2008-07-13 to 15

Object Data Page

Results

******************************************************************************* Ephemeris / WWW_USER Sun Oct 14 02:26:15 2012 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2008 BT18) {source: JPL#60} Center body name: Earth (399) {source: DE405} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2008-Jul-13 00:00:00.0000 UT Stop time : A.D. 2008-Jul-15 00:00:00.0000 UT Step-size : 60 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 {source: DE405} Interfering body: MOON (Req= 1737.400) km {source: DE405} Deflecting body : Sun, EARTH {source: DE405} Deflecting GMs : 1.3271E+11, 3.9860E+05 km^3/s^2 Small perturbers: Ceres, Pallas, Vesta {source: SB405-CPV-2} Small body GMs : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL EOP file : eop.121012.p130103 EOP coverage : DATA-BASED 1962-JAN-20 TO 2012-OCT-12. PREDICTS-> 2013-JAN-02 Units conversion: 1 AU= 149597870.691 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 ) ******************************************************************************* Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG): EPOCH= 2454496.5 ! 2008-Jan-31.00 (CT) Residual RMS= .38965 EC= .596977301124438 QR= .8944278978529471 TP= 2454628.368901574 OM= 107.8886345745145 W= 139.0360425909204 IN= 8.149852443704141 Asteroid physical parameters (KM, SEC, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= 2.726 H= 18.235 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 2008-Jul-13 00:00 07 36 00.87 -00 32 50.5 n.a. 0.01941007759219 -8.2253555 22.4107 /T 157.1654 2008-Jul-13 01:00 07 34 09.07 -01 06 26.3 n.a. 0.01921368973342 -8.0952033 22.9384 /T 156.6328 2008-Jul-13 02:00 07 32 14.94 -01 40 42.9 n.a. 0.01902048194346 -7.9610720 23.4890 /T 156.0770 2008-Jul-13 03:00 07 30 18.42 -02 15 40.8 n.a. 0.01883055112865 -7.8228663 24.0623 /L 155.4983 2008-Jul-13 04:00 07 28 19.44 -02 51 20.3 n.a. 0.01864399645975 -7.6804935 24.6584 /L 154.8965 2008-Jul-13 05:00 07 26 17.96 -03 27 41.8 n.a. 0.01846091930286 -7.5338637 25.2773 /L 154.2719 2008-Jul-13 06:00 07 24 13.90 -04 04 45.4 n.a. 0.01828142314811 -7.3828905 25.9187 /L 153.6244 2008-Jul-13 07:00 07 22 07.21 -04 42 31.2 n.a. 0.01810561351383 -7.2274918 26.5827 /L 152.9541 2008-Jul-13 08:00 07 19 57.83 -05 20 59.4 n.a. 0.01793359783035 -7.0675907 27.2691 /L 152.2613 2008-Jul-13 09:00 07 17 45.69 -06 00 09.9 n.a. 0.01776548531266 -6.9031161 27.9778 /L 151.5460 2008-Jul-13 10:00 07 15 30.73 -06 40 02.6 n.a. 0.01760138680778 -6.7340035 28.7086 /L 150.8084 2008-Jul-13 11:00 07 13 12.89 -07 20 37.2 n.a. 0.01744141461945 -6.5601962 29.4614 /L 150.0487 2008-Jul-13 12:00 07 10 52.10 -08 01 53.4 n.a. 0.01728568231538 -6.3816461 30.2359 /L 149.2672 2008-Jul-13 13:00 07 08 28.29 -08 43 50.8 n.a. 0.01713430450823 -6.1983147 31.0319 /L 148.4639 2008-Jul-13 14:00 07 06 01.40 -09 26 28.8 n.a. 0.01698739661225 -6.0101738 31.8492 /L 147.6393 2008-Jul-13 15:00 07 03 31.37 -10 09 46.5 n.a. 0.01684507457880 -5.8172070 32.6874 /L 146.7936 2008-Jul-13 16:00 07 00 58.14 -10 53 43.3 n.a. 0.01670745460406 -5.6194106 33.5463 /L 145.9271 2008-Jul-13 17:00 06 58 21.62 -11 38 18.1 n.a. 0.01657465281492 -5.4167941 34.4255 /L 145.0403 2008-Jul-13 18:00 06 55 41.77 -12 23 29.6 n.a. 0.01644678492958 -5.2093819 35.3246 /L 144.1334 2008-Jul-13 19:00 06 52 58.53 -13 09 16.6 n.a. 0.01632396589513 -4.9972138 36.2431 /L 143.2069 2008-Jul-13 20:00 06 50 11.81 -13 55 37.6 n.a. 0.01620630950327 -4.7803462 37.1807 /L 142.2613 2008-Jul-13 21:00 06 47 21.58 -14 42 30.9 n.a. 0.01609392798513 -4.5588524 38.1368 /L 141.2971 2008-Jul-13 22:00 06 44 27.77 -15 29 54.7 n.a. 0.01598693158750 -4.3328240 39.1108 /L 140.3149 2008-Jul-13 23:00 06 41 30.31 -16 17 46.9 n.a. 0.01588542813275 -4.1023709 40.1022 /L 139.3152 2008-Jul-14 00:00 06 38 29.17 -17 06 05.3 n.a. 0.01578952256531 -3.8676224 41.1104 /L 138.2987 2008-Jul-14 01:00 06 35 24.28 -17 54 47.6 n.a. 0.01569931648801 -3.6287269 42.1346 /L 137.2660 2008-Jul-14 02:00 06 32 15.60 -18 43 51.2 n.a. 0.01561490769198 -3.3858526 43.1742 /L 136.2179 2008-Jul-14 03:00 06 29 03.09 -19 33 13.5 n.a. 0.01553638968429 -3.1391873 44.2284 /L 135.1552 