Statistical uncertainties not available for object due to: truncated database EST list: + ******************************************************************************* Revised: Aug 11, 2021 101955 Bennu (1999 RQ36) 2101955 *SPECIAL* Soln.date: 2021-Jan-07_11:18:06 # obs: 554 (1999-2020) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2455562.5 ! 2011-Jan-01.00 (TDB) Residual RMS= .23164 EC= .2037450762416414 QR= .8968944004459729 TP= 2455439.14194087 OM= 2.060866195696420 W= 66.22306084084298 IN= 6.0349437702479403 A= 1.1263910258948120 MA= 101.7039520024729 ADIST= 1.355887651343651 PER= 1.19548 N= 0.824461327 ANGMOM= .017873901 DAN= 0.99768 DDN= 1.17626 L= 68.16622425 B= 5.521044 MOID= .0032228 TP= 2010-Aug-30.6419408992 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= .241 ROTPER= 4.2960610 H= 20.21 G= -0.031 B-V= 0.64 ALBEDO= .044 STYP= B Asteroid non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= .00000026 A1= 0. A2= 0. A3= 0. Yarkovsky acceleration: RHO= 1191.5349121 This pre-computed trajectory of asteroid (101955) Bennu, covering 1900 to 2136 is based on ground-based optical and radar astrometry as well as pseudo-range measurements from the OSIRIS-REx mission. The trajectory accounts for the gravity of the Sun, the planets, Pluto, the Moon and 343 small-body perturbers, relativistic effect, the Yarkovsky effect, and other solar radiation perturbations. Full details are provided in Farnocchia et al. (2021): https://doi.org/10.1016/j.icarus.2021.114594 It may be used to generate ephemerides relative to the SPACECRAFT-BASED Bennu solution by specifying coordinate center as "@2101955", or extended physical ephemerides of Bennu such as sub-observer/solar latitude and longitude. Trajectory name Start (TDB) Stop (TDB) ---------------------------------------------- ----------- ----------- sb-101955-118_long 1900-Jan-01 2135-Oct-01 Due to the non-standard dynamical models enabled by extensive high-precision spacecraft data, Horizons won't generate new SPK files for Bennu. However, the final reconstructed mission SPK can be downloaded for use here: https://ssd.jpl.nasa.gov/ftp/xfr/sb-101955-118_long.bsp ASTEROID comments: 1: soln ref.= JPL#118, PHA OCC=0 radar(58 delay, 7 Dop.) 2: source=ORB; See Farnocchia et al. 2021 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu Apr 25 09:55:33 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 101955 Bennu (1999 RQ36) (2101955) {source: ORX_merged_DE424} Center body name: Earth (399) {source: ORX_merged_DE424} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2018-Oct-01 00:00:00.0000 UT Stop time : A.D. 2018-Oct-30 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : {East-longitude positive} Target radii : .2831, .2712, .2497 km {Equator_a, b, pole_c} 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: ORX_merged_DE424} Rel. light bend : Sun {source: ORX_merged_DE424} 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 EOP file : eop.240424.p240718 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-24. PREDICTS-> 2024-JUL-17 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 ) ************************************************************************************************************************************************************* Date__(UT)__HR:MN:SS delta deldot 1-way_down_LT VmagSn VmagOb RNG_3sigma RNGRT_3sig DOP_S_3sig DOP_X_3sig RT_delay_3sig ************************************************************************************************************************************************************* $$SOE 2018-Oct-01 00:00:00 1.2809767688E+08 2.8269845 7.12146428 27.5190500 17.8491005 n.a. n.a. n.a. n.a. n.a. 2018-Oct-02 00:00:00 1.2833678894E+08 2.7074485 7.13475748 27.5981322 17.9591536 n.a. n.a. n.a. n.a. n.a. 2018-Oct-03 00:00:00 1.2856554667E+08 2.5872982 7.14747504 27.6777532 18.0695166 n.a. n.a. n.a. n.a. n.a. 2018-Oct-04 00:00:00 1.2878389121E+08 2.4663990 7.15961369 27.7579044 18.1801276 n.a. n.a. n.a. n.a. n.a. 2018-Oct-05 00:00:00 1.2899175204E+08 2.3446180 7.17116951 27.8385767 18.2908857 n.a. n.a. n.a. n.a. n.a. 2018-Oct-06 00:00:00 1.2918904777E+08 2.2218392 7.18213797 27.9197609 18.4016507 