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 Wed Apr 23 18:14:47 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: VdS Remote Observatory, Hakos ******************************************************************************* 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 : 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: 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.250423.p250719 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-APR-23. PREDICTS-> 2025-JUL-18 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 09 25 59.63 +06 11 17.6 82.703210 1.553683 n.a. n.a. 0.981730098542 -3.0005941 0.05120873345243 -4.3407561 75.9994 /L 101.0984 59.7/ 2.0498 n.a. n.a. 8.1226234 121.38363 -40.80581 2024-Oct-31 00:10 09 26 04.27 +06 10 35.4 81.717914 3.823028 n.a. n.a. 0.981718061474 -3.0017182 0.05119133216709 -4.3371514 75.9846 /L 101.1144 59.8/ 2.0246 n.a. n.a. 8.1027900 121.49810 -40.86119 2024-Oct-31 00:20 09 26 08.90 +06 09 53.2 80.716887 6.086794 n.a. n.a. 0.981706019898 -3.0028422 0.05117394692746 -4.3327547 75.9699 /L 101.1302 59.9/ 1.9998 n.a. n.a. 8.0831680 121.61347 -40.91081 2024-Oct-31 00:30 09 26 13.51 +06 09 10.9 79.696887 8.344194 n.a. n.a. 0.981693973813 -3.0039662 0.05115658090085 -4.3275708 75.9552 /L 101.1461 59.9/ 1.9753 n.a. n.a. 8.0638046 121.72954 -40.95450 2024-Oct-31 00:40 09 26 18.11 +06 08 28.6 78.654515 10.594379 n.a. n.a. 0.981681923221 -3.0050903 0.05113923723271 -4.3216057 75.9406 /L 101.1618 60.0/ 1.9512 n.a. n.a. 8.0447463 121.84607 -40.99211 2024-Oct-31 00:50 09 26 22.69 +06 07 46.2 77.586178 12.836430 n.a. n.a. 0.981669868120 -3.0062143 0.05112191904068 -4.3148672 75.9260 /L 101.1775 60.1/ 1.9275 n.a. n.a. 8.0260388 121.96283 -41.02349 2024-Oct-31 01:00 09 26 27.25 +06 07 03.8 76.488049 15.069348 n.a. n.a. 0.981657808512 -3.0073383 0.05110462940873 -4.3073644 75.9116 /L 101.1931 60.2/ 1.9041 n.a. n.a. 8.0077272 122.07959 -41.04852 2024-Oct-31 01:10 09 26 31.79 +06 06 21.4 75.356020 17.292035 n.a. n.a. 0.981645744396 -3.0084623 0.05108737138142 -4.2991078 75.8971 /L 101.2087 60.3/ 1.8811 n.a. n.a. 7.9898555 122.19610 -41.06706 2024-Oct-31 01:20 09 26 36.32 +06 05 38.9 74.185656 19.503282 n.a. n.a. 0.981633675772 -3.0095864 0.05107014795797 -4.2901095 75.8828 /L 101.2242 60.3/ 1.8585 n.a. n.a. 7.9724668 122.31213 -41.07900 2024-Oct-31 01:30 09 26 40.84 +06 04 56.3 72.972139 21.701747 n.a. n.a. 0.981621602640 -3.0107104 0.05105296208682 -4.2803828 75.8684 /L 101.2396 60.4/ 1.8362 n.a. n.a. 7.9556032 122.42743 -41.08423 2024-Oct-31 01:40 09 26 45.34 +06 04 13.8 71.710212 23.885939 n.a. n.a. 0.981609525000 -3.0118344 0.05103581665997 -4.2699424 75.8542 /L 101.2550 60.5/ 1.8144 n.a. n.a. 7.9393057 122.54175 -41.08265 2024-Oct-31 01:50 09 26 49.82 +06 03 31.1 70.394111 26.054186 n.a. n.a. 0.981597442853 -3.0129584 0.05101871450750 -4.2588046 75.8400 /L 101.2703 60.6/ 1.7929 n.a. n.a. 7.9236138 122.65484 -41.07419 2024-Oct-31 02:00 09 26 54.29 +06 02 48.5 69.017498 28.204611 n.a. n.a. 0.981585356198 -3.0140824 0.05100165839228 -4.2469866 75.8258 /L 101.2856 60.7/ 1.7719 n.a. n.a. 7.9085660 122.76645 -41.05876 2024-Oct-31 02:10 09 26 58.75 +06 02 05.7 67.573379 30.335100 n.a. n.a. 0.981573265035 -3.0152063 0.05098465100475 -4.2345072 75.8117 /L 101.3008 60.7/ 1.7512 n.a. n.a. 7.8941994 122.87633 -41.03632 2024-Oct-31 02:20 09 27 03.19 +06 01 23.0 66.054021 32.443257 n.a. n.a. 0.981561169365 -3.0163303 0.05096769495779 -4.2213864 75.7976 /L 101.3160 60.8/ 1.7310 n.a. n.a. 7.8805496 122.98423 -41.00681 2024-Oct-31 02:30 09 27 07.62 +06 00 40.1 64.450866 34.526363 n.a. n.a. 0.981549069187 -3.0174543 0.05095079278187 -4.2076453 75.7836 /L 101.3311 60.9/ 1.7111 n.a. n.a. 7.8676508 123.08991 -40.97020 2024-Oct-31 02:40 09 27 12.03 +05 59 57.2 62.754435 36.581323 n.a. n.a. 0.981536964502 -3.0185783 0.05093394692018 -4.1933063 75.7696 /L 101.3462 60.9/ 1.6917 n.a. n.a. 7.8555358 123.19312 -40.92647 2024-Oct-31 02:50 A 09 27 16.44 +05 59 14.3 60.954239 38.604601 n.a. n.a. 0.981524855309 -3.0197022 0.05091715972409 -4.1783927 75.7557 /L 101.3613 61.0/ 1.6727 n.a. n.a. 7.8442355 123.29362 -40.87561 2024-Oct-31 03:00 A 09 27 20.83 +05 58 31.3 59.038699 40.592155 n.a. n.a. 0.981512741609 -3.0208262 0.05090043344867 -4.1629292 75.7417 /L 101.3763 61.1/ 1.6540 n.a. n.a. 7.8337796 123.39117 -40.81763 2024-Oct-31 03:10 A 09 27 25.22 +05 57 48.3 56.995078 42.539352 n.a. n.a. 0.981500623401 -3.0219502 0.05088377024841 -4.1469414 75.7279 /L 101.3912 61.1/ 1.6358 n.a. n.a. 7.8241958 123.48554 -40.75256 2024-Oct-31 03:20 Nm 09 27 29.59 +05 57 05.2 54.809458 44.440878 n.a. n.a. 0.981488500687 -3.0230741 0.05086717217319 -4.1304558 75.7140 /L 101.4062 61.2/ 1.6180 n.a. n.a. 7.8155103 123.57650 -40.68043 2024-Oct-31 03:30 Nm 09 27 33.96 +05 56 22.0 52.466763 46.290642 n.a. n.a. 0.981476373465 -3.0241981 0.05085064116436 -4.1135000 75.7002 /L 101.4210 61.3/ 1.6006 n.a. n.a. 7.8077476 123.66384 -40.60129 2024-Oct-31 03:40 Nm 09 27 38.31 +05 55 38.8 49.950884 48.081666 n.a. n.a. 0.981464241735 -3.0253220 0.05083417905115 -4.0961023 75.6864 /L 101.4359 61.3/ 1.5835 n.a. n.a. 7.8009304 123.74734 -40.51522 2024-Oct-31 03:50 Cm 09 27 42.66 +05 54 55.6 47.244932 49.805978 n.a. n.a. 0.981452105499 -3.0264459 0.05081778754707 -4.0782920 75.6726 /L 101.4508 61.4/ 1.5669 n.a. n.a. 7.7950795 123.82680 -40.42230 2024-Oct-31 04:00 Cm 09 27 47.00 +05 54 12.2 44.331686 51.454514 n.a. n.a. 0.981439964755 -3.0275699 0.05080146824681 -4.0600992 75.6589 /L 101.4656 61.4/ 1.5507 n.a. n.a. 7.7902141 123.90203 -40.32262 >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2024-Nov-01 00:00 09 37 44.39 +04 23 06.7 85.133359 0.493466 n.a. n.a. 0.979950356038 -3.1624054 0.04902713297455 -4.0549612 73.6746 /L 103.5724 67.8/ 0.2674 n.a. n.a. 8.9246123 121.65528 -37.47758 $$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 ***************************************************************************************************************************************************************************************************************************************************