******************************************************************************* JPL/HORIZONS Lovejoy (C/2011 W3) 2024-Apr-27 11:17:08 Rec #:90004115 (+COV) Soln.date: 2012-Jun-04_12:31:54 # obs: 123 (2011-2012) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2455901.5 ! 2011-Dec-06.0000000 (TDB) RMSW= n.a. EC= .9999294152687144 QR= .005553814151232848 TP= 2455911.5118089998 OM= 326.3691470244605 W= 53.50921241435645 IN= 134.3558107377023 A= 78.68293963971914 MA= 359.9858617465074 ADIST= 157.360325465287 PER= 697.95764373996 N= .001412158 ANGMOM= .001812944 DAN= .00697 DDN= .0274 L= 282.985468 B= 35.08813 MOID= .490179 TP= 2011-Dec-16.0118089998 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 15.3 M2= 20.6 k1= 9.3 k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#58, data arc: 2011-11-27 to 2012-01-06 2: k1=9.3, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat Apr 27 11:17:09 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lovejoy (C/2011 W3) {source: JPL#58} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2012-Jan-07 18:50:00.0000 UT Stop time : A.D. 2012-Jan-07 19:10:00.0000 UT Step-size : 90 steps ******************************************************************************* Target pole/equ : undefined Target radii : undefined 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.240426.p240720 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-26. PREDICTS-> 2024-JUL-19 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= 2455901.5 ! 2011-Dec-06.0000000 (TDB) RMSW= n.a. EC= .9999294152687144 QR= .005553814151232848 TP= 2455911.5118089998 OM= 326.3691470244605 W= 53.50921241435645 IN= 134.3558107377023 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 3.777408211027497E-03 Y= 4.827201187256207E-01 Z=-1.490745024244305E-01 VX= 3.040833769315030E-03 VY=-3.291068817977454E-02 VZ= 8.676278963108908E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 15.3 M2= 20.6 k1= 9.3 k2= 5. PHCOF= .030 **************************************************************************************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot delta deldot VmagSn VmagOb S-O-T /r RNG_3sigma RNGRT_3sig **************************************************************************************************************************************************** $$SOE 2012-Jan-07 18:50:00.000 0.877335064994 44.7017293 0.49899634661535 -0.0137314 44.8446877 53.7643574 62.9564 /L 6325.0722 0.0016088 2012-Jan-07 18:50:13.333 0.877339049158 44.7016278 0.49899634541261 -0.0132581 44.8445853 53.7643337 62.9569 /L 6325.0716 0.0016088 2012-Jan-07 18:50:26.667 0.877343033312 44.7015264 0.49899634425204 -0.0127849 44.8444829 53.7643099 62.9573 /L 6325.0710 0.0016088 2012-Jan-07 18:50:40.000 0.877347017458 44.7014250 0.49899634313366 -0.0123117 44.8443805 53.7642862 62.9578 /L 6325.0704 0.0016087 2012-Jan-07 18:50:53.333 0.877351001594 44.7013236 0.49899634205745 -0.0118384 44.8442781 