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 Mon Dec 9 18:23:24 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Euclid (spacecraft) (-680) {source: Euclid_current} Center body name: Earth (399) {source: DE441} Center-site name: Swan Reach Imaging, Glenalta ******************************************************************************* 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 : 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.241209.p250307 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-DEC-09. PREDICTS-> 2025-MAR-06 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 12:00 06 34 30.19 +27 32 35.0 56.224768 -0.425149 n.a. n.a. 0.995333991306 -0.1768255 0.01047027655189 -0.2378174 150.4630 /L 29.2399 141.6/ 0.7409 n.a. n.a. 2.3903421 20.335662 -38.17003 2024-Nov-30 12:10 06 34 30.76 +27 32 57.4 54.791134 1.271114 n.a. n.a. 0.995333282220 -0.1767670 0.01046933358104 -0.2323265 150.4675 /L 29.2356 141.7/ 0.7258 n.a. n.a. 2.3290763 17.675750 -38.24523 2024-Nov-30 12:20 06 34 31.24 +27 33 19.5 53.321535 2.937443 n.a. n.a. 0.995332573368 -0.1767086 0.01046841383271 -0.2262385 150.4723 /L 29.2308 141.9/ 0.7108 n.a. n.a. 2.2712631 14.948564 -38.20832 2024-Nov-30 12:30 06 34 31.64 +27 33 41.3 51.814042 4.571948 n.a. n.a. 0.995331864750 -0.1766501 0.01046751967879 -0.2195649 150.4774 /L 29.2258 142.0/ 0.6959 n.a. n.a. 2.2169853 12.160819 -38.05073 2024-Nov-30 12:40 06 34 31.94 +27 34 02.8 50.266756 6.172636 n.a. n.a. 0.995331156367 -0.1765917 0.01046665344288 -0.2123184 150.4828 /L 29.2204 142.1/ 0.6812 n.a. n.a. 2.1662831 9.3204648 -37.76363 2024-Nov-30 12:50 06 34 32.16 +27 34 24.0 48.677819 7.737403 n.a. n.a. 0.995330448218 -0.1765332 0.01046581739585 -0.2045126 150.4886 /L 29.2147 142.2/ 0.6665 n.a. n.a. 2.1191520 6.4365869 -37.33798 2024-Nov-30 13:00 06 34 32.29 +27 34 44.9 47.045437 9.264036 n.a. n.a. 0.995329740304 -0.1764748 0.01046501375135 -0.1961624 150.4947 /L 29.2087 142.3/ 0.6520 n.a. n.a. 2.0755400 3.5192484 -36.76464 2024-Nov-30 13:10 06 34 32.34 +27 35 05.5 45.367897 10.750210 n.a. n.a. 0.995329032624 -0.1764163 0.01046424466159 -0.1872835 150.5011 /L 29.2024 142.4/ 0.6376 n.a. n.a. 2.0353470 0.5792744 -36.03440 2024-Nov-30 13:20 06 34 32.31 +27 35 25.6 43.643596 12.193493 n.a. n.a. 0.995328325179 -0.1763579 0.01046351221315 -0.1778928 150.5078 /L 29.1957 142.5/ 0.6234 n.a. n.a. 1.9984251 357.62799 -35.13807 2024-Nov-30 13:30 06 34 32.21 +27 35 45.4 41.871066 13.591341 n.a. n.a. 0.995327617968 -0.1762995 0.01046281842289 -0.1680083 150.5148 /L 29.1888 142.7/ 0.6094 n.a. n.a. 1.9645798 354.67693 -34.06654 2024-Nov-30 13:40 06 34 32.03 +27 36 04.7 40.049012 14.941109 n.a. n.a. 0.995326910991 -0.1762410 0.01046216523406 -0.1576488 150.5221 /L 29.1816 142.8/ 0.5955 n.a. n.a. 1.9335736 351.73752 -32.81087 2024-Nov-30 13:50 06 34 31.78 +27 36 23.6 38.176345 16.240054 n.a. n.a. 0.995326204249 -0.1761826 0.01046155451247 -0.1468339 150.5296 /L 29.1742 142.9/ 0.5819 n.a. n.a. 1.9051299 348.82077 -31.36242 2024-Nov-30 14:00 06 34 31.47 +27 36 42.1 36.252224 17.485347 n.a. n.a. 0.995325497741 -0.1761242 0.01046098804290 -0.1355845 150.5374 /L 29.1665 143.0/ 0.5684 n.a. n.a. 1.8789382 345.93702 -29.71292 2024-Nov-30 14:10 06 34 31.09 +27 37 00.1 34.276100 18.674083 n.a. n.a. 0.995324791467 -0.1760658 0.01046046752558 -0.1239220 150.5455 /L 29.1585 143.1/ 0.5551 n.a. n.a. 1.8546603 343.09567 -27.85469 2024-Nov-30 14:20 06 34 30.65 +27 37 17.5 32.247759 19.803302 n.a. n.a. 0.995324085428 -0.1760074 0.01045999457290 -0.1118686 150.5537 /L 29.1503 143.2/ 0.5420 n.a. n.a. 1.8319368 340.30499 -25.78081 2024-Nov-30 14:30 06 34 30.15 +27 37 34.5 30.167371 20.870003 n.a. n.a. 0.995323379623 -0.1759490 0.01045957070620 -0.0994475 150.5622 /L 29.1419 143.4/ 0.5292 n.a. n.a. 1.8103934 337.57203 -23.48548 2024-Nov-30 14:40 06 34 29.61 +27 37 51.0 28.035537 21.871169 n.a. n.a. 0.995322674052 -0.1758906 0.01045919735286 -0.0866824 150.5709 /L 29.1333 143.5/ 0.5165 n.a. n.a. 1.7896479 334.90248 -20.96433 2024-Nov-30 14:50 06 34 29.01 +27 38 06.9 25.853326 22.803799 n.a. n.a. 0.995321968715 -0.1758322 0.01045887584346 -0.0735979 150.5798 /L 29.1245 143.6/ 0.5041 n.a. n.a. 1.7693159 332.30073 -18.21496 2024-Nov-30 15:00 06 34 28.36 +27 38 22.3 23.622319 23.664932 n.a. n.a. 0.995321263613 -0.1757738 0.01045860740917 -0.0602190 150.5889 /L 29.1155 143.7/ 0.4919 n.a. n.a. 1.7490164 329.76984 -15.23747 2024-Nov-30 15:10 06 34 27.68 +27 38 37.1 21.344638 24.451690 n.a. n.a. 0.995320558745 -0.1757154 0.01045839317934 -0.0465713 150.5982 /L 29.1064 143.8/ 0.4800 n.a. n.a. 1.7283771 327.31162 -12.03509 2024-Nov-30 15:20 06 34 26.95 +27 38 51.3 19.022970 25.161308 n.a. n.a. 0.995319854111 -0.1756570 0.01045823417933 -0.0326812 150.6075 /L 29.0971 144.0/ 0.4683 n.a. n.a. 1.7070381 324.92673 -8.614870 2024-Nov-30 15:30 06 34 26.20 +27 39 04.9 16.660571 25.791176 n.a. n.a. 0.995319149711 -0.1755986 0.01045813132840 -0.0185752 150.6171 /L 29.0876 144.1/ 0.4569 n.a. n.a. 1.6846556 322.61479 -4.988261 2024-Nov-30 15:40 06 34 25.41 +27 39 18.0 14.261268 26.338884 n.a. n.a. 0.995318445546 -0.1755403 0.01045808543803 -0.0042804 150.6267 /L 29.0781 144.2/ 0.4457 n.a. n.a. 1.6609045 320.37446 -1.171573 2024-Nov-30 15:50 06 34 24.60 +27 39 30.5 11.829431 26.802255 n.a. n.a. 0.995317741614 -0.1754819 0.01045809721017 0.0101756 150.6365 /L 29.0684 144.3/ 0.4347 n.a. n.a. 1.6354803 318.20357 2.8138311 2024-Nov-30 16:00 06 34 23.76 +27 39 42.3 9.369938 27.179392 n.a. n.a. 0.995317037917 -0.1754235 0.01045816723604 0.0247651 150.6463 /L 29.0587 144.4/ 0.4240 n.a. n.a. 1.6081008 316.09919 6.9417231 2024-Nov-30 16:10 06 34 22.92 +27 39 53.6 6.888117 27.468708 n.a. n.a. 0.995316334454 -0.1753652 0.01045829599482 0.0394600 150.6562 /L 29.0489 144.5/ 0.4136 n.a. n.a. 1.5785070 314.05773 11.181631 2024-Nov-30 16:20 06 34 22.05 +27 40 04.2 4.389673 27.668960 n.a. n.a. 0.995315631225 -0.1753068 0.01045848385278 0.0542322 150.6662 /L 29.0390 144.7/ 0.4035 n.a. n.a. 1.5464635 312.07500 15.499914 2024-Nov-30 16:30 06 34 21.18 +27 40 14.2 1.880600 27.779276 n.a. n.a. 0.995314928230 -0.1752485 0.01045873106255 0.0690531 150.6762 /L 29.0291 144.8/ 0.3936 n.a. n.a. 1.5117586 310.14618 19.861209 2024-Nov-30 16:40 t 06 34 20.31 +27 40 23.6 359.367079 27.799170 n.a. n.a. 0.995314225469 -0.1751901 0.01045903776264 0.0838942 150.6862 /L 29.0191 144.9/ 0.3840 n.a. n.a. 1.4742049 308.26589 24.230102 2024-Nov-30 16:50 06 34 19.44 +27 40 32.4 356.855372 27.728555 n.a. n.a. 0.995313522942 -0.1751318 0.01045940397715 0.0987272 150.6962 /L 29.0091 145.0/ 0.3746 n.a. n.a. 1.4336384 306.42809 28.572804 2024-Nov-30 17:00 06 34 