API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Dec 04, 2024 Euclid Observatory (spacecraft) -680 https://www.esa.int/Science_Exploration/Space_Science/Euclid BACKGROUND: Euclid was built and operated by the European Space Agency with contributions from NASA. It launched July 01, 2023 @ 15:12 UTC on a SpaceX Falcon 9 from Cape Canaveral, Florida, USA. After a one-month transit, its operational orbit will halo around the Earth-Sun Lagrange point 2 (L2), at an average distance of 1.5 million km from Earth. This location keeps pace with Earth as it orbits the Sun (and also hosts ESA's Gaia and NASA's James Webb space telescopes, among others). Nominal mission lifetime is six years, with the possibility of extension (limited by the amount of cold gas used for propulsion). MISSION: Euclid is a cosmology survey mission, optimised to determine the properties of dark energy and dark matter on universal scales to address key questions: - What is the structure and history of the cosmic web? - What is the nature of dark matter? - How has the expansion of the Universe changed over time? - What is the nature of dark energy? - Is our understanding of gravity complete? In addition, Euclid will perform near-infrared spectroscopy of hundreds of millions of galaxies and stars. This will allow investigation of the chemical and kinematical properties of many targets in detail. Euclid's image quality will be at least four times sharper than that achieved by ground-based sky surveys. SPACECRAFT: 4.7m tall, 3.7 m diameter Two major components: service and payload modules Service module 850 kg Payload module 800 kg Propellant 210 kg Balancing mass 40 kg Service module contains: electric power generation and distribution attitude control data processing electronics propulsion telecommand and telemetry thermal control SCIENCE INSTRUMENTS (payload module): - 1.2-m diameter telescope - Visible-wavelength camera (the VISible instrument, VIS) - Near-Infrared Spectrometer and Photometer, NISP). SPACECRAFT TRAJECTORY From ESA 2024-Nov-25, predicts thereafter Trajectory name Start Stop -------------------------------------------- ----------- ----------- euclid_flp_00061_20230701_20310907_v01 2023-Jul-01 2031-Sep-07 ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu Dec 12 02:51:01 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Euclid (spacecraft) (-680) {source: Euclid_current} Center body name: Earth (399) {source: DE441} Center-site name: iTelescope Obs., Siding Spring ******************************************************************************* 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 : 149.0644, -31.2733577, 1.16499 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 149.0644,5457.31536,-3292.4397 {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.241211.p250309 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-DEC-11. PREDICTS-> 2025-MAR-08 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-Nov-30 11:20 06 34 26.54 +27 31 23.5 56.537645 1.036170 n.a. n.a. 0.995336829994 -0.1770594 0.01046791238327 -0.2509350 