53.7642624 62.9582 /L 6325.0698 0.0016087 2012-Jan-07 18:51:06.667 0.877354985722 44.7012222 0.49899634102342 -0.0113652 44.8441757 53.7642387 62.9587 /L 6325.0692 0.0016087 2012-Jan-07 18:51:20.000 0.877358969840 44.7011207 0.49899634003157 -0.0108920 44.8440734 53.7642149 62.9592 /L 6325.0686 0.0016087 2012-Jan-07 18:51:33.333 0.877362953949 44.7010193 0.49899633908189 -0.0104187 44.8439710 53.7641912 62.9596 /L 6325.0681 0.0016087 2012-Jan-07 18:51:46.667 0.877366938050 44.7009179 0.49899633817439 -0.0099455 44.8438686 53.7641674 62.9601 /L 6325.0675 0.0016087 2012-Jan-07 18:52:00.000 0.877370922141 44.7008165 0.49899633730907 -0.0094723 44.8437662 53.7641437 62.9605 /L 6325.0669 0.0016087 2012-Jan-07 18:52:13.333 0.877374906223 44.7007151 0.49899633648593 -0.0089991 44.8436638 53.7641199 62.9610 /L 6325.0663 0.0016087 2012-Jan-07 18:52:26.667 0.877378890296 44.7006137 0.49899633570496 -0.0085258 44.8435614 53.7640962 62.9614 /L 6325.0657 0.0016087 2012-Jan-07 18:52:40.000 0.877382874360 44.7005123 0.49899633496617 -0.0080526 44.8434590 53.7640724 62.9619 /L 6325.0651 0.0016086 2012-Jan-07 18:52:53.333 0.877386858415 44.7004108 0.49899633426956 -0.0075794 44.8433566 53.7640487 62.9624 /L 6325.0645 0.0016086 2012-Jan-07 18:53:06.667 0.877390842461 44.7003094 0.49899633361512 -0.0071061 44.8432543 53.7640250 62.9628 /L 6325.0639 0.0016086 2012-Jan-07 18:53:20.000 0.877394826498 44.7002080 0.49899633300287 -0.0066329 44.8431519 53.7640012 62.9633 /L 6325.0633 0.0016086 2012-Jan-07 18:53:33.333 0.877398810526 44.7001066 0.49899633243279 -0.0061597 44.8430495 53.7639775 62.9637 /L 6325.0626 0.0016086 2012-Jan-07 18:53:46.667 0.877402794545 44.7000052 0.49899633190488 -0.0056865 44.8429471 53.7639537 62.9642 /L 6325.0620 0.0016086 2012-Jan-07 18:54:00.000 0.877406778555 44.6999038 0.49899633141916 -0.0052132 44.8428447 53.7639300 62.9647 /L 6325.0614 0.0016086 2012-Jan-07 18:54:13.333 0.877410762556 44.6998024 0.49899633097561 -0.0047400 44.8427423 53.7639063 62.9651 /L 6325.0608 0.0016086 2012-Jan-07 18:54:26.667 0.877414746547 44.6997010 0.49899633057423 -0.0042668 44.8426400 53.7638825 62.9656 /L 6325.0602 0.0016085 2012-Jan-07 18:54:40.000 0.877418730530 44.6995996 0.49899633021504 -0.0037936 44.8425376 53.7638588 62.9660 /L 6325.0596 0.0016085 2012-Jan-07 18:54:53.333 0.877422714504 44.6994982 0.49899632989802 -0.0033203 44.8424352 53.7638350 62.9665 /L 6325.0590 0.0016085 2012-Jan-07 18:55:06.667 0.877426698468 44.6993968 0.49899632962317 -0.0028471 44.8423328 53.7638113 62.9669 /L 6325.0584 0.0016085 2012-Jan-07 18:55:20.000 0.877430682424 44.6992954 0.49899632939051 -0.0023739 44.8422305 53.7637876 62.9674 /L 6325.0578 0.0016085 2012-Jan-07 18:55:33.333 0.877434666370 44.6991940 0.49899632920002 -0.0019007 44.8421281 53.7637638 62.9679 /L 6325.0572 0.0016085 2012-Jan-07 18:55:46.667 0.877438650308 44.6990926 0.49899632905171 -0.0014275 44.8420257 53.7637401 62.9683 /L 6325.0566 