API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS (2024 YR4) 2025-Feb-18 19:09:03 Rec #:50662711 (+COV) Soln.date: 2025-Feb-18_06:02:50 # obs: 370 (2024-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2460694.5 ! 2025-Jan-19.00 (TDB) Residual RMS= .058205 EC= .6616221997710975 QR= .8515151228154074 TP= 2460636.9245929127 OM= 271.3680439745675 W= 134.3641851542753 IN= 3.408344156920807 A= 2.516462729645334 MA= 14.21527734373284 ADIST= 4.18141033647526 PER= 3.99203 N= .246898425 ANGMOM= .020461797 DAN= 2.63294 DDN= .96737 L= 45.7829354 B= 2.4359559 MOID= .00275238 TP= 2024-Nov-22.4245929127 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 23.96 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#57, OCC=4 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Tue Feb 18 19:09:03 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2024 YR4) {source: JPL#57} Center body name: Earth (399) {source: DE441} Center-site name: AUTH Observatory, Thessaloniki ******************************************************************************* Start time : A.D. 2032-Dec-16 00:00:00.0000 UT+03:00 Stop time : A.D. 2032-Dec-24 00:00:00.0000 UT+03:00 Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 22.9589, 40.6307043, .0900545 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 22.9589, 4847.46468, 4131.4444 {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 Time zone : UT+03:00 EOP file : eop.250218.p250517 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-FEB-18. PREDICTS-> 2025-MAY-16 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation ( 0.0deg=YES),Airmass (>38.000=NO), Daylight (YES) 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= 2460694.5 ! 2025-Jan-19.00 (TDB) Residual RMS= .058205 EC= .6616221997710975 QR= .8515151228154074 TP= 2460636.9245929127 OM= 271.3680439745675 W= 134.3641851542753 IN= 3.408344156920807 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-5.738286718692471E-01 Y= 9.667614505138891E-01 Z= 3.835147637360040E-01 VX=-1.947289938855034E-02 VY= 1.691729948467245E-04 VZ=-1.190844473922277E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 23.96 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ***************************************************************************************************************************************************************************************************** Date_(ZONE)_HR:MN R.A._____(ICRF)_____DEC Azi____(a-app)___Elev APmag S-brt delta deldot S-O-T /r S-T-O Sky_motion Sky_mot_PA RelVel-ANG Lun_Sky_Brt sky_SNR ***************************************************************************************************************************************************************************************************** $$SOE >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-16 19:00 Nm 19 48 24.05 -11 27 42.5 234.311575 19.705876 25. n.a. 0.04461789525154 -13.0604932 33.3450 /T 145.1697 0.7762854 277.25582 -88.16391 n.a. n.a. 2032-Dec-16 20:00 m 19 48 21.17 -11 27 35.9 245.656709 9.818307 25. n.a. 0.04430419237216 -13.0122112 33.2947 /T 145.2328 0.6458508 280.34434 -88.47736 3.197 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-17 19:00 Nm 19 47 37.89 -11 28 08.5 235.254335 18.969503 25. n.a. 0.03692650096795 -13.0286450 32.2029 /T 146.6124 1.0863955 274.47307 -87.86843 n.a. n.a. 2032-Dec-17 20:00 m 19 47 33.78 -11 28 02.6 246.481700 8.992016 25. n.a. 0.03661354512858 -12.9820724 32.1482 /T 146.6792 0.9284806 276.54131 -88.18700 2.828 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-18 19:00 N 19 46 20.09 -11 29 39.6 236.277076 18.127624 24. n.a. 0.02925010517760 -12.9995110 30.9415 /T 148.1584 1.6241800 272.15847 -87.47055 n.a. n.a. 2032-Dec-18 20:00 m 19 46 13.85 -11 29 34.9 247.379934 8.052704 24. n.a. 0.02893782891142 -12.9548366 30.8792 /T 148.2323 1.4300457 273.47660 -87.78873 2.447 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-19 19:00 N 19 43 59.51 -11 33 08.0 237.466432 17.083753 24. n.a. 0.02158705233837 -12.9720898 29.4438 /T 149.9249 2.7421105 270.10961 -86.84280 n.a. n.a. 2032-Dec-19 20:00 19 43 48.79 -11 33 06.2 248.430994 