API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Oct 20, 2022 Lucy Centaur RB Booster (spacecraft) / Sun -490 BACKGROUND: This trajectory solution is for the Lucy spacecraft Centaur stage and includes measurements from the 2022 flyby recovery by ATLAS (W68). The close approach was 2022-Oct-16 06:58:47 UTC, 9097.287 from the geocenter over the North Atlantic (299.531798 deg. E, 27.065258 deg. N), a point about 683 km SSE of Bermuda, 1985 km east of the Cape Canaveral launch site. The next Earth approach is expected to be 2024-Nov-08, at 0.04 au. "-490" is an unofficial SPK ID number and may be changed in the future The Lucy spacecraft itself is accessed under spacecraft ID -49. Launched: October 16, 2021 @ 09:34 UTC DESCRIPTION: This solution #57 includes a spinning gas jet model based on a fit to 92 ground-based optical measurements over 2021-Oct-20.9 to 2022-Oct-19.1. Developed by D. Farnocchia (JPL) 2022-Oct-19. Heliocentric IAU76/J2000 ecliptic osculating elements (au, days and degrees): EPOCH= 2459532.5 EC= .1620613117287741 QR= .8378114070561726 TP= 2459422.963016516633 OM= 201.9690340568685 W = 82.5604601618937 IN= .1344952893048388 H= 26.756 RMSH= .34288 Non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= 0. DT= 0. A1= 0. A2= 0. A3= 0. AJ1= 1.776971075868233E-8 ET1= 82.89783500070268 ALF= 152.0807777094847 DEL= 76.12952671882672 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. EOBL_LIM= .01 SOBL_LIM= 0. Name Start (TDB) End (TDB) ------------------- ----------------- ----------------- 2021-093B-57_1 2021-Oct-20 00:00 2022-Oct-11 00:00 2021-093B-57_2 2022-Oct-11 00:00 2022-Oct-21 00:00 2021-093B-57_3 2022-Oct-21 00:00 2050-Jan-03 00:00 ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu May 15 06:38:01 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lucy Centaur RB Booster (spacecraft) (-490) {source: Lucy_centaur_s57_DE440} Center body name: Earth (399) {source: Lucy_centaur_s57_DE440} Center-site name: iTelescope Obs.,Beryl Junc. (Sato) ******************************************************************************* 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 : 246.3025, 37.7377919, 1.56349 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 246.3025,5051.53114,3883.42609 {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: Lucy_centaur_s57_DE4 Rel. light bend : Sun {source: Lucy_centaur_s57_DE4 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.250514.p250810 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-MAY-14. PREDICTS-> 2025-AUG-09 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 .....< 2024-Oct-31 08:10 09 29 51.29 +05 32 43.4 83.339368 0.285915 n.a. n.a. 0.981134981717 -3.0556666 0.05044860456859 -4.1877928 75.2341 /L 101.9149 62.5/ 1.2325 n.a. n.a. 8.4698653 121.27080 -39.03586 2024-Oct-31 08:20 09 29 56.14 +05 31 59.5 84.866693 2.234475 n.a. n.a. 0.981122723771 -3.0567904 0.05043181197006 -4.1865792 75.2184 /L 101.9318 62.6/ 1.2133 n.a. n.a. 8.4530575 121.36467 -39.09276 2024-Oct-31 08:30 09 30 00.97 +05 31 15.6 86.390133 4.187791 n.a. n.a. 0.981110461317 -3.0579142 0.05041502561633 -4.1846784 75.2026 /L 101.9486 62.7/ 1.1944 n.a. n.a. 8.4362865 121.45972 -39.14506 2024-Oct-31 08:40 09 30 05.79 +05 30 31.7 87.913232 6.144462 n.a. n.a. 0.981098194355 -3.0590380 0.05039824826361 -4.1820904 