0.0016085 2012-Jan-07 18:56:00.000 0.877442634236 44.6989912 0.49899632894557 -0.0009542 44.8419233 53.7637164 62.9688 /L 6325.0560 0.0016085 2012-Jan-07 18:56:13.333 0.877446618156 44.6988898 0.49899632888161 -0.0004810 44.8418210 53.7636926 62.9692 /L 6325.0553 0.0016085 2012-Jan-07 18:56:26.667 0.877450602066 44.6987884 0.49899632885982 -0.0000078 44.8417186 53.7636689 62.9697 /L 6325.0547 0.0016084 2012-Jan-07 18:56:40.000 0.877454585967 44.6986870 0.49899632888022 0.0004654 44.8416162 53.7636452 62.9701 /L 6325.0541 0.0016084 2012-Jan-07 18:56:53.333 0.877458569860 44.6985856 0.49899632894278 0.0009386 44.8415139 53.7636214 62.9706 /L 6325.0535 0.0016084 2012-Jan-07 18:57:06.667 0.877462553743 44.6984842 0.49899632904753 0.0014118 44.8414115 53.7635977 62.9711 /L 6325.0529 0.0016084 2012-Jan-07 18:57:20.000 0.877466537617 44.6983828 0.49899632919445 0.0018851 44.8413091 53.7635740 62.9715 /L 6325.0523 0.0016084 2012-Jan-07 18:57:33.333 0.877470521482 44.6982814 0.49899632938354 0.0023583 44.8412068 53.7635503 62.9720 /L 6325.0516 0.0016084 2012-Jan-07 18:57:46.667 0.877474505338 44.6981800 0.49899632961482 0.0028315 44.8411044 53.7635265 62.9724 /L 6325.0510 0.0016084 2012-Jan-07 18:58:00.000 0.877478489185 44.6980786 0.49899632988827 0.0033047 44.8410020 53.7635028 62.9729 /L 6325.0504 0.0016084 2012-Jan-07 18:58:13.333 0.877482473023 44.6979772 0.49899633020389 0.0037779 44.8408997 53.7634791 62.9734 /L 6325.0498 0.0016083 2012-Jan-07 18:58:26.667 0.877486456852 44.6978758 0.49899633056169 0.0042511 44.8407973 53.7634553 62.9738 /L 6325.0492 0.0016083 2012-Jan-07 18:58:40.000 0.877490440672 44.6977745 0.49899633096167 0.0047243 44.8406950 53.7634316 62.9743 /L 6325.0485 0.0016083 2012-Jan-07 18:58:53.333 0.877494424483 44.6976731 0.49899633140382 0.0051975 44.8405926 53.7634079 62.9747 /L 6325.0479 0.0016083 2012-Jan-07 18:59:06.667 0.877498408285 44.6975717 0.49899633188814 0.0056708 44.8404902 53.7633842 62.9752 /L 6325.0473 0.0016083 2012-Jan-07 18:59:20.000 0.877502392077 44.6974703 0.49899633241465 0.0061440 44.8403879 53.7633604 62.9756 /L 6325.0467 0.0016083 2012-Jan-07 18:59:33.333 0.877506375861 44.6973689 0.49899633298333 0.0066172 44.8402855 53.7633367 62.9761 /L 6325.0460 0.0016083 2012-Jan-07 18:59:46.667 0.877510359636 44.6972675 0.49899633359418 0.0070904 44.8401832 53.7633130 62.9766 /L 6325.0454 0.0016083 2012-Jan-07 19:00:00.000 0.877514343402 44.6971661 0.49899633424721 0.0075636 44.8400808 53.7632893 62.9770 /L 6325.0448 0.0016083 2012-Jan-07 19:00:13.333 0.877518327158 44.6970648 0.49899633494241 0.0080368 44.8399785 53.7632656 62.9775 /L 6325.0442 0.0016082 2012-Jan-07 19:00:26.667 0.877522310906 44.6969634 0.49899633567979 0.0085100 44.8398761 53.7632418 62.9779 /L 6325.0435 0.0016082 2012-Jan-07 19:00:40.000 0.877526294644 44.6968620 0.49899633645935 0.0089832 44.8397737 53.7632181 62.9784 /L 6325.0429 0.0016082 2012-Jan-07 19:00:53.333 0.877530278374 