API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS (2024 YR4) 2025-Jun-22 11:45:21 Rec #:50652598 (+COV) Soln.date: 2025-Jun-03_07:47:32 # obs: 477 (2024-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2460705.5 ! 2025-Jan-30.00 (TDB) Residual RMS= .058675 EC= .6615999301423001 QR= .8515188266875525 TP= 2460636.9238411798 OM= 271.3674693540159 W= 134.3644983455991 IN= 3.408259321981154 A= 2.516308070047454 MA= 16.93290662173731 ADIST= 4.181097313407356 PER= 3.99166 N= .246921188 ANGMOM= .020461704 DAN= 2.63285 DDN= .96737 L= 45.7826715 B= 2.4358823 MOID= .00285384 TP= 2024-Nov-22.4238411798 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 23.92 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#78, OCC=3 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Sun Jun 22 11:45:22 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2024 YR4) {source: JPL#78} 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.250620.p250916 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-JUN-20. PREDICTS-> 2025-SEP-15 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= 2460705.5 ! 2025-Jan-30.00 (TDB) Residual RMS= .058675 EC= .6615999301423001 QR= .8515188266875525 TP= 2460636.9238411798 OM= 271.3674693540159 W= 134.3644983455991 IN= 3.408259321981154 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-7.817185871179870E-01 Y= 9.591166659204480E-01 Z= 3.666886038072873E-01 VX=-1.831413040000361E-02 VY=-1.487883867213291E-03 VZ=-1.836791648737177E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 23.92 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 43 25.28 -11 33 34.5 235.244826 18.855665 25. n.a. 0.04358536633936 -13.0192437 32.2018 /T 146.3920 1.3496952 271.90086 -86.87368 n.a. n.a. 2032-Dec-16 20:00 m 19 43 20.03 -11 33 31.1 246.463982 8.875831 25. n.a. 0.04327263919722 -12.9724758 32.1426 /T 146.4640 1.2188665 272.91313 -87.18634 3.222 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-17 19:00 Nm 19 41 29.90 -11 35 38.4 236.383199 17.907724 25. n.a. 0.03591641555497 -12.9818816 30.8000 /T 148.0932 1.9375513 270.24281 -86.29254 n.a. n.a. 2032-Dec-17 20:00 m 19 41 22.29 -11 35 37.0 247.463279 7.819464 25. n.a. 0.03560456481616 -12.9371232 30.7322 /T 148.1730 1.7845182 270.89637 -86.60255 2.853 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-18 19:00 N 19 38 24.73 -11 39 36.1 237.707019 16.737088 25. n.a. 0.02826612170073 -12.9428486 29.1387 /T 150.0379 3.0115798 268.89792 -85.45438 n.a. n.a. 2032-Dec-18 20:00 m 19 38 12.77 -11 39 38.3 248.632285 6.521896 25. n.a. 0.02795518471093 -12.9003613 29.0554 /T 150.1326 2.8349774 269.29197 -85.75294 2.471 n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-19 19:00 N 19 32 55.00 -11 47 07.5 239.420593 15.112607 24. n.a. 0.02063670420632 -12.8937382 26.9455 /T 152.4982 5.3840268 267.82732 -84.05323 n.a. n.a. 2032-Dec-19 20:00 19 32 33.36 -11 47 17.9 250.161736 4.726866 24. n.a. 0.02032692136470 -12.8537480 26.8277 /T 152.6268 5.2048846 268.03938 -84.31800 n.a. n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-20 19:00 N 19 20 51.66 -12 03 06.7 242.193219 12.261137 24. n.a. 0.01304088256333 -12.7940979 23.3394 /T 156.3547 12.749412 267.16086 -81.07248 n.a. n.a. 2032-Dec-20 20:00 19 19 59.44 -12 03 41.5 252.695609 1.567618 24. n.a. 0.01273348884547 -12.7551486 23.1160 /T 156.5880 12.802030 267.27193 -81.21789 n.a. n.a. >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2032-Dec-21 19:00 N 18 35 41.17 -12 46 37.7 250.169869 3.206647 26. n.a. 0.00557738473377 -12.1808533 13.6859 /T 166.2357 65.590652 268.29433 -70.04686 n.a. n.a. >..... Elevation Cut-off Requested .....