6.892691 24. n.a. 0.02127541124116 -12.9296008 29.3652 /T 150.0142 2.5030332 270.85866 -87.14980 n.a. n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-20 19:00 N 19 38 56.41 -11 41 14.0 239.097520 15.528298 24. n.a. 0.01393696321459 -12.9400242 27.3374 /T 152.2838 5.9420484 268.19473 -85.57636 n.a. n.a. 2032-Dec-20 20:00 19 38 32.61 -11 41 22.8 249.892779 5.161913 23. n.a. 0.01362606562326 -12.9000678 27.2117 /T 152.4196 5.7016794 268.52458 -85.83620 n.a. n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-21 19:00 N 19 21 27.19 -12 07 50.7 242.745194 11.640949 23. n.a. 0.00631171088280 -12.8332024 22.5063 /T 157.3509 25.773789 266.68522 -81.28829 n.a. n.a. 2032-Dec-21 20:00 19 19 38.89 -12 09 15.6 253.328367 0.728253 23. n.a. 0.00600343367045 -12.7894332 22.0864 /T 157.7802 27.253368 266.82003 -81.20937 n.a. n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2032-Dec-22 22:00 09 05 55.01 +08 33 25.9 79.015909 0.161638 12.668 n.a. 0.00251076277958 12.1533878 134.1552 /L 45.7412 149.61301 280.79498 69.512950 n.a. n.a. 2032-Dec-22 23:00 08 56 56.53 +08 57 50.1 89.849604 13.462940 12.848 n.a. 0.00280521184119 12.3176171 136.3826 /L 43.5060 122.37358 280.22968 71.381903 n.a. n.a. 2032-Dec-23 00:00 m 08 49 30.28 +09 16 53.7 101.081914 26.419122 13.016 n.a. 0.00310343275896 12.4690852 138.2240 /L 41.6570 102.14357 279.65532 72.917229 1.577 n.a. 2032-Dec-23 01:00 m 08 43 14.02 +09 31 59.2 114.155677 38.595371 13.175 n.a. 0.00340524415975 12.6168862 139.7732 /L 40.1001 86.526925 279.07938 74.235791 1.688 n.a. 2032-Dec-23 02:00 m 08 37 52.89 +09 44 02.6 131.155534 49.229593 13.325 n.a. 0.00371059949265 12.7636589 141.0932 /L 38.7725 74.033872 278.51467 75.416650 1.775 n.a. 2032-Dec-23 03:00 m 08 33 16.71 +09 53 44.0 154.698891 56.839517 13.468 n.a. 0.00401946428330 12.9080943 142.2273 /L 37.6308 63.722834 277.97719 76.511824 1.800 n.a. 2032-Dec-23 04:00 m 08 29 18.22 +10 01 33.2 184.452385 59.211987 13.603 n.a. 0.00433174191631 13.0465600 143.2065 /L 36.6441 54.993878 277.48489 77.553343 1.799 n.a. 2032-Dec-23 05:00 m 08 25 52.06 +10 07 53.6 212.824187 55.406549 13.732 n.a. 0.00464723237707 13.1742603 144.0538 /L 35.7890 47.464890 277.05723 78.558252 1.789 n.a. 2032-Dec-23 06:00 m 08 22 54.05 +10 13 03.8 234.106912 47.200097 13.856 n.a. 0.00496561532702 13.2861188 144.7874 /L 35.0477 40.894354 276.71551 79.532404 1.776 n.a. 2032-Dec-23 07:00 m 08 20 20.77 +10 17 19.2 249.492909 36.761901 13.975 n.a. 0.00528645195154 13.3774643 145.4222 /L 34.4050 35.131404 276.48349 80.473448 1.765 n.a. 2032-Dec-23 08:00 Nm 08 18 09.23 +10 20 52.5 261.520505 25.359393 14.088 n.a. 0.00560920130628 13.4445534 145.9711 /L 33.8481 30.082573 276.38783 81.373241 n.a. n.a. >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2032-Dec-23 21:00 08 05 31.68 +10 49 41.4 77.941508 2.443046 15.194 n.a. 0.00974632790961 12.8537482 149.4680 /L 30.2472 9.8178577 281.13337 84.857966 n.a. n.a. 2032-Dec-23 22:00 08 04 52.07 +10 51 30.0 87.644832 13.898078 15.256 n.a. 0.01005563475522 12.8591603 149.6655 /L 30.0424 9.9615104 280.25341 84.620787 n.a. n.a. 2032-Dec-23 23:00 08 04 11.85 +10 53 10.4 97.753263 25.431157 15.317 n.a. 0.01036536269714 12.8885658 149.8642 /L 29.8366 10.057527 279.30056 84.415705 n.a. n.a. 2032-Dec-24 00:00 08 03 31.30 +10 54 41.3 109.297235 36.660365 15.376 n.a. 0.01067606970507 12.9400789 150.0627 /L 29.6309 10.064750 278.32853 84.268071 n.a. n.a. $$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: A time-zone correction has been requested. See header. NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence symbol: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE (OBSERVING SITE) The solar-presence symbol is immediately followed by a lunar-presence symbol: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric ephemeris 'R.A._____(ICRF)_____DEC' = Astrometric right ascension and declination of the target center with respect to the observing site (coordinate origin) in the reference frame of the planetary ephemeris (ICRF). Compensated for down-leg light-time delay aberration. Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff} DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff} 'Azi____(a-app)___Elev' = Airless apparent azimuth and elevation of target center. Compensated for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth is measured clockwise from north: North(0) -> East(90) -> South(180) -> West(270) -> North (360) Elevation angle is with respect to a plane perpendicular to the reference surface local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES 'APmag S-brt' = The asteroids' approximate apparent airless visual magnitude and surface brightness using the standard IAU H-G system magnitude model: APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi_1 + G*phi_2) 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. For Earth-based observers, the estimated dimming due to atmospheric absorption (extinction) is available as a separate, requestable quantity. Surface brightness is the average airless visual magnitude of a square-arcsecond of the illuminated portion of the apparent disk. It is computed only if the target radius is known. Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND '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 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' 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 targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) 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 would be defined along the equator of a spherical coordinate system. Units: DEGREES 'S-T-O' = The Sun-Target-Observer angle; the interior vertex angle at target center formed by a vector from the target to the apparent center of the Sun (at reflection time on the target) and the apparent vector from target 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 'Sky_motion Sky_mot_PA RelVel-ANG' = Total apparent angular rate of the target in the plane-of-sky. "Sky_mot_PA" is the position angle of the target's direction of motion in the plane-of-sky, measured counter-clockwise from the apparent of-date north pole direction. "RelVel-ANG" is the flight path angle of the target's relative motion with respect to the observer's line-of-sight, in the range [-90,+90], where positive values indicate motion away from the observer, negative values are toward the observer: -90 = target is moving directly toward the observer 0 = target is moving at right angles to the observer's line-of-sight +90 = target is moving directly away from the observer UNITS: ARCSECONDS/MINUTE, DEGREES, DEGREES 'Lun_Sky_Brt sky_SNR' = Sky brightness due to moonlight scattered by Earth's atmosphere at the target's position in the sky. "sky_SNR" is the visual signal-to-noise ratio (SNR) of the target's surface brightness relative to background sky. Output only for topocentric Earth observers when both the Moon and target are above the local horizon and the Sun is in astronomical twilight (or further) below the horizon, and the target is not the Moon or Sun. If all conditions are not met, "n.a." is output. Galactic brightness, local sky light-pollution and weather are NOT considered. Lunar opposition surge is considered. The value returned is accurate under ideal conditions at the approximately 8-23% level, so is a useful but not definitive value. If the target-body radius is also known, "sky_SNR" is output. This is the approximate visual signal-to-noise ratio of the target's brightness divided by lunar sky brightness. When sky_SNR < 1, the target is dimmer than the ideal moonlight-scattering background sky, so unlikely to be detectable at visual wavelengths. In practice, visibility requires sky_SNR > 1 and a detector sensitive enough to reach the target's magnitude, even if it isn't washed out by moonlight. When relating magnitudes and brightness values, keep in mind their logarithmic relationship m2-m1 = -2.5*log_10(b2/b1). UNITS: VISUAL MAGNITUDES / ARCSECOND^2, and unitless ratio 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 *****************************************************************************************************************************************************************************************************