44.6967606 0.49899633728108 0.0094564 44.8396714 53.7631944 62.9788 /L 6325.0423 0.0016082 2012-Jan-07 19:01:06.667 0.877534262094 44.6966592 0.49899633814498 0.0099296 44.8395690 53.7631707 62.9793 /L 6325.0417 0.0016082 2012-Jan-07 19:01:20.000 0.877538245806 44.6965579 0.49899633905107 0.0104028 44.8394667 53.7631470 62.9798 /L 6325.0410 0.0016082 2012-Jan-07 19:01:33.333 0.877542229508 44.6964565 0.49899633999932 0.0108760 44.8393643 53.7631232 62.9802 /L 6325.0404 0.0016082 2012-Jan-07 19:01:46.667 0.877546213201 44.6963551 0.49899634098975 0.0113492 44.8392620 53.7630995 62.9807 /L 6325.0398 0.0016082 2012-Jan-07 19:02:00.000 0.877550196885 44.6962537 0.49899634202236 0.0118224 44.8391597 53.7630758 62.9811 /L 6325.0391 0.0016081 2012-Jan-07 19:02:13.333 0.877554180561 44.6961524 0.49899634309714 0.0122956 44.8390573 53.7630521 62.9816 /L 6325.0385 0.0016081 2012-Jan-07 19:02:26.667 0.877558164227 44.6960510 0.49899634421409 0.0127688 44.8389550 53.7630284 62.9821 /L 6325.0379 0.0016081 2012-Jan-07 19:02:40.000 0.877562147884 44.6959496 0.49899634537322 0.0132420 44.8388526 53.7630047 62.9825 /L 6325.0372 0.0016081 2012-Jan-07 19:02:53.333 0.877566131532 44.6958482 0.49899634657453 0.0137152 44.8387503 53.7629809 62.9830 /L 6325.0366 0.0016081 2012-Jan-07 19:03:06.667 0.877570115171 44.6957469 0.49899634781801 0.0141884 44.8386479 53.7629572 62.9834 /L 6325.0359 0.0016081 2012-Jan-07 19:03:20.000 0.877574098801 44.6956455 0.49899634910366 0.0146616 44.8385456 53.7629335 62.9839 /L 6325.0353 0.0016081 2012-Jan-07 19:03:33.333 0.877578082422 44.6955441 0.49899635043149 0.0151348 44.8384433 53.7629098 62.9843 /L 6325.0347 0.0016081 2012-Jan-07 19:03:46.667 0.877582066034 44.6954428 0.49899635180149 0.0156080 44.8383409 53.7628861 62.9848 /L 6325.0340 0.0016081 2012-Jan-07 19:04:00.000 0.877586049637 44.6953414 0.49899635321367 0.0160812 44.8382386 53.7628624 62.9853 /L 6325.0334 0.0016080 2012-Jan-07 19:04:13.333 0.877590033231 44.6952400 0.49899635466802 0.0165544 44.8381362 53.7628387 62.9857 /L 6325.0327 0.0016080 2012-Jan-07 19:04:26.667 0.877594016816 44.6951387 0.49899635616455 0.0170276 44.8380339 53.7628150 62.9862 /L 6325.0321 0.0016080 2012-Jan-07 19:04:40.000 0.877598000392 44.6950373 0.49899635770325 0.0175008 44.8379316 53.7627913 62.9866 /L 6325.0315 0.0016080 2012-Jan-07 19:04:53.333 0.877601983958 44.6949359 0.49899635928413 0.0179740 44.8378292 53.7627675 62.9871 /L 6325.0308 0.0016080 2012-Jan-07 19:05:06.667 0.877605967516 44.6948346 0.49899636090717 0.0184472 44.8377269 53.7627438 62.9875 /L 6325.0302 0.0016080 2012-Jan-07 19:05:20.000 0.877609951065 44.6947332 0.49899636257240 0.0189204 44.8376246 53.7627201 62.9880 /L 6325.0295 0.0016080 2012-Jan-07 19:05:33.333 0.877613934604 44.6946319 0.49899636427980 0.0193936 44.8375222 53.7626964 62.9885 /L 6325.0289 0.0016080 2012-Jan-07 19:05:46.667 0.877617918135 44.6945305 0.49899636602937 0.0198668 44.8374199 