150.4501 /L 29.2528 141.3/ 0.7879 n.a. n.a. 2.4374004 19.652187 -39.13201 2024-Nov-30 11:30 06 34 27.10 +27 31 46.4 55.192027 2.804158 n.a. n.a. 0.995336119969 -0.1770009 0.01046691695380 -0.2453650 150.4546 /L 29.2484 141.4/ 0.7721 n.a. n.a. 2.3756572 16.912152 -39.22492 2024-Nov-30 11:40 06 34 27.57 +27 32 09.0 53.806771 4.543237 n.a. n.a. 0.995335410179 -0.1769424 0.01046594511404 -0.2391730 150.4594 /L 29.2436 141.5/ 0.7565 n.a. n.a. 2.3176655 14.102215 -39.20393 2024-Nov-30 11:50 06 34 27.94 +27 32 31.4 52.379776 6.251493 n.a. n.a. 0.995334700624 -0.1768840 0.01046499933569 -0.2323706 150.4646 /L 29.2385 141.6/ 0.7409 n.a. n.a. 2.2635149 11.229794 -39.06042 2024-Nov-30 12:00 06 34 28.22 +27 32 53.4 50.908931 7.926894 n.a. n.a. 0.995333991303 -0.1768255 0.01046408204132 -0.2249707 150.4701 /L 29.2331 141.7/ 0.7255 n.a. n.a. 2.2132487 8.3036509 -38.78561 2024-Nov-30 12:10 06 34 28.41 +27 33 15.2 49.392132 9.567280 n.a. n.a. 0.995333282216 -0.1767670 0.01046319559970 -0.2169873 150.4760 /L 29.2273 141.9/ 0.7101 n.a. n.a. 2.1668598 5.3337692 -38.37060 2024-Nov-30 12:20 06 34 28.52 +27 33 36.6 47.827301 11.170363 n.a. n.a. 0.995332573364 -0.1767086 0.01046234232121 -0.2084354 150.4822 /L 29.2212 142.0/ 0.6950 n.a. n.a. 2.1242892 2.3311572 -37.80645 2024-Nov-30 12:30 06 34 28.53 +27 33 57.6 46.212406 12.733719 n.a. n.a. 0.995331864746 -0.1766501 0.01046152445342 -0.1993313 150.4887 /L 29.2147 142.1/ 0.6799 n.a. n.a. 2.0854240 359.30760 -37.08430 2024-Nov-30 12:40 06 34 28.47 +27 34 18.3 44.545492 14.254791 n.a. n.a. 0.995331156363 -0.1765917 0.01046074417660 -0.1896924 150.4956 /L 29.2080 142.2/ 0.6651 n.a. n.a. 2.0500990 356.27533 -36.19542 2024-Nov-30 12:50 06 34 28.33 +27 34 38.5 42.824710 15.730885 n.a. n.a. 0.995330448215 -0.1765332 0.01046000359957 -0.1795368 150.5027 /L 29.2009 142.3/ 0.6504 n.a. n.a. 2.0180977 353.24673 -35.13128 2024-Nov-30 13:00 06 34 28.11 +27 34 58.4 41.048363 17.159175 n.a. n.a. 0.995329740301 -0.1764748 0.01045930475557 -0.1688841 150.5101 /L 29.1936 142.4/ 0.6358 n.a. n.a. 1.9891568 350.23394 -33.88367 2024-Nov-30 13:10 06 34 27.81 +27 35 17.7 39.214939 18.536705 n.a. n.a. 0.995329032621 -0.1764163 0.01045864959828 -0.1577544 150.5178 /L 29.1860 142.6/ 0.6215 n.a. n.a. 1.9629707 347.24855 -32.44476 2024-Nov-30 13:20 06 34 27.45 +27 35 36.6 37.323171 19.860400 n.a. n.a. 0.995328325176 -0.1763579 0.01045803999804 -0.1461691 150.5258 /L 29.1781 142.7/ 0.6073 n.a. n.a. 1.9391981 344.30128 -30.80726 2024-Nov-30 13:30 06 34 27.02 +27 35 55.0 35.372085 21.127073 n.a. n.a. 0.995327617965 -0.1762995 0.01045747773814 -0.1341503 150.5340 /L 29.1699 142.8/ 0.5934 n.a. n.a. 1.9174685 341.40175 -28.96449 2024-Nov-30 13:40 06 34 26.52 +27 36 12.9 33.361059 22.333442 n.a. n.a. 0.995326910988 -0.1762410 0.01045696451142 -0.1217210 150.5425 /L 29.1615 142.9/ 0.5796 n.a. n.a. 1.8973896 338.55826 -26.91066 2024-Nov-30 13:50 06 34 25.97 +27 36 30.3 31.289890 23.476154 n.a. n.a. 0.995326204246 -0.1761826 0.01045650191684 -0.1089049 150.5512 /L 29.1529 143.0/ 0.5661 n.a. n.a. 1.8785553 335.77773 -24.64104 2024-Nov-30 