API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 138971 (2001 CB21) 2023-Mar-28 01:04:12 Rec #: 138971 (+COV) Soln.date: 2023-Mar-19_06:30:56 # obs: 1923 (2001-2023) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457363.5 ! 2015-Dec-07.00 (TDB) Residual RMS= .31513 EC= .3334988177434229 QR= .6895509912547499 TP= 2457403.4115539771 OM= 353.767992962339 W= 271.7463480108481 IN= 7.902160517170013 A= 1.03458329799226 MA= 322.6186899874368 ADIST= 1.37961560472977 PER= 1.05234 N= .936603722 ANGMOM= .016495328 DAN= .91026 DDN= .92896 L= 265.5310723 B= -7.8984668 MOID= .0242347 TP= 2016-Jan-15.9115539771 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 3.303 H= 18.53 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#275, PHA OCC=0 radar( 1 delay, 1 Dop.) 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Tue Mar 28 01:04:12 2023 Pasadena, USA / Horizons ******************************************************************************* Target body name: 138971 (2001 CB21) {source: JPL#275} Center body name: DART (spacecraft) (-135) {source: DART_V01_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: 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.230326.p230619 EOP coverage : DATA-BASED 1962-JAN-20 TO 2023-MAR-26. PREDICTS-> 2023-JUN-18 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= 2457363.5 ! 2015-Dec-07.00 (TDB) Residual RMS= .31513 EC= .3334988177434229 QR= .6895509912547499 TP= 2457403.4115539771 OM= 353.767992962339 W= 271.7463480108481 IN= 7.902160517170013 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-7.938565411705504E-01 Y=-1.847686765625476E-01 Z=-1.261871888976256E-01 VX= 1.082331713213310E-02 VY=-1.523435947218352E-02 VZ=-9.071882246179655E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 3.303 H= 18.53 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 15.960 n.a. 1.7487287230E+07 -0.6421474 115.9850 /L 2022-Mar-01 01:00 06 59 42.49 +07 09 55.9 15.963 n.a. 1.7485004182E+07 -0.6261029 115.8381 /L 2022-Mar-01 02:00 06 59 18.16 +07 07 47.9 15.966 n.a. 1.7482778858E+07 -0.6100811 115.6912 /L 2022-Mar-01 03:00 06 58 53.85 +07 05 39.8 15.970 n.a. 1.7480611176E+07 -0.5940822 115.5443 /L 2022-Mar-01 04:00 06 58 29.54 +07 03 31.5 15.973 n.a. 1.7478501054E+07 -0.5781062 115.3974 /L 2022-Mar-01 05:00 06 58 05.24 +07 01 23.2 15.976 n.a. 1.7476448409E+07 -0.5621532 115.2506 /L 2022-Mar-01 06:00 06 57 40.94 +06 59 14.8 15.979 n.a. 1.7474453159E+07 -0.5462233 115.1038 /L 2022-Mar-01 07:00 06 57 16.66 +06 57 06.2 15.983 n.a. 1.7472515220E+07 -0.5303165 114.9570 /L 2022-Mar-01 08:00 06 56 52.38 +06 54 57.6 15.986 n.a. 1.7470634509E+07 -0.5144330 114.8103 /L 2022-Mar-01 09:00 06 56 28.11 +06 52 48.9 15.989 n.a. 1.7468810941E+07 -0.4985728 114.6635 /L 2022-Mar-01 10:00 06 56 03.85 +06 50 40.1 15.993 n.a. 1.7467044433E+07 -0.4827359 114.5169 /L 2022-Mar-01 11:00 06 55 39.59 +06 48 31.2 15.996 n.a. 1.7465334901E+07 -0.4669224 114.3702 /L 2022-Mar-01 12:00 06 55 15.35 +06 46 22.3 15.999 n.a. 1.7463682261E+07 -0.4511325 114.2236 /L 2022-Mar-01 13:00 06 54 51.11 +06 44 13.2 16.003 n.a. 1.7462086426E+07 -0.4353661 114.0769 /L 2022-Mar-01 14:00 06 54 26.88 +06 42 04.1 16.006 n.a. 1.7460547313E+07 -0.4196234 113.9304 /L 2022-Mar-01 15:00 06 54 02.66 +06 39 54.9 16.010 n.a. 1.7459064837E+07 -0.4039044 113.7838 /L 2022-Mar-01 16:00 06 53 38.45 +06 37 45.6 16.013 n.a. 1.7457638911E+07 -0.3882092 113.6373 /L 2022-Mar-01 17:00 06 53 14.25 +06 35 36.2 16.016 n.a. 1.7456269449E+07 -0.3725378 113.4908 /L 2022-Mar-01 18:00 06 52 50.06 +06 33 26.7 16.020 n.a. 1.7454956367E+07 -0.3568904 113.3444 /L 2022-Mar-01 19:00 06 52 25.87 +06 31 17.2 16.023 n.a. 1.7453699577E+07 -0.3412669 113.1980 /L 2022-Mar-01 20:00 06 52 01.70 +06 29 07.6 16.027 n.a. 1.7452498994E+07 -0.3256675 113.0516 /L 2022-Mar-01 21:00 06 51 37.54 +06 26 57.9 16.030 n.a. 1.7451354530E+07 -0.3100922 112.9053 /L 2022-Mar-01 22:00 06 51 13.38 +06 24 48.1 16.034 n.a. 1.7450266099E+07 -0.2945410 112.7590 /L 2022-Mar-01 23:00 06 50 49.23 +06 22 38.3 16.037 n.a. 1.7449233614E+07 -0.2790141 112.6127 /L 2022-Mar-02 00:00 06 50 25.10 +06 20 28.4 16.041 n.a. 1.7448256986E+07 -0.2635115 112.4665 /L 2022-Mar-02 01:00 06 50 00.97 +06 18 18.4 16.044 n.a. 1.7447336130E+07 -0.2480332 112.3203 /L 2022-Mar-02 02:00 06 49 36.85 +06 16 08.4 16.048 n.a. 1.7446470956E+07 -0.2325793 112.1741 /L 2022-Mar-02 03:00 06 49 12.75 +06 13 58.2 16.051 n.a. 1.7445661378E+07 -0.2171499 112.0280 /L 2022-Mar-02 04:00 06 48 48.65 +06 11 48.1 16.055 n.a. 1.7444907306E+07 -0.2017450 111.8819 /L 2022-Mar-02 05:00 06 48 24.57 +06 09 37.8 16.058 n.a. 1.7444208652E+07 -0.1863648 111.7359 /L 2022-Mar-02 06:00 06 48 00.49 +06 07 27.5 16.062 n.a. 1.7443565328E+07 -0.1710091 111.5899 /L 2022-Mar-02 07:00 06 47 36.42 +06 05 17.1 16.065 n.a. 1.7442977245E+07 -0.1556782 111.4439 /L 2022-Mar-02 08:00 06 47 12.37 +06 03 06.7 16.069 n.a. 1.7442444313E+07 -0.1403720 111.2980 /L 2022-Mar-02 09:00 06 46 48.32 +06 00 56.2 16.072 n.a. 1.7441966445E+07 -0.1250906 111.1521 /L 2022-Mar-02 10:00 06 46 24.29 +05 58 45.6 16.076 n.a. 1.7441543549E+07 -0.1098341 111.0063 /L 2022-Mar-02 11:00 06 46 00.27 +05 56 35.0 16.079 n.a. 1.7441175537E+07 -0.0946025 110.8605 /L 2022-Mar-02 12:00 06 45 36.25 +05 54 24.3 16.083 n.a. 1.7440862319E+07 -0.0793959 110.7147 /L 2022-Mar-02 13:00 06 45 12.25 +05 52 13.6 16.087 n.a. 1.7440603805E+07 -0.0642142 110.5690 /L 2022-Mar-02 14:00 06 44 48.26 +05 50 02.8 16.090 n.a. 1.7440399904E+07 -0.0490577 110.4234 /L 2022-Mar-02 15:00 06 44 24.28 +05 47 52.0 16.094 n.a. 1.7440250527E+07 -0.0339263 110.2777 /L 2022-Mar-02 16:00 06 44 00.31 +05 45 41.1 16.098 n.a. 1.7440155583E+07 -0.0188200 110.1322 /L 2022-Mar-02 17:00 06 43 36.36 +05 43 30.1 16.101 n.a. 1.7440114981E+07 -0.0037390 109.9867 /L 2022-Mar-02 18:00 06 43 12.41 +05 41 19.1 16.105 n.a. 1.7440128629E+07 0.0113168 109.8412 /L 2022-Mar-02 19:00 06 42 48.48 +05 39 08.1 16.109 n.a. 1.7440196438E+07 0.0263472 109.6957 /L 2022-Mar-02 20:00 06 42 24.55 +05 36 57.0 16.112 n.a. 1.7440318316E+07 0.0413523 109.5504 /L 2022-Mar-02 21:00 06 42 00.64 +05 34 45.9 16.116 n.a. 1.7440494171E+07 0.0563319 109.4050 /L 2022-Mar-02 22:00 06 41 36.74 +05 32 34.7 16.120 n.a. 1.7440723912E+07 0.0712861 109.2597 /L 2022-Mar-02 23:00 06 41 12.86 +05 30 23.5 16.123 n.a. 1.7441007447E+07 0.0862147 109.1145 /L 2022-Mar-03 00:00 06 40 48.98 +05 28 12.2 16.127 n.a. 1.7441344684E+07 0.1011178 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 **********************************************************************************************************