75.1870 /L 101.9654 62.8/ 1.1757 n.a. n.a. 8.4195944 121.55577 -39.19260 2024-Oct-31 08:50 09 30 10.59 +05 29 47.7 89.439579 8.103092 n.a. n.a. 0.981085922887 -3.0601618 0.05038148266622 -4.1788163 75.1714 /L 101.9821 62.8/ 1.1573 n.a. n.a. 8.4030229 121.65266 -39.23525 2024-Oct-31 09:00 09 30 15.38 +05 29 03.7 90.972830 10.062279 n.a. n.a. 0.981073646912 -3.0612856 0.05036473157139 -4.1748585 75.1558 /L 101.9988 62.9/ 1.1391 n.a. n.a. 8.3866137 121.75019 -39.27286 2024-Oct-31 09:10 09 30 20.15 +05 28 19.6 92.516736 12.020602 n.a. n.a. 0.981061366429 -3.0624094 0.05034799771403 -4.1702207 75.1403 /L 102.0154 63.0/ 1.1213 n.a. n.a. 8.3704078 121.84818 -39.30529 2024-Oct-31 09:20 09 30 24.91 +05 27 35.6 94.075166 13.976609 n.a. n.a. 0.981049081439 -3.0635332 0.05033128381174 -4.1649078 75.1249 /L 102.0320 63.1/ 1.1037 n.a. n.a. 8.3544458 121.94644 -39.33242 2024-Oct-31 09:30 09 30 29.65 +05 26 51.4 95.652139 15.928805 n.a. n.a. 0.981036791942 -3.0646569 0.05031459255952 -4.1589262 75.1095 /L 102.0485 63.2/ 1.0864 n.a. n.a. 8.3387678 122.04479 -39.35413 2024-Oct-31 09:40 09 30 34.38 +05 26 07.3 97.251854 17.875631 n.a. n.a. 0.981024497939 -3.0657807 0.05029792662491 -4.1522832 75.0941 /L 102.0649 63.3/ 1.0693 n.a. n.a. 8.3234133 122.14301 -39.37031 2024-Oct-31 09:50 09 30 39.10 +05 25 23.1 98.878720 19.815455 n.a. n.a. 0.981012199428 -3.0669045 0.05028128864278 -4.1449878 75.0788 /L 102.0813 63.3/ 1.0526 n.a. n.a. 8.3084208 122.24092 -39.38085 2024-Oct-31 10:00 09 30 43.81 +05 24 38.8 100.537391 21.746552 n.a. n.a. 0.980999896410 -3.0680282 0.05026468121046 -4.1370498 75.0636 /L 102.0977 63.4/ 1.0362 n.a. n.a. 8.2938285 122.33830 -39.38566 2024-Oct-31 10:10 09 30 48.50 +05 23 54.6 102.232801 23.667084 n.a. n.a. 0.980987588886 -3.0691520 0.05024810688286 -4.1284804 75.0484 /L 102.1140 63.5/ 1.0200 n.a. n.a. 8.2796733 122.43497 -39.38466 2024-Oct-31 10:20 09 30 53.17 +05 23 10.2 103.970203 25.575082 n.a. n.a. 0.980975276855 -3.0702757 0.05023156816761 -4.1192920 75.0332 /L 102.1302 63.6/ 1.0042 n.a. n.a. 8.2659913 122.53072 -39.37778 2024-Oct-31 10:30 09 30 57.84 +05 22 25.9 105.755203 27.468419 n.a. n.a. 0.980962960317 -3.0713995 0.05021506752041 -4.1094981 75.0181 /L 102.1465 63.6/ 0.9886 n.a. n.a. 8.2528179 122.62533 -39.36494 2024-Oct-31 10:40 09 31 02.49 +05 21 41.4 107.593805 29.344790 n.a. n.a. 0.980950639272 -3.0725232 0.05019860734032 -4.0991135 75.0030 /L 102.1626 63.7/ 0.9734 n.a. n.a. 8.2401870 122.71861 -39.34610 2024-Oct-31 10:50 09 31 07.13 +05 20 57.0 109.492440 31.201676 n.a. n.a. 0.980938313721 -3.0736469 0.05018218996534 -4.0881539 74.9880 /L 102.1787 63.8/ 0.9584 n.a. n.a. 8.2281316 122.81036 -39.32121 2024-Oct-31 11:00 09 31 11.76 +05 20 12.5 111.458010 33.036320 n.a. n.a. 0.980925983663 -3.0747707 0.05016581766788 -4.0766362 74.9730 /L 102.1948 63.9/ 0.9438 n.a. n.a. 8.2166837 122.90037 -39.29025 2024-Oct-31 11:10 09 31 16.38 +05 19 27.9 113.497911 34.845685 n.a. n.a. 0.980913649099 -3.0758944 0.05014949265055 -4.0645783 74.9581 /L 102.2109 63.9/ 0.9295 n.a. n.a. 8.2058738 122.98845 -39.25318 2024-Oct-31 11:20 09 31 20.99 +05 18 43.3 115.620059 36.626420 n.a. n.a. 0.980901310028 -3.0770181 0.05013321704206 -4.0519992 74.9432 /L 102.2269 64.0/ 0.9155 n.a. n.a. 8.1957313 123.07438 -39.21000 2024-Oct-31 11:30 09 31 25.59 +05 17 58.7 117.832893 