2008-Jul-14 04:00 06 25 46.69 -20 22 51.4 n.a. 0.01546385121773 -2.8889383 45.2964 /L 134.0786 2008-Jul-14 05:00 06 22 26.39 -21 12 41.9 n.a. 0.01539737582769 -2.6353317 46.3773 /L 132.9890 2008-Jul-14 06:00 06 19 02.14 -22 02 42.0 n.a. 0.01533704138078 -2.3786123 47.4702 /L 131.8874 2008-Jul-14 07:00 06 15 33.93 -22 52 48.1 n.a. 0.01528291964114 -2.1190424 48.5743 /L 130.7745 2008-Jul-14 08:00 06 12 01.73 -23 42 56.8 n.a. 0.01523507585821 -1.8569008 49.6885 /L 129.6515 2008-Jul-14 09:00 06 08 25.54 -24 33 04.6 n.a. 0.01519356838354 -1.5924818 50.8119 /L 128.5192 2008-Jul-14 10:00 06 04 45.35 -25 23 07.8 n.a. 0.01515844831872 -1.3260933 51.9435 /L 127.3787 2008-Jul-14 11:00 06 01 01.15 -26 13 02.6 n.a. 0.01512975920062 -1.0580556 53.0822 /L 126.2311 2008-Jul-14 12:00 05 57 12.98 -27 02 45.1 n.a. 0.01510753673090 -0.7886995 54.2269 /L 125.0774 2008-Jul-14 13:00 05 53 20.84 -27 52 11.6 n.a. 0.01509180854748 -0.5183641 55.3765 /L 123.9188 2008-Jul-14 14:00 05 49 24.77 -28 41 18.1 n.a. 0.01508259404566 -0.2473948 56.5300 /L 122.7562 2008-Jul-14 15:00 05 45 24.82 -29 30 00.8 n.a. 0.01507990425532 0.0238587 57.6863 /L 121.5909 2008-Jul-14 16:00 05 41 21.02 -30 18 15.7 n.a. 0.01508374176458 0.2950450 58.8442 /L 120.4238 2008-Jul-14 17:00 05 37 13.46 -31 05 59.1 13.94 0.01509410069993 0.5658127 60.0027 /L 119.2562 2008-Jul-14 18:00 05 33 02.20 -31 53 07.3 13.85 0.01511096676856 0.8358135 61.1607 /L 118.0891 2008-Jul-14 19:00 05 28 47.33 -32 39 36.4 13.77 0.01513431734257 1.1047035 62.3170 /L 116.9236 2008-Jul-14 20:00 05 24 28.96 -33 25 23.1 13.70 0.01516412160425 1.3721461 63.4707 /L 115.7607 2008-Jul-14 21:00 05 20 07.19 -34 10 23.9 13.63 0.01520034074260 1.6378138 64.6207 /L 114.6015 2008-Jul-14 22:00 05 15 42.15 -34 54 35.5 13.56 0.01524292819087 1.9013900 65.7660 /L 113.4469 2008-Jul-14 23:00 05 11 13.98 -35 37 54.9 13.49 0.01529182991809 2.1625709 66.9057 /L 112.2980 2008-Jul-15 00:00 05 06 42.83 -36 20 19.1 13.43 0.01534698475252 2.4210670 68.0387 /L 111.1557 $$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 universe, regardless of where the observer is located. The uniform Coordinate Time scale is used internally. It is equivalent to the current IAU definition of "TDB". Conversion between CT and the selected non-uniform UT output scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used over any future interval. 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. Corrected for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f) APmag = Asteroid's approximate apparent visual magnitude by following definition: APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi1 + G*phi2). In principle, accurate to ~ +/- 0.1 magnitude. For solar phase angles > 90 deg, the error could exceed 1 magnitude. No values are output for phase angles greater than 120 degrees, since the extrapolation error could be large and unknown. Units: NONE 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 observer location at print-time. If negative, the target center is behind the Sun. Angular units: DEGREES. The '/r' column is a Sun-relative code, output for observing sites with defined rotation models only. /T indicates target trails Sun (evening sky) /L indicates target leads Sun (morning sky) NOTE: The S-O-T solar elongation angle is the total separation in any direction. It does not indicate the angle of Sun leading or trailing. S-T-O = Sun-Target-Observer (~ PHASE ANGLE) angle: the vertex angle at target center formed by a vector to the apparent center of the Sun and a vector intersecting the observer at print-time. This measurable angle is within 20 arcseconds (0.006 deg) of the reduced PHASE ANGLE at observer's location at print time. The difference is due to down-leg stellar aberration affecting measured target position but not apparent solar illumination direction. When computing phase, Horizons uses the true phase angle, not S-T-O, but the resulting difference in illuminated fraction is less than 0.001%. 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.Giorgini@jpl.nasa.gov *******************************************************************************************************