53.7626727 62.9889 /L 6325.0282 0.0016079 2012-Jan-07 19:06:00.000 0.877621901656 44.6944291 0.49899636782111 0.0203400 44.8373176 53.7626490 62.9894 /L 6325.0276 0.0016079 2012-Jan-07 19:06:13.333 0.877625885169 44.6943278 0.49899636965503 0.0208132 44.8372152 53.7626253 62.9898 /L 6325.0269 0.0016079 2012-Jan-07 19:06:26.667 0.877629868672 44.6942264 0.49899637153112 0.0212864 44.8371129 53.7626016 62.9903 /L 6325.0263 0.0016079 2012-Jan-07 19:06:40.000 0.877633852167 44.6941251 0.49899637344939 0.0217595 44.8370106 53.7625779 62.9908 /L 6325.0256 0.0016079 2012-Jan-07 19:06:53.333 0.877637835652 44.6940237 0.49899637540983 0.0222327 44.8369083 53.7625542 62.9912 /L 6325.0250 0.0016079 2012-Jan-07 19:07:06.667 0.877641819128 44.6939224 0.49899637741244 0.0227059 44.8368059 53.7625305 62.9917 /L 6325.0243 0.0016079 2012-Jan-07 19:07:20.000 0.877645802596 44.6938210 0.49899637945723 0.0231791 44.8367036 53.7625068 62.9921 /L 6325.0237 0.0016079 2012-Jan-07 19:07:33.333 0.877649786054 44.6937197 0.49899638154419 0.0236523 44.8366013 53.7624831 62.9926 /L 6325.0230 0.0016079 2012-Jan-07 19:07:46.667 0.877653769503 44.6936183 0.49899638367333 0.0241255 44.8364990 53.7624594 62.9930 /L 6325.0224 0.0016078 2012-Jan-07 19:08:00.000 0.877657752943 44.6935170 0.49899638584464 0.0245987 44.8363966 53.7624357 62.9935 /L 6325.0217 0.0016078 2012-Jan-07 19:08:13.333 0.877661736375 44.6934156 0.49899638805812 0.0250719 44.8362943 53.7624120 62.9940 /L 6325.0210 0.0016078 2012-Jan-07 19:08:26.667 0.877665719797 44.6933143 0.49899639031377 0.0255450 44.8361920 53.7623883 62.9944 /L 6325.0204 0.0016078 2012-Jan-07 19:08:40.000 0.877669703210 44.6932129 0.49899639261160 0.0260182 44.8360897 53.7623646 62.9949 /L 6325.0197 0.0016078 2012-Jan-07 19:08:53.333 0.877673686614 44.6931116 0.49899639495160 0.0264914 44.8359874 53.7623409 62.9953 /L 6325.0191 0.0016078 2012-Jan-07 19:09:06.667 0.877677670009 44.6930102 0.49899639733378 0.0269646 44.8358850 53.7623172 62.9958 /L 6325.0184 0.0016078 2012-Jan-07 19:09:20.000 0.877681653395 44.6929089 0.49899639975813 0.0274378 44.8357827 53.7622935 62.9963 /L 6325.0178 0.0016078 2012-Jan-07 19:09:33.333 0.877685636772 44.6928075 0.49899640222465 0.0279110 44.8356804 53.7622698 62.9967 /L 6325.0171 0.0016077 2012-Jan-07 19:09:46.667 0.877689620139 44.6927062 0.49899640473334 0.0283841 44.8355781 53.7622461 62.9972 /L 6325.0164 0.0016077 2012-Jan-07 19:10:00.000 0.877693603499 44.6926049 0.49899640728421 0.0288573 44.8354758 53.7622224 62.9976 /L 6325.0158 0.0016077 $$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. 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S '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 '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 '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 = '2011 W3' START_TIME = '2012-Jan-07 18:50' STOP_TIME = '2012-Jan-07 19:10' STEP_SIZE = '90' QUANTITIES = '19,20,22,23,39'