< 2032-Dec-22 07:00 m 16 28 36.21 -12 13 07.7 110.148948 4.218599 20. n.a. 0.00230381580359 -8.8847657 24.7849 /L 155.1596 368.65433 273.89097 -40.87072 1.602 n.a. 2032-Dec-22 08:00 Nm 16 01 01.56 -11 39 13.8 125.786549 19.309208 19. n.a. 0.00210493016883 -7.5793157 31.0400 /L 148.8976 444.98066 275.33945 -33.79591 n.a. n.a. >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2032-Dec-22 23:00 09 36 46.70 +07 19 58.5 84.700538 4.859068 13.872 n.a. 0.00404448014969 11.4568367 126.7241 /L 53.0886 123.06121 281.22561 62.293849 n.a. n.a. 2032-Dec-23 00:00 m 09 29 07.04 +07 41 55.5 95.503441 17.945746 13.962 n.a. 0.00432266440929 11.6647751 128.6507 /L 51.1543 109.38682 280.79221 63.894787 1.883 n.a. 2032-Dec-23 01:00 m 09 22 16.37 +08 00 42.3 107.333219 30.600565 14.052 n.a. 0.00460579792879 11.8687825 130.3688 /L 49.4285 97.761877 280.35147 65.363977 1.960 n.a. 2032-Dec-23 02:00 m 09 16 07.89 +08 16 48.9 121.803864 42.233837 14.141 n.a. 0.00489381374397 12.0705400 131.9080 /L 47.8816 87.674348 279.91616 66.747283 2.026 n.a. 2032-Dec-23 03:00 m 09 10 36.47 +08 30 39.6 141.235288 51.787131 14.229 n.a. 0.00518664526674 12.2685734 133.2907 /L 46.4913 78.757870 279.49998 68.076031 2.034 n.a. 2032-Dec-23 04:00 m 09 05 38.19 +08 42 34.7 167.522204 57.383015 14.316 n.a. 0.00548416258726 12.4592524 134.5341 /L 45.2402 70.758486 279.11692 69.368952 2.018 n.a. 2032-Dec-23 05:00 m 09 01 09.92 +08 52 51.7 197.249771 57.041270 14.401 n.a. 0.00578613165316 12.6376941 135.6523 /L 44.1143 63.507457 278.78085 70.634237 1.993 n.a. 2032-Dec-23 06:00 m 08 57 09.03 +09 01 45.7 222.470798 51.060968 14.486 n.a. 0.00609219404903 12.7985706 136.6570 /L 43.1017 56.898975 278.50537 71.871637 1.966 n.a. 2032-Dec-23 07:00 m 08 53 33.21 +09 09 30.2 240.892436 41.651963 14.569 n.a. 0.00640186492775 12.9368078 137.5588 /L 42.1919 50.871902 278.30349 73.074459 1.940 n.a. 2032-Dec-23 08:00 Nm 08 50 20.29 +09 16 16.9 254.676028 30.605646 14.650 n.a. 0.00671454629126 13.0481597 138.3673 /L 41.3753 45.394910 278.18731 74.231410 n.a. n.a. >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2032-Dec-23 22:00 08 27 04.34 +10 11 34.8 84.624126 9.264666 15.573 n.a. 0.01108430024536 12.6853624 144.5087 /L 35.1210 16.653347 279.73247 80.023806 n.a. n.a. 2032-Dec-23 23:00 08 25 58.03 +10 14 15.8 94.574380 20.903233 15.624 n.a. 0.01138982894427 12.7136228 144.8135 /L 34.8089 16.412348 279.22536 79.921751 n.a. n.a. 2032-Dec-24 00:00 08 24 52.65 +10 16 45.2 105.565680 32.360522 15.673 n.a. 0.01169631822072 12.7648281 145.1133 /L 34.5019 16.128837 278.67329 79.871197 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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *****************************************************************************************************************************************************************************************************