******************************************************************************* JPL/HORIZONS (2021 PH27) 2025-Dec-12 18:05:07 Rec #:50466659 (+COV) Soln.date: 2025-May-05_06:20:13 # obs: 114 (2017-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459538.5 ! 2021-Nov-20.00 (TDB) Residual RMS= .11977 EC= .7116865881470597 QR= .1331230217593334 TP= 2459495.3398547922 OM= 39.40883092693475 W= 8.573375079594227 IN= 31.9269462106683 A= .4617302431537084 MA= 135.5827656919476 ADIST= .7903374645480833 PER= .31376 N= 3.14138808 ANGMOM= .008211456000000001 DAN= .13374 DDN= .76912 L= 46.7004289 B= 4.5217145 MOID= .223773 TP= 2021-Oct-07.8398547922 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 17.67 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. ASTEROID comments: 1: soln ref.= JPL#20, OCC=2 2: source=ORB ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 18:05:07 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2021 PH27) {source: JPL#20} Center body name: Sun (10) {source: DE441} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2021-Oct-07 00:00:00.0000 UT Stop time : A.D. 2021-Oct-08 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -695700.0 {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 : IAU_SUN {East-longitude positive} Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : None 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.251212.p260310 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-DEC-12. PREDICTS-> 2026-MAR-09 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 n.a. , 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= 2459538.5 ! 2021-Nov-20.00 (TDB) Residual RMS= .11977 EC= .7116865881470597 QR= .1331230217593334 TP= 2459495.3398547922 OM= 39.40883092693475 W= 8.573375079594227 IN= 31.9269462106683 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-6.008101361858013E-01 Y=-4.277409661139049E-01 Z=-1.672423332855800E-01 VX= 1.618685478310280E-03 VY=-7.268797420601009E-03 VZ=-9.287166540511880E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= n.a. ROTPER= n.a. H= 17.67 G= .150 B-V= n.a. ALBEDO= n.a. STYP= n.a. *************************************************************************************************** Date__(UT)__HR:MN delta deldot VmagSn VmagOb RNG_3sigma RNGRT_3sig *************************************************************************************************** $$SOE 2021-Oct-07 00:00 0.13722082098343 -16.5232390 104.9219381 104.9219382 118.9442 0.0034178 2021-Oct-07 01:00 0.13683222726882 -15.7694094 105.0967799 105.0967799 111.8837 0.0034327 2021-Oct-07 02:00 0.13646189064259 -15.0061089 105.2640614 105.2640614 105.0112 0.0034468 2021-Oct-07 03:00 0.13611003485146 -14.2336814 105.4235905 105.4235905 98.3901 0.0034600 2021-Oct-07 04:00 0.13577687510522 -13.4524921 105.5751812 105.5751812 92.0994 0.0034723 2021-Oct-07 05:00 0.13546261757091 -12.6629270 105.7186539 105.7186539 86.2359 0.0034837 2021-Oct-07 06:00 0.13516745887810 -11.8653923 105.8538364 105.8538365 80.9168 0.0034942 2021-Oct-07 07:00 0.13489158563787 -11.0603140 105.9805642 105.9805643 76.2797 0.0035036 2021-Oct-07 08:00 0.13463517397765 -10.2481369 106.0986811 106.0986812 72.4780 0.0035121 2021-Oct-07 09:00 0.13439838909490 -9.4293241 106.2080399 106.2080399 69.6691 0.0035196 2021-Oct-07 10:00 0.13418138483162 -8.6043559 106.3085026 106.3085026 67.9945 0.0035260 2021-Oct-07 11:00 0.13398430327231 -7.7737287 106.3999414 106.3999415 67.5536 0.0035314 2021-Oct-07 12:00 0.13380727436771 -6.9379542 106.4822390 106.4822390 68.3821 0.0035357 2021-Oct-07 13:00 0.13365041558638 -6.0975576 106.5552887 106.5552887 70.4438 0.0035390 2021-Oct-07 14:00 0.13351383159623 -5.2530770 106.6189953 106.6189953 73.6399 0.0035411 2021-Oct-07 15:00 0.13339761397810 -4.4050616 106.6732750 106.6732751 77.8323 0.0035422 2021-Oct-07 16:00 0.13330184097288 -3.5540706 106.7180564 106.7180565 82.8688 0.0035421 2021-Oct-07 17:00 0.13322657726392 -2.7006712 106.7532801 106.7532801 88.6015 0.0035410 2021-Oct-07 18:00 0.13317187379603 -1.8454374 106.7788992 106.7788992 94.8982 0.0035387 2021-Oct-07 19:00 0.13313776763226 -0.9889487 106.7948795 106.7948796 101.6460 0.0035353 2021-Oct-07 20:00 0.13312428184933 -0.1317878 106.8011998 106.8011999 108.7512 0.0035308 2021-Oct-07 21:00 0.13313142547235 0.7254606 106.7978517 106.7978517 116.1371 0.0035252 2021-Oct-07 22:00 0.13315919344937 1.5822115 106.7848397 106.7848397 123.7412 0.0035184 2021-Oct-07 23:00 0.13320756666578 2.4378815 106.7621814 106.7621814 131.5123 0.0035106 2021-Oct-08 00:00 0.13327651199861 3.2918900 106.7299071 106.7299071 139.4087 0.0035017 $$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 'VmagSn VmagOb' = Magnitude of target centers' velocity with respect to the Sun ("VmagSn") and the observer ("VmagOb") at the time light left the target center to be observed (print time minus down-leg light-time). These are absolute values of the velocity vectors (total speeds) and do NOT indicate direction of motion. Units: 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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *************************************************************************************************** !$$SOF CENTER = '@Sun' COMMAND = '2021 PH27' QUANTITIES = '20,22,39' START_TIME = '2021-10-07' STEP_SIZE = '1 hour' STOP_TIME = '2021-10-08'