14:00 06 34 25.36 +27 36 47.1 29.158851 24.551803 n.a. n.a. 0.995325497738 -0.1761242 0.01045609145644 -0.0957267 150.5602 /L 29.1441 143.2/ 0.5528 n.a. n.a. 1.8605520 333.06556 -22.15234 2024-Nov-30 14:10 06 34 24.69 +27 37 03.4 26.968759 25.556964 n.a. n.a. 0.995324791464 -0.1760658 0.01045573453237 -0.0822115 150.5693 /L 29.1350 143.3/ 0.5398 n.a. n.a. 1.8429661 330.42574 -19.44309 2024-Nov-30 14:20 06 34 23.98 +27 37 19.1 24.721033 26.488231 n.a. n.a. 0.995324085425 -0.1760074 0.01045543244410 -0.0683853 150.5786 /L 29.1258 143.4/ 0.5269 n.a. n.a. 1.8253893 327.86081 -16.51412 2024-Nov-30 14:30 06 34 23.23 +27 37 34.3 22.417744 27.342250 n.a. n.a. 0.995323379620 -0.1759490 0.01045518638593 -0.0542747 150.5881 /L 29.1164 143.5/ 0.5144 n.a. n.a. 1.8074242 325.37202 -13.36911 2024-Nov-30 14:40 06 34 22.43 +27 37 48.8 20.061657 28.115771 n.a. n.a. 0.995322674050 -0.1758906 0.01045499744460 -0.0399067 150.5977 /L 29.1069 143.6/ 0.5020 n.a. n.a. 1.7886884 322.95941 -10.01512 2024-Nov-30 14:50 06 34 21.60 +27 38 02.8 17.656259 28.805696 n.a. n.a. 0.995321968713 -0.1758322 0.01045486659714 -0.0253088 150.6075 /L 29.0972 143.8/ 0.4900 n.a. n.a. 1.7688180 320.62193 -6.463118 2024-Nov-30 15:00 06 34 20.74 +27 38 16.1 15.205767 29.409128 n.a. n.a. 0.995321263611 -0.1757738 0.01045479470904 -0.0105093 150.6175 /L 29.0873 143.9/ 0.4781 n.a. n.a. 1.7474704 318.35759 -2.728347 2024-Nov-30 15:10 06 34 19.85 +27 38 28.8 12.715115 29.923423 n.a. n.a. 0.995320558743 -0.1757154 0.01045478253241 0.0044635 150.6275 /L 29.0774 144.0/ 0.4666 n.a. n.a. 1.7243258 316.16355 1.1694939 2024-Nov-30 15:20 06 34 18.94 +27 38 40.9 10.189913 30.346247 n.a. n.a. 0.995319854109 -0.1756570 0.01045483070463 0.0195808 150.6376 /L 29.0674 144.1/ 0.4553 n.a. n.a. 1.6990890 314.03622 5.2063947 2024-Nov-30 15:30 06 34 18.01 +27 38 52.4 7.636385 30.675618 n.a. n.a. 0.995319149710 -0.1755986 0.01045493974699 0.0348136 150.6478 /L 29.0572 144.2/ 0.4443 n.a. n.a. 1.6714901 311.97137 9.3545406 2024-Nov-30 15:40 06 34 17.06 +27 39 03.2 5.061283 30.909956 n.a. n.a. 0.995318445544 -0.1755403 0.01045511006377 0.0501325 150.6581 /L 29.0471 144.4/ 0.4336 n.a. n.a. 1.6412848 309.96414 13.583190 2024-Nov-30 15:50 06 34 16.11 +27 39 13.4 2.471772 31.048114 n.a. n.a. 0.995317741613 -0.1754819 0.01045534194137 0.0655080 150.6684 /L 29.0368 144.5/ 0.4231 n.a. n.a. 1.6082546 308.00910 17.859878 2024-Nov-30 16:00 t 06 34 15.15 +27 39 22.9 359.875299 31.089409 n.a. n.a. 0.995317037916 -0.1754235 0.01045563554775 0.0809107 150.6788 /L 29.0266 144.6/ 0.4129 n.a. n.a. 1.5722066 306.10020 22.151828 2024-Nov-30 16:10 06 34 14.20 +27 39 31.8 357.279454 31.033636 n.a. n.a. 0.995316334453 -0.1753652 0.01045599093214 0.0963108 150.6891 /L 29.0163 144.7/ 0.4030 n.a. n.a. 1.5329732 304.23076 26.427408 2024-Nov-30 16:20 06 34 13.24 +27 39 40.1 354.691813 30.881076 n.a. n.a. 0.995315631224 -0.1753068 0.01045640802497 0.1116787 150.6995 /L 29.0060 144.8/ 0.3934 n.a. n.a. 1.4904119 302.39334 30.657462 2024-Nov-30 16:30 06 34 12.30 +27 39 47.7 352.119790 30.632486 n.a. n.a. 0.995314928229 -0.1752485 