API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 138971 (2001 CB21) 2024-Apr-18 01:33:20 Rec #: 138971 (+COV) Soln.date: 2024-Feb-10_06:15:07 # obs: 2056 (2001-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2458145.5 ! 2018-Jan-27.00 (TDB) Residual RMS= .286 EC= .3335536860179197 QR= .6895187517631686 TP= 2458172.141887357 OM= 353.7642870531959 W= 271.7396866494355 IN= 7.901734377044636 A= 1.03462009961947 MA= 335.048440492301 ADIST= 1.379721447475772 PER= 1.0524 N= .93655375 ANGMOM= .016495282 DAN= .91029 DDN= .92892 L= 265.5206394 B= -7.898069 MOID= .0238138 TP= 2018-Feb-22.6418873570 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 3.303 H= 18.52 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#301, PHA OCC=0 radar( 1 delay, 1 Dop.) 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu Apr 18 01:33:20 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 138971 (2001 CB21) {source: JPL#301} Center body name: DART (spacecraft) (-135) {source: DART_V03_HRZN} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2022-Mar-01 00:00:00.0000 UT Stop time : A.D. 2022-Mar-03 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, 0.0 {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 : ICRF Center radii : undefined Target primary : Sun Vis. interferer : None Rel. light bend : Sun {source: DART_V03_HRZN} 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.240416.p240711 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-16. PREDICTS-> 2024-JUL-10 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 n.a. , 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= 2458145.5 ! 2018-Jan-27.00 (TDB) Residual RMS= .286 EC= .3335536860179197 QR= .6895187517631686 TP= 2458172.141887357 OM= 353.7642870531959 W= 271.7396866494355 IN= 7.901734377044636 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-6.128397485822392E-01 Y=-3.739107849659524E-01 Z=-2.380058491318498E-01 VX= 1.647468128490555E-02 VY=-1.294575822669210E-02 VZ=-7.581629224203507E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 3.303 H= 18.52 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ********************************************************************************************************** Date__(UT)__HR:MN R.A._____(ICRF)_____DEC APmag S-brt delta deldot S-O-T /r ********************************************************************************************************** $$SOE 2022-Mar-01 00:00 07 00 06.82 +07 12 03.9 15.950 n.a. 1.7487287962E+07 -0.6421470 115.9850 /L 2022-Mar-01 01:00 06 59 42.49 +07 09 55.9 15.953 n.a. 1.7485004915E+07 -0.6261025 115.8381 /L 2022-Mar-01 02:00 06 59 18.16 +07 07 47.9 15.956 n.a. 1.7482779592E+07 -0.6100807 115.6912 /L 2022-Mar-01 03:00 06 58 53.84 +07 05 39.7 15.960 n.a. 1.7480611912E+07 -0.5940818 115.5443 /L 2022-Mar-01 04:00 06 58 29.54 +07 03 31.5 15.963 n.a. 1.7478501792E+07 -0.5781058 115.3974 /L 2022-Mar-01 05:00 06 58 05.23 +07 01 23.2 15.966 n.a. 1.7476449149E+07 -0.5621528 115.2506 /L 2022-Mar-01 06:00 06 57 40.94 +06 59 14.7 15.969 n.a. 1.7474453900E+07 -0.5462229 115.1038 /L 2022-Mar-01 07:00 06 57 16.65 +06 57 06.2 15.973 n.a. 1.7472515963E+07 -0.5303161 114.9570 /L 2022-Mar-01 08:00 06 56 52.38 +06 54 57.6 15.976 n.a. 1.7470635253E+07 -0.5144326 114.8103 /L 2022-Mar-01 09:00 06 56 28.11 +06 52 48.9 15.979 n.a. 1.7468811687E+07 -0.4985723 114.6635 /L 2022-Mar-01 10:00 06 56 03.85 +06 50 40.1 15.983 n.a. 1.7467045180E+07 -0.4827355 114.5168 /L 2022-Mar-01 11:00 06 55 39.59 +06 48 31.2 15.986 n.a. 1.7465335650E+07 -0.4669220 114.3702 /L 2022-Mar-01 12:00 06 55 15.35 +06 46 22.3 15.989 n.a. 1.7463683011E+07 -0.4511321 114.2235 /L 2022-Mar-01 13:00 06 54 51.11 +06 44 13.2 15.993 n.a. 1.7462087178E+07 -0.4353657 114.0769 /L 2022-Mar-01 14:00 06 54 26.88 +06 42 04.1 15.996 n.a. 1.7460548066E+07 -0.4196230 113.9304 /L 2022-Mar-01 15:00 06 54 02.66 +06 39 54.9 16.000 n.a. 1.7459065591E+07 -0.4039040 113.7838 /L 2022-Mar-01 