API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 19521 Chaos (1998 WH24) 2024-Apr-30 11:47:55 Rec #: 19521 (+COV) Soln.date: 2024-Feb-21_06:33:20 # obs: 164 (1991-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459415.5 ! 2021-Jul-20.00 (TDB) Residual RMS= .098377 EC= .1001094023440874 QR= 41.02350262442897 TP= 2464043.378856915 OM= 49.95093099412455 W= 56.43967256694445 IN= 12.03144974432631 A= 45.58721108020173 MA= 345.1809105311032 ADIST= 50.15091953597448 PER= 307.80292 N= .003202134 ANGMOM= .115562186 DAN= 42.76371 DDN= 47.77426 L= 105.8018544 B= 10.0030773 MOID= 40.05649948 TP= 2034-Mar-21.8788569150 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 4.63 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#17, OCC=2 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Tue Apr 30 11:47:55 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 19521 Chaos (1998 WH24) {source: JPL#17} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2033-Dec-20 00:00:00.0000 UT Stop time : A.D. 2033-Dec-31 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {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 : Sun 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 Small-body perts: Yes {source: SB441-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240429.p240723 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-29. PREDICTS-> 2024-JUL-22 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO ) Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2459415.5 ! 2021-Jul-20.00 (TDB) Residual RMS= .098377 EC= .1001094023440874 QR= 41.02350262442897 TP= 2464043.378856915 OM= 49.95093099412455 W= 56.43967256694445 IN= 12.03144974432631 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.696392627160721E+00 Y= 3.534339233988717E+01 Z= 2.112445716467229E+01 VX=-2.769167132530604E-03 VY=-2.004383329551016E-04 VZ= 4.019323142959552E-04 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 4.63 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2033-Dec-20 00:00 41.00230413090 -0.0001325 2033-Dec-20 03:00 41.00230412151 -0.0001274 2033-Dec-20 06:00 41.00230411250 -0.0001223 2033-Dec-20 09:00 41.00230410385 -0.0001172 2033-Dec-20 12:00 41.00230409557 -0.0001121 2033-Dec-20 15:00 41.00230408766 -0.0001070 2033-Dec-20 18:00 41.00230408012 -0.0001019 2033-Dec-20 21:00 41.00230407295 -0.0000968 2033-Dec-21 00:00 41.00230406614 -0.0000917 2033-Dec-21 03:00 41.00230405970 -0.0000866 2033-Dec-21 06:00 41.00230405363 -0.0000815 2033-Dec-21 09:00 41.00230404792 -0.0000765 2033-Dec-21 12:00 41.00230404259 -0.0000714 2033-Dec-21 15:00 41.00230403762 -0.0000663 2033-Dec-21 18:00 41.00230403302 -0.0000612 2033-Dec-21 21:00 41.00230402879 -0.0000561 2033-Dec-22 00:00 41.00230402493 -0.0000510 2033-Dec-22 03:00 41.00230402143 -0.0000459 2033-Dec-22 06:00 41.00230401830 -0.0000408 2033-Dec-22 09:00 41.00230401554 -0.0000357 2033-Dec-22 12:00 41.00230401315 -0.0000306 2033-Dec-22 15:00 41.00230401112 -0.0000255 2033-Dec-22 18:00 41.00230400947 -0.0000204 2033-Dec-22 21:00 41.00230400818 -0.0000153 2033-Dec-23 00:00 41.00230400726 -0.0000102 2033-Dec-23 03:00 41.00230400671 -0.0000051 2033-Dec-23 06:00 41.00230400652 0.0000000 2033-Dec-23 09:00 41.00230400671 0.0000051 2033-Dec-23 12:00 41.00230400726 0.0000102 2033-Dec-23 15:00 41.00230400818 0.0000153 2033-Dec-23 18:00 41.00230400946 0.0000204 2033-Dec-23 21:00 41.00230401112 0.0000255 2033-Dec-24 00:00 41.00230401314 0.0000306 2033-Dec-24 03:00 41.00230401553 0.0000357 2033-Dec-24 06:00 41.00230401829 0.0000408 2033-Dec-24 09:00 41.00230402142 0.0000459 2033-Dec-24 12:00 41.00230402491 0.0000510 2033-Dec-24 15:00 41.00230402878 0.0000561 2033-Dec-24 18:00 41.00230403301 0.0000612 2033-Dec-24 21:00 41.00230403761 0.0000662 2033-Dec-25 00:00 41.00230404257 0.0000713 2033-Dec-25 03:00 41.00230404791 0.0000764 2033-Dec-25 06:00 41.00230405361 0.0000815 2033-Dec-25 09:00 41.00230405968 0.0000866 2033-Dec-25 12:00 41.00230406612 0.0000917 2033-Dec-25 15:00 41.00230407293 0.0000968 2033-Dec-25 18:00 41.00230408010 0.0001019 2033-Dec-25 21:00 41.00230408764 0.0001070 2033-Dec-26 00:00 41.00230409555 0.0001121 2033-Dec-26 03:00 41.00230410383 0.0001172 2033-Dec-26 06:00 41.00230411248 0.0001223 2033-Dec-26 09:00 41.00230412149 0.0001274 2033-Dec-26 12:00 41.00230413087 0.0001325 2033-Dec-26 15:00 41.00230414062 0.0001376 2033-Dec-26 18:00 41.00230415074 0.0001427 2033-Dec-26 21:00 41.00230416123 0.0001478 2033-Dec-27 00:00 41.00230417208 0.0001529 2033-Dec-27 03:00 41.00230418330 0.0001580 2033-Dec-27 06:00 41.00230419489 0.0001631 2033-Dec-27 09:00 41.00230420685 0.0001682 2033-Dec-27 12:00 41.00230421917 0.0001733 2033-Dec-27 15:00 41.00230423187 0.0001784 2033-Dec-27 18:00 41.00230424493 0.0001835 2033-Dec-27 21:00 41.00230425836 0.0001886 2033-Dec-28 00:00 41.00230427215 0.0001937 2033-Dec-28 03:00 41.00230428632 0.0001987 2033-Dec-28 06:00 41.00230430085 0.0002038 2033-Dec-28 09:00 41.00230431575 0.0002089 2033-Dec-28 12:00 41.00230433102 0.0002140 2033-Dec-28 15:00 41.00230434665 0.0002191 2033-Dec-28 18:00 41.00230436266 0.0002242 2033-Dec-28 21:00 41.00230437903 0.0002293 2033-Dec-29 00:00 41.00230439577 0.0002344 2033-Dec-29 03:00 41.00230441287 0.0002395 2033-Dec-29 06:00 41.00230443035 0.0002446 2033-Dec-29 09:00 41.00230444819 0.0002497 2033-Dec-29 12:00 41.00230446640 0.0002548 2033-Dec-29 15:00 41.00230448498 0.0002599 2033-Dec-29 18:00 41.00230450392 0.0002650 2033-Dec-29 21:00 41.00230452324 0.0002701 2033-Dec-30 00:00 41.00230454292 0.0002752 2033-Dec-30 03:00 41.00230456297 0.0002803 2033-Dec-30 06:00 41.00230458339 0.0002853 2033-Dec-30 09:00 41.00230460417 0.0002904 2033-Dec-30 12:00 41.00230462532 0.0002955 2033-Dec-30 15:00 41.00230464684 0.0003006 2033-Dec-30 18:00 41.00230466873 0.0003057 2033-Dec-30 21:00 41.00230469098 0.0003108 2033-Dec-31 00:00 41.00230471361 0.0003159 $$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. '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 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 *******************************************************************************