1986-03-25, GMT 18, 1hours

Object Data Page

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******************************************************************************* Ephemeris / WWW_USER Fri Aug 23 07:51:55 2019 Pasadena, USA / Horizons ******************************************************************************* Target body name: 162173 Ryugu (1999 JU3) {source: JPL#120} Center body name: Earth (399) {source: DE431} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1986-Mar-25 18:00:00.0000 UT Stop time : A.D. 1986-Mar-25 19:00:00.0000 UT Step-size : 1 minutes ******************************************************************************* Target pole/equ : No model available Target radii : (unavailable) Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : High-precision EOP model {East-longitude positive} Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE431} Rel. light bend : Sun, EARTH {source: DE431} Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2 Small-body perts: Yes {source: SB431-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL EOP file : eop.190822.p191113 EOP coverage : DATA-BASED 1962-JAN-20 TO 2019-AUG-22. PREDICTS-> 2019-NOV-12 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= 2455907.5 ! 2011-Dec-12.00 (TDB) Residual RMS= .30546 EC= .1902257533711703 QR= .9633081094119196 TP= 2455902.2563366606 OM= 251.6197109778495 W= 211.4258497031505 IN= 5.883742390778817 Equivalent ICRF heliocentric equatorial cartesian coordinates (au, au/d): X=-3.110574563985249E-01 Y= 8.593388225070249E-01 Z= 3.071612761016043E-01 VX=-1.808963327297997E-02 VY=-4.829575481927901E-03 VZ=-3.811446171459336E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 7.627 H= 19.3 G= .150 B-V= n.a. ALBEDO= n.a. STYP= Cg Asteroid non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= 0. A1= 0. A2= -3.371880211489E-14 A3= 0. Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 5.093 R0= 1. ******************************************************************************************************* Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O ******************************************************************************************************* $$SOE 1986-Mar-25 18:00 14 09 37.49 -45 35 00.4 17.75 0.20167279777914 -0.0014492 130.0318 /L 42.1675 1986-Mar-25 18:01 14 09 37.42 -45 34 59.6 17.75 0.20167279720574 -0.0014103 130.0326 /L 42.1668 1986-Mar-25 18:02 14 09 37.35 -45 34 58.9 17.75 0.20167279664795 -0.0013714 130.0334 /L 42.1661 1986-Mar-25 18:03 14 09 37.28 -45 34 58.1 17.75 0.20167279610572 -0.0013325 130.0342 /L 42.1654 1986-Mar-25 18:04 14 09 37.21 -45 34 57.3 17.75 0.20167279557912 -0.0012936 130.0350 /L 42.1647 1986-Mar-25 18:05 14 09 37.14 -45 34 56.5 17.75 0.20167279506814 -0.0012547 130.0358 /L 42.1640 1986-Mar-25 18:06 14 09 37.07 -45 34 55.7 17.75 0.20167279457273 -0.0012158 130.0367 /L 42.1633 1986-Mar-25 18:07 14 09 37.00 -45 34 54.9 17.75 0.20167279409294 -0.0011769 130.0375 /L 42.1626 1986-Mar-25 18:08 14 09 36.93 -45 34 54.1 17.75 0.20167279362875 -0.0011380 130.0383 /L 42.1619 1986-Mar-25 18:09 14 09 36.85 -45 34 53.3 17.75 0.20167279318018 -0.0010990 130.0391 /L 42.1611 1986-Mar-25 18:10 14 09 36.78 -45 34 52.6 17.75 0.20167279274721 -0.0010601 130.0399 /L 42.1604 1986-Mar-25 18:11 14 09 36.71 -45 34 51.8 17.74 0.20167279232985 -0.0010212 130.0407 /L 42.1597 1986-Mar-25 18:12 14 09 36.64 -45 34 51.0 17.74 0.20167279192810 -0.0009823 130.0415 /L 42.1590 1986-Mar-25 18:13 14 09 36.57 -45 34 50.2 17.74 0.20167279154196 -0.0009434 130.0424 /L 42.1583 1986-Mar-25 18:14 14 09 36.50 -45 34 49.4 17.74 0.20167279117144 -0.0009044 130.0432 /L 42.1576 1986-Mar-25 18:15 14 09 36.43 -45 34 48.6 17.74 0.20167279081652 -0.0008655 130.0440 /L 42.1569 1986-Mar-25 18:16 14 09 36.36 -45 34 47.8 17.74 0.20167279047721 -0.0008265 130.0448 /L 42.1562 1986-Mar-25 18:17 14 09 36.29 -45 34 47.1 17.74 0.20167279015354 -0.0007876 130.0456 /L 42.1555 1986-Mar-25 18:18 14 09 36.22 -45 34 46.3 17.74 0.20167278984548 -0.0007487 130.0464 /L 42.1548 1986-Mar-25 18:19 14 09 36.15 -45 34 45.5 17.74 0.20167278955304 -0.0007097 130.0473 /L 42.1541 1986-Mar-25 18:20 14 09 36.08 -45 34 44.7 17.74 0.20167278927621 -0.0006708 130.0481 /L 42.1534 1986-Mar-25 18:21 14 09 36.00 -45 34 43.9 17.74 0.20167278901501 -0.0006318 130.0489 /L 42.1527 1986-Mar-25 18:22 14 09 35.93 -45 34 43.1 17.74 0.20167278876944 -0.0005929 130.0497 /L 42.1520 1986-Mar-25 18:23 14 09 35.86 -45 34 42.3 17.74 0.20167278853947 -0.0005539 130.0505 /L 42.1513 1986-Mar-25 18:24 14 09 35.79 -45 34 41.6 17.74 0.20167278832513 -0.0005149 130.0513 /L 42.1505 1986-Mar-25 18:25 14 09 35.72 -45 34 40.8 17.74 0.20167278812643 -0.0004760 130.0521 /L 42.1498 1986-Mar-25 18:26 14 09 35.65 -45 34 40.0 17.74 0.20167278794335 -0.0004370 130.0530 /L 42.1491 1986-Mar-25 18:27 14 09 35.58 -45 34 39.2 17.74 0.20167278777591 -0.0003980 130.0538 /L 42.1484 1986-Mar-25 18:28 14 09 35.51 -45 34 38.4 17.74 0.20167278762406 -0.0003591 130.0546 /L 42.1477 1986-Mar-25 18:29 14 09 35.44 -45 34 37.6 17.74 0.20167278748789 -0.0003201 130.0554 /L 42.1470 1986-Mar-25 18:30 14 09 35.37 -45 34 36.8 17.74 0.20167278736732 -0.0002811 130.0562 /L 42.1463 1986-Mar-25 18:31 14 09 35.30 -45 34 36.0 17.74 0.20167278726241 -0.0002421 130.0570 /L 42.1456 1986-Mar-25 18:32 14 09 35.23 -45 34 35.3 17.74 0.20167278717310 -0.0002032 130.0578 /L 42.1449 1986-Mar-25 18:33 14 09 35.15 -45 34 34.5 17.74 0.20167278709944 -0.0001642 130.0587 /L 42.1442 1986-Mar-25 18:34 14 09 35.08 -45 34 33.7 17.74 0.20167278704142 -0.0001252 130.0595 /L 42.1435 1986-Mar-25 18:35 14 09 35.01 -45 34 32.9 17.74 0.20167278699903 -0.0000862 130.0603 /L 42.1428 1986-Mar-25 18:36 14 09 34.94 -45 34 32.1 17.74 0.20167278697228 -0.0000472 130.0611 /L 42.1421 1986-Mar-25 18:37 14 09 34.87 -45 34 31.3 17.74 0.20167278696118 -0.0000082 130.0619 /L 42.1414 1986-Mar-25 18:38 14 09 34.80 -45 34 30.5 17.74 0.20167278696572 0.0000308 130.0627 /L 42.1407 1986-Mar-25 18:39 14 09 34.73 -45 34 29.7 17.74 0.20167278698589 0.0000698 130.0636 /L 42.1399 1986-Mar-25 18:40 14 09 34.66 -45 34 29.0 17.74 0.20167278702171 0.0001088 130.0644 /L 42.1392 1986-Mar-25 18:41 14 09 34.59 -45 34 28.2 17.74 0.20167278707318 0.0001478 130.0652 /L 42.1385 1986-Mar-25 18:42 14 09 34.52 -45 34 27.4 17.74 0.20167278714030 0.0001868 130.0660 /L 42.1378 1986-Mar-25 18:43 14 09 34.45 -45 34 26.6 17.74 0.20167278722305 0.0002259 130.0668 /L 42.1371 1986-Mar-25 18:44 14 09 34.38 -45 34 25.8 17.74 0.20167278732145 0.0002649 130.0676 /L 42.1364 1986-Mar-25 18:45 14 09 34.30 -45 34 25.0 17.74 0.20167278743551 0.0003039 130.0684 /L 42.1357 1986-Mar-25 18:46 14 09 34.23 -45 34 24.2 17.74 0.20167278756523 0.0003429 130.0693 /L 42.1350 1986-Mar-25 18:47 14 09 34.16 -45 34 23.5 17.74 0.20167278771057 0.0003820 130.0701 /L 42.1343 1986-Mar-25 18:48 14 09 34.09 -45 34 22.7 17.74 0.20167278787159 0.0004210 130.0709 /L 42.1336 1986-Mar-25 18:49 14 09 34.02 -45 34 21.9 17.74 0.20167278804825 0.0004600 130.0717 /L 42.1329 1986-Mar-25 18:50 14 09 33.95 -45 34 21.1 17.74 0.20167278824057 0.0004991 130.0725 /L 42.1322 1986-Mar-25 18:51 14 09 33.88 -45 34 20.3 17.74 0.20167278844855 0.0005381 130.0733 /L 42.1315 1986-Mar-25 18:52 14 09 33.81 -45 34 19.5 17.74 0.20167278867218 0.0005771 130.0742 /L 42.1308 1986-Mar-25 18:53 14 09 33.74 -45 34 18.7 17.74 0.20167278891147 0.0006162 130.0750 /L 42.1301 1986-Mar-25 18:54 14 09 33.67 -45 34 17.9 17.74 0.20167278916642 0.0006552 130.0758 /L 42.1293 1986-Mar-25 18:55 14 09 33.60 -45 34 17.2 17.74 0.20167278943705 0.0006943 130.0766 /L 42.1286 1986-Mar-25 18:56 14 09 33.52 -45 34 16.4 17.74 0.20167278972333 0.0007333 130.0774 /L 42.1279 1986-Mar-25 18:57 14 09 33.45 -45 34 15.6 17.74 0.20167279002526 0.0007724 130.0782 /L 42.1272 1986-Mar-25 18:58 14 09 33.38 -45 34 14.8 17.74 0.20167279034286 