******************************************************************************* JPL/HORIZONS 4486 Mithra (1987 SB) 2024-May-10 06:45:19 Rec #: 4486 (+COV) Soln.date: 2024-Jan-04_06:05:42 # obs: 1873 (1987-2023) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2458044.5 ! 2017-Oct-18.00 (TDB) Residual RMS= .2284 EC= .6628679357364415 QR= .7416851524912941 TP= 2457696.1572245997 OM= 82.24025117905666 W= 168.8749363379732 IN= 3.039485512343104 A= 2.199984015496876 MA= 105.2159530957255 ADIST= 3.658282878502457 PER= 3.26315 N= .30204718 ANGMOM= .019103815 DAN= 3.52793 DDN= .7472800000000001 L= 251.1304483 B= .5862076000000001 MOID= .0463385 TP= 2016-Nov-03.6572245997 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= .9245 ROTPER= 67.5 H= 15.61 G= .150 B-V= n.a. ALBEDO= .297 STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#362, PHA OCC=0 radar( 8 delay, 9 Dop.) 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri May 10 06:45:19 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 4486 Mithra (1987 SB) {source: JPL#362} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2023-Apr-11 16:49:00.0000 UT Stop time : A.D. 2023-Apr-12 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 0.924 km Center geodetic : 0.0, 0.0, -6378.137 {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 : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} 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.240509.p240802 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-09. PREDICTS-> 2024-AUG-01 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= 2458044.5 ! 2017-Oct-18.00 (TDB) Residual RMS= .2284 EC= .6628679357364415 QR= .7416851524912941 TP= 2457696.1572245997 OM= 82.24025117905666 W= 168.8749363379732 IN= 3.039485512343104 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 2.095077755933560E+00 Y= 2.247798204286951E+00 Z= 8.732280284338679E-01 VX=-1.963789402728833E-03 VY= 6.221317891392093E-03 VZ= 2.863387370672208E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= .9245 ROTPER= 67.5 H= 15.61 G= .150 B-V= n.a. ALBEDO= .297 STYP= n.a. ******************************************************************************* Date__(UT)__HR:MN delta deldot RNG_3sigma RNGRT_3sig ************************************************************************** $$SOE 2023-Apr-11 16:49 0.16267840440075 -0.0013379 32.6415 0.0000051 $$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. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% (1-D) or 98.9% (2-D) chance the actual value is within given bounds. These statistical calculations assume observational data errors are random. If there are systematic biases (such as timing, reduction or star-catalog errors), results can be optimistic. Because the epoch covariance is mapped using linearized variational partial derivatives, results can also be optimistic for times far from the solution epoch, particularly for objects having close planetary encounters. '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: AU and KM/S 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, KM/S 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 ******************************************************************************* !$$SOF COMMAND = '4486' START_TIME = '2023-04-11 16:49' STOP_TIME = '2023-04-12' STEP_SIZE = '1 day' QUANTITIES = '20,39'