n.a. n.a. n.a. n.a. n.a. 2018-Oct-07 00:00:00 1.2937568830E+08 2.0979800 7.19251407 28.0014473 18.5122504 n.a. n.a. n.a. n.a. n.a. 2018-Oct-08 00:00:00 1.2955157841E+08 1.9730067 7.20229251 28.0836258 18.6224945 n.a. n.a. n.a. n.a. n.a. 2018-Oct-09 00:00:00 1.2971662243E+08 1.8469425 7.21146797 28.1662857 18.7321939 n.a. n.a. n.a. n.a. n.a. 2018-Oct-10 00:00:00 1.2987072909E+08 1.7198651 7.22003537 28.2494160 18.8411806 n.a. n.a. n.a. n.a. n.a. 2018-Oct-11 00:00:00 1.3001381573E+08 1.5918935 7.22799013 28.3330055 18.9493220 n.a. n.a. n.a. n.a. n.a. 2018-Oct-12 00:00:00 1.3014581115E+08 1.4631704 7.23532829 28.4170421 19.0565263 n.a. n.a. n.a. n.a. n.a. 2018-Oct-13 00:00:00 1.3026665682E+08 1.3338441 7.24204659 28.5015134 19.1627392 n.a. n.a. n.a. n.a. n.a. 2018-Oct-14 00:00:00 1.3037630680E+08 1.2040558 7.24814247 28.5864067 19.2679349 n.a. n.a. n.a. n.a. n.a. 2018-Oct-15 00:00:00 1.3047472679E+08 1.0739334 7.25361403 28.6717086 19.3721063 n.a. n.a. n.a. n.a. n.a. 2018-Oct-16 00:00:00 1.3056189291E+08 0.9435899 7.25845995 28.7574050 19.4752559 n.a. n.a. n.a. n.a. n.a. 2018-Oct-17 00:00:00 1.3063779048E+08 0.8131266 7.26267940 28.8434818 19.5773896 n.a. n.a. n.a. n.a. n.a. 2018-Oct-18 00:00:00 1.3070241321E+08 0.6826367 7.26627203 28.9299238 19.6785142 n.a. n.a. n.a. n.a. n.a. 2018-Oct-19 00:00:00 1.3075576268E+08 0.5522098 7.26923795 29.0167155 19.7786370 n.a. n.a. n.a. n.a. n.a. 2018-Oct-20 00:00:00 1.3079784819E+08 0.4219353 7.27157765 29.1038409 19.8777681 n.a. n.a. n.a. n.a. n.a. 2018-Oct-21 00:00:00 1.3082868680E+08 0.2919036 7.27329209 29.1912832 19.9759238 n.a. n.a. n.a. n.a. n.a. 2018-Oct-22 00:00:00 1.3084830339E+08 0.1622052 7.27438266 29.2790252 20.0731314 n.a. n.a. n.a. n.a. n.a. 2018-Oct-23 00:00:00 1.3085673056E+08 0.0329267 7.27485115 29.3670489 20.1694326 n.a. n.a. n.a. n.a. n.a. 2018-Oct-24 00:00:00 1.3085400797E+08 -0.0958554 7.27469980 29.4553357 20.2648871 n.a. n.a. n.a. n.a. n.a. 2018-Oct-25 00:00:00 1.3084018116E+08 -0.2240843 7.27393111 29.5438665 20.3595709 n.a. n.a. n.a. n.a. n.a. 2018-Oct-26 00:00:00 1.3081529939E+08 -0.3517308 7.27254783 29.6326214 20.4535730 n.a. n.a. n.a. n.a. n.a. 2018-Oct-27 00:00:00 1.3077941300E+08 -0.4788009 7.27055276 29.7215797 20.5469856 n.a. n.a. n.a. n.a. n.a. 2018-Oct-28 00:00:00 1.3073257020E+08 -0.6053375 7.26794858 29.8107204 20.6398936 n.a. n.a. n.a. n.a. n.a. 2018-Oct-29 00:00:00 1.3067481396E+08 -0.7314177 7.26473768 29.9000215 20.7323628 n.a. n.a. n.a. n.a. n.a. 2018-Oct-30 00:00:00 1.3060617943E+08 -0.8571442 7.26092201 29.9894602 20.8244298 n.a. n.a. n.a. n.a. n.a. $$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. '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: KM and KM/S '1-way_down_LT' = 1-way down-leg light-time from target center to observer. The elapsed time since light (observed at print-time) would have left or reflected off a point at the center of the target. Units: MINUTES 'VmagSn VmagOb' = Magnitude of target centers' velocity with respect to the Sun ("VmagSn") and the observer ("VmagOb") at the time light left the target center to be observed (print time minus down-leg light-time). These are absolute values of the velocity vectors (total speeds) and do NOT indicate direction of motion. Units: KM/S 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, KM/S 'DOP_S_3sig DOP_X_3sig RT_delay_3sig' = Doppler radar uncertainties at S-band (2380 MHz) and X-band (8560 MHz) frequencies, along with the round-trip (total) delay to first-order. Units: HERTZ and SECONDS 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 ************************************************************************************************************************************************************* !$$SOF COMMAND = '1999 RQ36' CENTER = '500@399' MAKE_EPHEM = 'YES' TABLE_TYPE = 'OBSERVER' START_TIME = '2018-10-1' STOP_TIME = '2018-10-30' STEP_SIZE = '1 d' CAL_FORMAT = 'CAL' TIME_DIGITS = 'SECONDS' ANG_FORMAT = 'HMS' OUT_UNITS = 'KM-S' RANGE_UNITS = 'KM' APPARENT = 'AIRLESS' SUPPRESS_RANGE_RATE = 'NO' SKIP_DAYLT = 'NO' EXTRA_PREC = 'NO' R_T_S_ONLY = 'NO' REF_SYSTEM = 'J2000' CSV_FORMAT = 'NO' OBJ_DATA = 'YES' QUANTITIES = '20,21,22,39,40'