0.0008115 130.0790 /L 42.1265 1986-Mar-25 18:59 14 09 33.31 -45 34 14.0 17.74 0.20167279067614 0.0008505 130.0799 /L 42.1258 1986-Mar-25 19:00 14 09 33.24 -45 34 13.2 17.74 0.20167279102507 0.0008896 130.0807 /L 42.1251 $$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 by introduction of integer leap-seconds for 1972 and later. Conversion from the internal Barycentric Dynamical Time (TDB) 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 on Earth regardless of where the observer is located in the solar system. For example, if an observation from the surface of another body has an output time-tag of 12:31:00 UT, it refers to a time-scale conversion from TDB to UT valid at the center of the Earth at that instant, not the observer's location elsewhere in the solar system, where clock rates may differ slightly due to the local gravity field and there is no precisely defined or adopted "UT" analog. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. NOTE: "n.a." in output means quantity "not available" at the print-time. R.A._(ICRF/J2000.0)_DEC = Astrometric right ascension and declination of the TARGET CENTER with respect to the observing site in the coordinates of the ICRF/J2000 inertial reference frame. Compensated for down-leg light-time. Units: RA in hours-minutes-seconds of time (HH MM SS.ff), DEC in angular degrees-minutes-seconds (DD MM SS.f) APmag = Asteroid's approximate apparent visual magnitude from the standard IAU H-G magnitude relationship: APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi1 + G*phi2). 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. Units: MAGNITUDE delta deldot = Range ("delta") and range-rate ("delta-dot") of target center with respect to the observer at the instant light seen by the observer at print-time would have left the target center (print-time minus down-leg light-time); the distance traveled by a light ray emanating from the center of the target and recorded by the observer at print-time. "deldot" is a projection of the velocity vector along this ray, the light-time-corrected line-of-sight from the coordinate center, and indicates relative motion. A positive "deldot" means the target center is moving away from the observer (coordinate center). A negative "deldot" means the target center is moving toward the observer. Units: AU and KM/S S-O-T /r = Sun-Observer-Target angle; target's apparent SOLAR ELONGATION seen from the observer location at print-time. Angular units: DEGREES The '/r' column indicates the target's apparent position relative to the Sun in the observer's sky, as described below: For an observing location on the surface of a rotating body (considering its rotational sense): /T indicates target TRAILS Sun (evening sky; rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky; rises and sets BEFORE Sun) For an observing point NOT on a rotating body (such as a spacecraft), the "leading" and "trailing" condition is defined by the observer's heliocentric orbital motion: if continuing in the observer's current direction of heliocentric motion would encounter the target's 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 target's, the target TRAILS the Sun. NOTE: 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 are defined in the equator of a spherical coordinate system. S-T-O = "S-T-O" is the Sun->Target->Observer angle; the interior vertex angle at target center formed by a vector to the apparent center of the Sun at reflection time on the target and the apparent vector 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 Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA Information: http://ssd.jpl.nasa.gov/ Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser) telnet ssd.jpl.nasa.gov 6775 (via command-line) Author : Jon.D.Giorgini@jpl.nasa.gov *******************************************************************************************************