16:00 06 53 38.45 +06 37 45.6 16.003 n.a. 1.7457639666E+07 -0.3882088 113.6373 /L 2022-Mar-01 17:00 06 53 14.25 +06 35 36.2 16.006 n.a. 1.7456270207E+07 -0.3725374 113.4908 /L 2022-Mar-01 18:00 06 52 50.06 +06 33 26.7 16.010 n.a. 1.7454957126E+07 -0.3568900 113.3444 /L 2022-Mar-01 19:00 06 52 25.87 +06 31 17.2 16.013 n.a. 1.7453700337E+07 -0.3412665 113.1980 /L 2022-Mar-01 20:00 06 52 01.70 +06 29 07.6 16.017 n.a. 1.7452499755E+07 -0.3256671 113.0516 /L 2022-Mar-01 21:00 06 51 37.53 +06 26 57.9 16.020 n.a. 1.7451355293E+07 -0.3100918 112.9053 /L 2022-Mar-01 22:00 06 51 13.38 +06 24 48.1 16.024 n.a. 1.7450266863E+07 -0.2945406 112.7590 /L 2022-Mar-01 23:00 06 50 49.23 +06 22 38.3 16.027 n.a. 1.7449234379E+07 -0.2790137 112.6127 /L 2022-Mar-02 00:00 06 50 25.10 +06 20 28.4 16.031 n.a. 1.7448257754E+07 -0.2635111 112.4665 /L 2022-Mar-02 01:00 06 50 00.97 +06 18 18.4 16.034 n.a. 1.7447336898E+07 -0.2480328 112.3203 /L 2022-Mar-02 02:00 06 49 36.85 +06 16 08.4 16.038 n.a. 1.7446471726E+07 -0.2325789 112.1741 /L 2022-Mar-02 03:00 06 49 12.75 +06 13 58.2 16.041 n.a. 1.7445662149E+07 -0.2171495 112.0280 /L 2022-Mar-02 04:00 06 48 48.65 +06 11 48.1 16.045 n.a. 1.7444908078E+07 -0.2017447 111.8819 /L 2022-Mar-02 05:00 06 48 24.56 +06 09 37.8 16.048 n.a. 1.7444209426E+07 -0.1863644 111.7359 /L 2022-Mar-02 06:00 06 48 00.49 +06 07 27.5 16.052 n.a. 1.7443566103E+07 -0.1710088 111.5899 /L 2022-Mar-02 07:00 06 47 36.42 +06 05 17.1 16.055 n.a. 1.7442978021E+07 -0.1556778 111.4439 /L 2022-Mar-02 08:00 06 47 12.37 +06 03 06.7 16.059 n.a. 1.7442445091E+07 -0.1403716 111.2980 /L 2022-Mar-02 09:00 06 46 48.32 +06 00 56.2 16.062 n.a. 1.7441967224E+07 -0.1250903 111.1521 /L 2022-Mar-02 10:00 06 46 24.29 +05 58 45.6 16.066 n.a. 1.7441544329E+07 -0.1098338 111.0063 /L 2022-Mar-02 11:00 06 46 00.26 +05 56 35.0 16.069 n.a. 1.7441176318E+07 -0.0946022 110.8605 /L 2022-Mar-02 12:00 06 45 36.25 +05 54 24.3 16.073 n.a. 1.7440863101E+07 -0.0793956 110.7147 /L 2022-Mar-02 13:00 06 45 12.25 +05 52 13.6 16.077 n.a. 1.7440604588E+07 -0.0642139 110.5690 /L 2022-Mar-02 14:00 06 44 48.26 +05 50 02.8 16.080 n.a. 1.7440400689E+07 -0.0490574 110.4234 /L 2022-Mar-02 15:00 06 44 24.28 +05 47 52.0 16.084 n.a. 1.7440251313E+07 -0.0339259 110.2777 /L 2022-Mar-02 16:00 06 44 00.31 +05 45 41.1 16.088 n.a. 1.7440156370E+07 -0.0188196 110.1322 /L 2022-Mar-02 17:00 06 43 36.36 +05 43 30.1 16.091 n.a. 1.7440115769E+07 -0.0037387 109.9866 /L 2022-Mar-02 18:00 06 43 12.41 +05 41 19.1 16.095 n.a. 1.7440129419E+07 0.0113171 109.8412 /L 2022-Mar-02 19:00 06 42 48.48 +05 39 08.1 16.099 n.a. 1.7440197229E+07 0.0263475 109.6957 /L 2022-Mar-02 20:00 06 42 24.55 +05 36 57.0 16.102 n.a. 1.7440319108E+07 0.0413526 109.5504 /L 2022-Mar-02 21:00 06 42 00.64 +05 34 45.9 16.106 n.a. 1.7440494965E+07 0.0563322 109.4050 /L 2022-Mar-02 22:00 06 41 36.74 +05 32 34.7 16.110 n.a. 1.7440724707E+07 0.0712864 109.2597 /L 2022-Mar-02 23:00 06 41 12.86 +05 30 23.5 16.113 n.a. 1.7441008243E+07 0.0862150 109.1145 /L 2022-Mar-03 00:00 06 40 48.98 +05 28 12.2 16.117 n.a. 1.7441345481E+07 0.1011181 108.9693 /L $$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.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} 'APmag S-brt' = The asteroids' approximate apparent airless visual magnitude and surface brightness using the standard IAU H-G system magnitude model: APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi_1 + G*phi_2) For solar phase angles >90 deg, the error could exceed 1 magnitude. For phase angles >120 degrees, output values are rounded to the nearest integer to indicate error could be large and unknown. 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 '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 '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 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 **********************************************************************************************************