************************