0.01045688663793 0.1269849 150.7098 /L 28.9958 144.9/ 0.3840 n.a. n.a. 1.4444050 300.57960 34.816367 2024-Nov-30 16:40 06 34 11.37 +27 39 54.7 349.570495 30.289081 n.a. n.a. 0.995314225468 -0.1751901 0.01045742646441 0.1422000 150.7201 /L 28.9856 145.1/ 0.3750 n.a. n.a. 1.3948592 298.78003 38.882723 2024-Nov-30 16:50 06 34 10.46 +27 40 01.1 347.050606 29.852509 n.a. n.a. 0.995313522941 -0.1751318 0.01045802708010 0.1572947 150.7303 /L 28.9754 145.2/ 0.3662 n.a. n.a. 1.3417055 296.98362 42.839659 2024-Nov-30 17:00 06 34 09.57 +27 40 06.9 344.566262 29.324809 n.a. n.a. 0.995312820648 -0.1750734 0.01045868794382 0.1722399 150.7405 /L 28.9653 145.3/ 0.3577 n.a. n.a. 1.2848998 295.17734 46.674767 2024-Nov-30 17:10 06 34 08.71 +27 40 12.0 342.122973 28.708368 n.a. n.a. 0.995312118590 -0.1750151 0.01045940839862 0.1870070 150.7506 /L 28.9553 145.4/ 0.3494 n.a. n.a. 1.2244231 293.34542 50.379758 2024-Nov-30 17:20 A 06 34 07.88 +27 40 16.5 339.725567 28.005872 n.a. n.a. 0.995311416765 -0.1749568 0.01046018767303 0.2015676 150.7605 /L 28.9454 145.5/ 0.3415 n.a. n.a. 1.1602834 291.46825 53.949907 2024-Nov-30 17:30 A 06 34 07.08 +27 40 20.4 337.378151 27.220254 n.a. n.a. 0.995310715174 -0.1748984 0.01046102488265 0.2158937 150.7704 /L 28.9356 145.6/ 0.3338 n.a. n.a. 1.0925179 289.52081 57.383382 2024-Nov-30 17:40 A 06 34 06.33 +27 40 23.7 335.084104 26.354640 n.a. n.a. 0.995310013817 -0.1748401 0.01046191903186 0.2299578 150.7801 /L 28.9260 145.7/ 0.3264 n.a. n.a. 1.0211976 287.47019 60.680515 2024-Nov-30 17:50 A 06 34 05.61 +27 40 26.5 332.846085 25.412302 n.a. n.a. 0.995309312694 -0.1747818 0.01046286901581 0.2437331 150.7897 /L 28.9165 145.8/ 0.3192 n.a. n.a. 0.9464350 285.27175 63.843036 2024-Nov-30 18:00 N 06 34 04.95 +27 40 28.7 330.666065 24.396602 n.a. n.a. 0.995308611805 -0.1747235 0.01046387362256 0.2571930 150.7991 /L 28.9072 145.9/ 0.3123 n.a. n.a. 0.8683964 282.86287 66.873273 2024-Nov-30 18:10 N 06 34 04.34 +27 40 30.3 328.545370 23.310956 n.a. n.a. 0.995307911150 -0.1746652 0.01046493153553 0.2703118 150.8083 /L 28.8980 146.0/ 0.3057 n.a. n.a. 0.7873253 280.15237 69.773232 2024-Nov-30 18:20 Nm 06 34 03.79 +27 40 31.4 326.484734 22.158786 n.a. n.a. 0.995307210729 -0.1746069 0.01046604133603 0.2830643 150.8173 /L 28.8890 146.1/ 0.2994 n.a. n.a. 0.7035833 277.00189 72.543394 2024-Nov-30 18:30 Cm 06 34 03.29 +27 40 32.0 324.484357 20.943495 n.a. n.a. 0.995306510541 -0.1745486 0.01046720150613 0.2954262 150.8261 /L 28.8803 146.2/ 0.2933 n.a. n.a. 0.6177301 273.19146 75.180828 2024-Nov-30 18:40 Cm 06 34 02.86 +27 40 32.1 322.543972 19.668426 n.a. n.a. 0.995305810588 -0.1744903 0.01046841043156 0.3073739 150.8347 /L 28.8718 146.3/ 0.2874 n.a. n.a. 0.5306869 268.35279 77.675735 >..... 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/hrzn_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ***************************************************************************************************************************************************************************************************************************************************