38.374818 n.a. n.a. 0.980888966451 -3.0781418 0.05011699289309 -4.0389188 74.9283 /L 102.2428 64.1/ 0.9018 n.a. n.a. 8.1862842 123.15799 -39.16072 2024-Oct-31 11:40 09 31 30.17 +05 17 14.0 120.145367 40.086768 n.a. n.a. 0.980876618367 -3.0792655 0.05010082217250 -4.0253580 74.9134 /L 102.2588 64.1/ 0.8884 n.a. n.a. 8.1775592 123.23908 -39.10535 2024-Oct-31 11:50 09 31 34.75 +05 16 29.2 122.566902 41.757709 n.a. n.a. 0.980864265777 -3.0803892 0.05008470676357 -4.0113385 74.8986 /L 102.2747 64.2/ 0.8752 n.a. n.a. 8.1695816 123.31747 -39.04392 2024-Oct-31 12:00 09 31 39.32 +05 15 44.4 125.107303 43.382583 n.a. n.a. 0.980851908680 -3.0815129 0.05006864846054 -3.9968830 74.8838 /L 102.2906 64.3/ 0.8624 n.a. n.a. 8.1623753 123.39296 -38.97647 2024-Oct-31 12:10 09 31 43.89 +05 14 59.6 127.776622 44.955790 n.a. n.a. 0.980839547077 -3.0826366 0.05005264896507 -3.9820150 74.8690 /L 102.3064 64.3/ 0.8500 n.a. n.a. 8.1559626 123.46540 -38.90305 2024-Oct-31 12:20 09 31 48.44 +05 14 14.7 130.584942 46.471142 n.a. n.a. 0.980827180968 -3.0837603 0.05003670988319 -3.9667588 74.8542 /L 102.3222 64.4/ 0.8378 n.a. n.a. 8.1503646 123.53461 -38.82374 2024-Oct-31 12:30 09 31 52.99 +05 13 29.7 133.542077 47.921836 n.a. n.a. 0.980814810353 -3.0848840 0.05002083272218 -3.9511393 74.8395 /L 102.3380 64.4/ 0.8258 n.a. n.a. 8.1456005 123.60042 -38.73860 2024-Oct-31 12:40 A 09 31 57.54 +05 12 44.7 136.657154 49.300437 n.a. n.a. 0.980802435231 -3.0860077 0.05000501888775 -3.9351821 74.8248 /L 102.3538 64.5/ 0.8142 n.a. n.a. 8.1416883 123.66269 -38.64774 2024-Oct-31 12:50 A 09 32 02.07 +05 11 59.7 139.938074 50.598890 n.a. n.a. 0.980790055604 -3.0871313 0.04998926968140 -3.9189136 74.8101 /L 102.3696 64.6/ 0.8029 n.a. n.a. 8.1386442 123.72126 -38.55126 2024-Oct-31 13:00 A 09 32 06.61 +05 11 14.6 143.390840 51.808567 n.a. n.a. 0.980777671470 -3.0882550 0.04997358629792 -3.9023607 74.7954 /L 102.3853 64.6/ 0.7919 n.a. n.a. 8.1364830 123.77601 -38.44929 2024-Oct-31 13:10 Nm 09 32 11.14 +05 10 29.4 147.018753 52.920361 n.a. n.a. 0.980765282830 -3.0893787 0.04995796982324 -3.8855507 74.7807 /L 102.4011 64.7/ 0.7811 n.a. n.a. 8.1352178 123.82680 -38.34195 2024-Oct-31 13:20 Nm 09 32 15.67 +05 09 44.2 150.821528 53.924841 n.a. n.a. 0.980752889684 -3.0905023 0.04994242123229 -3.8685117 74.7660 /L 102.4168 64.7/ 0.7707 n.a. n.a. 8.1348601 123.87351 -38.22939 2024-Oct-31 13:30 Nm 09 32 20.19 +05 08 58.9 154.794377 54.812473 n.a. n.a. 0.980740492032 -3.0916260 0.04992694138718 -3.8512718 74.7513 /L 102.4325 64.8/ 0.7605 n.a. n.a. 8.1354198 123.91604 -38.11177 2024-Oct-31 13:40 Cm 09 32 24.71 +05 08 13.6 158.927185 55.573916 n.a. n.a. 0.980728089873 -3.0927496 0.04991153103563 -3.8338599 74.7366 /L 102.4483 64.8/ 0.7506 n.a. n.a. 8.1369052 123.95429 -37.98927 2024-Oct-31 13:50 Cm 09 32 29.24 +05 07 28.2 163.203910 56.200381 n.a. n.a. 0.980715683209 -3.0938732 0.04989619080953 -3.8163051 74.7219 /L 102.4640 64.9/ 0.7409 n.a. n.a. 8.1393230 123.98818 -37.86208 >..... Daylight Cut-off Requested .....< >..... 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 ***************************************************************************************************************************************************************************************************************************************************