18.57 +27 40 40.6 354.351710 27.567745 n.a. n.a. 0.995312820649 -0.1750734 0.01045982961573 0.1135233 150.7063 /L 28.9992 145.1/ 0.3655 n.a. n.a. 1.3899185 304.62601 32.858643 2024-Nov-30 17:10 06 34 17.72 +27 40 48.2 351.862182 27.317447 n.a. n.a. 0.995312118590 -0.1750151 0.01046031447379 0.1282542 150.7163 /L 28.9893 145.2/ 0.3567 n.a. n.a. 1.3429277 302.85199 37.061191 2024-Nov-30 17:20 06 34 16.87 +27 40 55.1 349.392630 26.978746 n.a. n.a. 0.995311416765 -0.1749568 0.01046085823286 0.1428916 150.7263 /L 28.9794 145.4/ 0.3482 n.a. n.a. 1.2925713 301.09724 41.158941 2024-Nov-30 17:30 06 34 16.05 +27 41 01.5 346.948558 26.553083 n.a. n.a. 0.995310715174 -0.1748984 0.01046146046127 0.1574072 150.7362 /L 28.9695 145.5/ 0.3399 n.a. n.a. 1.2387772 299.35152 45.135522 2024-Nov-30 17:40 A 06 34 15.25 +27 41 07.2 344.535050 26.042226 n.a. n.a. 0.995310013817 -0.1748401 0.01046212061498 0.1717733 150.7460 /L 28.9598 145.6/ 0.3319 n.a. n.a. 1.1814957 297.60254 48.979508 2024-Nov-30 17:50 A 06 34 14.47 +27 41 12.4 342.156705 25.448236 n.a. n.a. 0.995309312694 -0.1747818 0.01046283803867 0.1859622 150.7558 /L 28.9501 145.7/ 0.3241 n.a. n.a. 1.1207005 295.83529 52.683930 2024-Nov-30 18:00 A 06 34 13.73 +27 41 16.9 339.817592 24.773426 n.a. n.a. 0.995308611805 -0.1747235 0.01046361196705 0.1999468 150.7654 /L 28.9405 145.8/ 0.3167 n.a. n.a. 1.0563889 294.03081 56.245593 2024-Nov-30 18:10 A 06 34 13.02 +27 41 20.9 337.521218 24.020326 n.a. n.a. 0.995307911150 -0.1746652 0.01046444152632 0.2137000 150.7749 /L 28.9311 145.9/ 0.3094 n.a. n.a. 0.9885843 292.16447 59.664299 2024-Nov-30 18:20 N 06 34 12.35 +27 41 24.3 335.270522 23.191638 n.a. n.a. 0.995307210728 -0.1746069 0.01046532573595 0.2271956 150.7843 /L 28.9217 146.0/ 0.3025 n.a. n.a. 0.9173395 290.20315 62.942037 2024-Nov-30 18:30 N 06 34 11.72 +27 41 27.2 333.067872 22.290197 n.a. n.a. 0.995306510541 -0.1745486 0.01046626351060 0.2404077 150.7936 /L 28.9125 146.1/ 0.2958 n.a. n.a. 0.8427432 288.10065 66.082185 2024-Nov-30 18:40 N 06 34 11.14 +27 41 29.5 330.915084 21.318932 n.a. n.a. 0.995305810587 -0.1744903 0.01046725366225 0.2533110 150.8027 /L 28.9035 146.2/ 0.2894 n.a. n.a. 0.7649312 285.78990 69.088682 2024-Nov-30 18:50 Nm 06 34 10.61 +27 41 31.3 328.813452 20.280832 n.a. n.a. 0.995305110867 -0.1744320 0.01046829490254 0.2658807 150.8116 /L 28.8947 146.3/ 0.2832 n.a. n.a. 0.6841079 283.16898 71.965103 2024-Nov-30 19:00 Cm 06 34 10.14 +27 41 32.6 326.763777 19.178912 n.a. n.a. 0.995304411381 -0.1743737 0.01046938584533 0.2780928 150.8203 /L 28.8860 146.4/ 0.2772 n.a. n.a. 0.6005881 280.07458 74.713399 2024-Nov-30 19:10 Cm 06 34 09.72 +27 41 33.4 324.766415 18.016180 n.a. n.a. 0.995303712129 -0.1743155 0.01047052500936 0.2899240 150.8288 /L 28.8776 146.5/ 0.2715 n.a. n.a. 0.5148850 276.22809 77.331767 2024-Nov-30 19:20 Cm 06 34 09.37 +27 41 33.7 322.821321 16.795620 n.a. n.a. 0.995303013110 -0.1742572 0.01047171082125 0.3013516 150.8371 /L 28.8693 146.6/ 0.2661 n.a. n.a. 0.4279120 271.11712 79.810232 >..... 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 ***************************************************************************************************************************************************************************************************************************************************