2, 2029-04-13 to 2029-04-14, Step=1 h

Object Data Page

Results

******************************************************************************* Ephemeris / WWW_USER Thu May 2 09:20:47 2019 Pasadena, USA / Horizons ******************************************************************************* Target body name: 99942 Apophis (2004 MN4) {source: JPL#199} Center body name: Earth (399) {source: DE431} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2029-Apr-13 00:00:00.0000 UT Stop time : A.D. 2029-Apr-14 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : No model available Target radii : 0.2 km 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.190501.p190723 EOP coverage : DATA-BASED 1962-JAN-20 TO 2019-MAY-01. PREDICTS-> 2019-JUL-22 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= 2454733.5 ! 2008-Sep-24.00 (TDB) Residual RMS= .17383 EC= .1911953048308701 QR= .7460724295867941 TP= 2454894.9125195034 OM= 204.4460289189818 W= 126.401879524849 IN= 3.331369520013644 Equivalent ICRF heliocentric equatorial cartesian coordinates (au, au/d): X=-9.617610121438336E-01 Y= 5.056402470928835E-01 Z= 1.634216613600531E-01 VX=-7.112764893524261E-03 VY=-1.205930258845442E-02 VZ=-4.668804545027994E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= .1625 ROTPER= 30.4 H= 19.7 G= .250 B-V= n.a. ALBEDO= .230 STYP= Sq Asteroid non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= 0. A1= 0. A2= -5.592839897872E-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 S-brt delta deldot S-O-T /r S-T-O ************************************************************************************************************** $$SOE 2029-Apr-13 00:00 13 53 15.38 -28 14 11.5 8.15 3.56 0.00323012480163 -5.9551460 159.5571 /L 20.3782 2029-Apr-13 01:00 13 52 13.55 -28 06 43.5 8.04 3.56 0.00308677518209 -5.9587106 159.7781 /L 20.1607 2029-Apr-13 02:00 13 51 05.85 -27 58 29.7 7.93 3.55 0.00294333697589 -5.9625043 160.0159 /L 19.9263 2029-Apr-13 03:00 13 49 51.40 -27 49 22.8 7.82 3.54 0.00279980451411 -5.9665392 160.2728 /L 19.6729 2029-Apr-13 04:00 13 48 29.15 -27 39 13.7 7.69 3.54 0.00265617186504 -5.9708247 160.5513 /L 19.3978 2029-Apr-13 05:00 13 46 57.78 -27 27 51.1 7.56 3.53 0.00251243292191 -5.9753653 160.8546 /L 19.0980 2029-Apr-13 06:00 13 45 15.68 -27 15 01.2 7.43 3.52 0.00236858156266 -5.9801568 161.1864 /L 18.7696 2029-Apr-13 07:00 13 43 20.85 -27 00 25.9 7.28 3.51 0.00222461192795 -5.9851801 161.5508 /L 18.4086 2029-Apr-13 08:00 13 41 10.71 -26 43 42.3 7.12 3.50 0.00208051889423 -5.9903907 161.9530 /L 18.0098 2029-Apr-13 09:00 13 38 41.98 -26 24 19.9 6.95 3.49 0.00193629887436 -5.9957014 162.3985 /L 17.5677 2029-Apr-13 10:00 13 35 50.34 -26 01 38.3 6.77 3.47 0.00179195117785 -6.0009518 162.8936 /L 17.0759 2029-Apr-13 11:00 13 32 30.02 -25 34 41.7 6.57 3.46 0.00164748035172 -6.0058548 163.4444 /L 16.5284 2029-Apr-13 12:00 13 28 33.13 -25 02 11.9 6.35 3.44 0.00150290029107 -6.0098979 164.0552 /L 15.9208 2029-Apr-13 13:00 13 23 48.61 -24 22 15.7 6.11 3.42 0.00135824166287 -6.0121561 164.7244 /T 15.2548 2029-Apr-13 14:00 13 18 00.39 -23 32 02.5 5.85 3.40 0.00121356581193 -6.0109166 165.4333 /T 14.5489 2029-Apr-13 15:00 13 10 44.31 -22 27 05.2 5.55 3.38 0.00106899204791 -6.0028832 166.1193 /T 13.8657 2029-Apr-13 16:00 13 01 22.30 -21 00 01.7 5.22 3.37 0.00092475442267 -5.9813675 166.6078 /T 13.3797 2029-Apr-13 17:00 12 48 50.81 -18 57 52.7 4.86 3.37 0.00078132892937 -5.9317977 166.4567 /T 13.5327 2029-Apr-13 18:00 12 31 16.00 -15 55 54.5 4.48 3.42 0.00063974621590 -5.8193322 164.6888 /T 15.3016 2029-Apr-13 19:00 12 04 54.63 -11 02 42.5 4.10 3.56 0.00050245315542 -5.5503377 159.5222 /T 20.4679 2029-Apr-13 20:00 11 21 39.81 -02 24 33.2 3.79 3.82 0.00037599159806 -4.8409192 147.8830 /T 32.1058 2029-Apr-13 21:00 10 02 28.06 +13 24 04.8 3.76 4.26 0.00027943710385 -2.8610533 124.1723 /T 55.8148 2029-Apr-13 22:00 07 37 17.71 +33 19 00.1 4.84 4.98 0.00025539605406 1.0533735 86.7976 /T 93.1880 2029-Apr-13 23:00 04 55 36.74 +39 20 32.1 7. 6. 0.00032193220610 4.0945119 54.9569 /T 125.0281 2029-Apr-14 00:00 03 22 32.27 +36 14 01.2 10. 7. 0.00043724092213 5.2844783 37.3415 /T 142.6433 $$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 TDB timescale to the non-uniform 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 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, not the actual observer location elsewhere in the solar system, where clock rates may differ slightly due to the local spacetime metric 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 S-brt = Asteroid's approximate apparent visual magnitude & surface brightness: 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 the errors could be large and unknown. Units: NONE & VISUAL MAGNITUDES PER SQUARE ARCSECOND 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 **************************************************************************************************************