2018-02-09, GMT 22:27

Object Data Page

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******************************************************************************* Ephemeris / WWW_USER Mon Feb 12 11:17:19 2018 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2018 CB) {source: JPL#28} Center body name: Earth (399) {source: DE431} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2018-Feb-09 22:25:00.0000 UT Stop time : A.D. 2018-Feb-09 22:35:00.0000 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 +} 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.180209.p180503 EOP coverage : DATA-BASED 1962-JAN-20 TO 2018-FEB-09. PREDICTS-> 2018-MAY-02 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= 2458156.5 ! 2018-Feb-07.00 (TDB) Residual RMS= .54405 EC= .2618733281727132 QR= .9306728489732728 TP= 2458196.0363818235 OM= 320.930337107952 W= 223.2888935436705 IN= 5.155842082712129 Equivalent ICRF heliocentric equatorial cartesian coordinates (au, au/d): X=-7.356832743569909E-01 Y= 6.128779736040405E-01 Z= 2.712881326857324E-01 VX=-1.033881768965444E-02 VY=-1.383818579319296E-02 VZ=-7.848192105771128E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 25.901 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ******************************************************************************************************* Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O ******************************************************************************************************* $$SOE 2018-Feb-09 22:25 00 41 51.66 +13 37 17.7 14. 0.00046621263712 -0.0979834 54.5456 /T 125.4315 2018-Feb-09 22:26 00 40 57.03 +13 20 23.0 15. 0.00046618146931 -0.0574238 54.2140 /T 125.7633 2018-Feb-09 22:27 00 40 02.52 +13 03 27.5 15. 0.00046616657167 -0.0168580 53.8825 /T 126.0949 2018-Feb-09 22:28 00 39 08.14 +12 46 31.2 15. 0.00046616794580 0.0237096 53.5513 /T 126.4262 2018-Feb-09 22:29 00 38 13.88 +12 29 34.3 15. 0.00046618559152 0.0642746 53.2203 /T 126.7573 2018-Feb-09 22:30 00 37 19.74 +12 12 36.9 15. 0.00046621950690 0.1048326 52.8896 /T 127.0880 2018-Feb-09 22:31 00 36 25.73 +11 55 38.9 15. 0.00046626968821 0.1453792 52.5593 /T 127.4185 2018-Feb-09 22:32 00 35 31.84 +11 38 40.6 15. 0.00046633612997 0.1859099 52.2292 /T 127.7486 2018-Feb-09 22:33 00 34 38.08 +11 21 42.0 15. 0.00046641882494 0.2264204 51.8996 /T 128.0783 2018-Feb-09 22:34 00 33 44.45 +11 04 43.1 15. 0.00046651776409 0.2669062 51.5704 /T 128.4077 2018-Feb-09 22:35 00 32 50.95 +10 47 44.2 15. 0.00046663293665 0.3073631 51.2416 /T 128.7366 $$EOE ******************************************************************************************************* Column meaning: TIME Prior to 1962, times are UT1. Dates thereafter are UTC. 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. Time tags refer to the same instant throughout the solar system, regardless of where the observer is located. For example, if an observation from the surface of another body has an output time-tag of 12:31:00 UTC, an Earth-based time-scale, it refers to the instant on that body simultaneous to 12:31:00 UTC on Earth. The Barycentric Dynamical Time scale (TDB) is used internally as defined by the planetary equations of motion. Conversion between TDB and the selected non-uniform UT output time-scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used as a constant over future intervals. NOTE: "n.a." in output means quantity "not available" at the print-time. R.A._(ICRF/J2000.0)_DEC = J2000.0 astrometric right ascension and declination of target center. Adjusted for light-time. Units: HMS (HH MM SS.ff) and DMS (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 *******************************************************************************************************