******************************************************************************* JPL/HORIZONS Great March comet (C/1843 D1) 2024-May-04 17:55:24 Rec #:90001641 Soln.date: - # obs: 200 (45 days) IAU76/J2000 helio. eclip. TWO-BODY elements (au, days, deg., period=Julian yrs) EPOCH= 2394259.411 ! 1843-Feb-27.9110000 (TDB) RMSW= n.a. EC= .999914 QR= .005527 TP= 2394259.4109999998 OM= 3.5272 W= 82.639 IN= 144.3548 A= 64.26744186044232 MA= 0. ADIST= 128.5293567208846 PER= 515.22238334572 N= .001913011 ANGMOM= .001808555 DAN= .0098 DDN= .01268 L= 282.5599014 B= 35.3072887 TP= 1843-Feb-27.9109999999 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= SAO_2008, data arc: 1843-03-05 to 1843-04-19 2: ; TWO_BODY;time units are UT, but set to ET; n_obs is approximate; original epoc ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 4 17:55:24 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Great March comet (C/1843 D1) {source: SAO_200820} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1843-Feb-27 21:30:00.0000 UT Stop time : A.D. 1843-Feb-27 22:30:00.0000 UT Step-size : 120 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.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 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 TWO-BODY elements (au, days, deg.): EPOCH= 2394259.411 ! 1843-Feb-27.9110000 (TDB) RMSW= n.a. EC= .999914 QR= .005527 TP= 2394259.4109999998 OM= 3.5272 W= 82.639 IN= 144.3548 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 9.808294744457927E-04 Y=-5.309824444084246E-03 Z= 1.179604558766959E-03 VX=-3.218143834029238E-01 VY=-5.923495762139568E-02 VZ= 9.476043770445358E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. k2= n.a. PHCOF= n.a. ***************************************************************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot delta deldot VmagSn VmagOb S-O-T /r ***************************************************************************************************************************** $$SOE 1843-Feb-27 21:30:00.000 0.007252485967 -241.244509 0.99805506290924 -273.875412 494.5992668 472.0364411 0.1013 /L 1843-Feb-27 21:30:30.000 0.007204242898 -239.440881 0.99799976191130 -277.151037 496.2526033 473.7574043 0.1026 /L 1843-Feb-27 21:31:00.000 0.007156367288 -237.577654 0.99794379877995 -280.466767 497.9098466 475.4840622 0.1041 /L 1843-Feb-27 21:31:30.000 0.007108871247 -235.653384 0.99788716545452 -283.822479 499.5704657 477.2159275 0.1057 /L 1843-Feb-27 21:32:00.000 0.007061767174 -233.666614 0.99782985390420 -287.217992 501.2338991 478.9524828 0.1075 /L 1843-Feb-27 21:32:30.000 0.007015067766 -231.615884 0.99777185613924 -290.653071 502.8995532 480.6931792 0.1095 /L 1843-Feb-27 21:33:00.000 0.006968786011 -229.499728 0.99771316422293 -294.127418 504.5668019 482.4374357 0.1117 /L 1843-Feb-27 21:33:30.000 0.006922935194 -227.316681 0.99765377028423 -297.640671 506.2349852 484.1846381 0.1140 /L 1843-Feb-27 21:34:00.000 0.006877528892 -225.065281 0.99759366653110 -301.192400 507.9034085 485.9341379 0.1164 /L 1843-Feb-27 21:34:30.000 0.006832580978 -222.744070 0.99753284526273 -304.782101 509.5713418 487.6852514 0.1190 /L 1843-Feb-27 21:35:00.000 0.006788105618 -220.351603 0.99747129889222 -308.409196 511.2380186 489.4372588 0.1216 /L 1843-Feb-27 21:35:30.000 0.006744117265 -217.886446 0.99740901995061 -312.073026 512.9026355 491.1894034 0.1244 /L 1843-Feb-27 21:36:00.000 0.006700630662 -215.347186 0.99734600111113 -315.772847 514.5643511 492.9408908 0.1273 /L 1843-Feb-27 21:36:30.000 0.006657660830 -212.732432 0.99728223520451 -319.507830 516.2222856 494.6908882 0.1303 /L 1843-Feb-27 21:37:00.000 0.006615223071 -210.040821 0.99721771523709 -323.277051 517.8755201 496.4385236 0.1333 /L 1843-Feb-27 21:37:30.000 0.006573332957 -207.271026 0.99715243440967 -327.079492 519.5230963 498.1828853 0.1364 /L 1843-Feb-27 21:38:00.000 0.006532006324 -204.421756 0.99708638613717 -330.914035 521.1640160 499.9230216 0.1396 /L 1843-Feb-27 21:38:30.000 0.006491259262 -201.491767 0.99701956406902 -334.779458 522.7972411 501.6579402 0.1429 /L 1843-Feb-27 21:39:00.000 0.006451108108 -198.479865 0.99695196210819 -338.674434 524.4216932 503.3866082 0.1462 /L 1843-Feb-27 21:39:30.000 0.006411569435 -195.384918 0.99688357444173 -342.597522 526.0362537 505.1079519 0.1496 /L 1843-Feb-27 21:40:00.000 0.006372660037 -192.205853 0.99681439555038 -346.547171 527.6397645 506.8208567 0.1530 /L 1843-Feb-27 21:40:30.000 0.006334396916 -188.941675 0.99674442024045 -350.521711 529.2310275 508.5241678 0.1564 /L 1843-Feb-27 21:41:00.000 0.006296797269 -185.591463 0.99667364366545 -354.519351 530.8088062 510.2166901 0.1599 /L 1843-Feb-27 21:41:30.000 0.006259878469 -182.154387 0.99660206135047 -358.538181 532.3718255 511.8971893 0.1634 /L 1843-Feb-27 21:42:00.000 0.006223658048 -178.629709 0.99652966921704 -362.576164 533.9187734 513.5643921 0.1670 /L 1843-Feb-27 21:42:30.000 0.006188153677 -175.016798 0.99645646360832 -366.631137 535.4483019 515.2169879 0.1705 /L 1843-Feb-27 21:43:00.000 0.006153383144 -171.315129 0.99638244131468 -370.700811 536.9590284 516.8536295 0.1741 /L 1843-Feb-27 21:43:30.000 0.006119364330 -167.524300 0.99630759959944 -374.782769 538.4495377 518.4729350 0.1777 /L 1843-Feb-27 21:44:00.000 0.006086115188 -163.644034 0.99623193622235 -378.874462 539.9183837 520.0734895 0.1813 /L 1843-Feb-27 21:44:30.000 0.006053653712 -159.674191 0.99615544947507 -382.973217 541.3640917 521.6538466 0.1850 /L 1843-Feb-27 21:45:00.000 0.006021997913 -155.614776 0.99607813819249 -387.076232 542.7851608 523.2125318 0.1886 /L 1843-Feb-27 21:45:30.000 0.005991165785 -151.465945 0.99600000178780 -391.180578 544.1800672 524.7480439 0.1922 /L 1843-Feb-27 21:46:00.000 0.005961175276 -147.228012 0.99592104027517 -395.283207 545.5472667 526.2588587 0.1958 /L 1843-Feb-27 21:46:30.000 0.005932044256 -142.901462 0.99584125429422 -399.380947 546.8851983 527.7434318 0.1995 /L 1843-Feb-27 21:47:00.000 0.005903790481 -138.486953 0.99576064513387 -403.470512 548.1922879 529.2002022 0.2031 /L 1843-Feb-27 21:47:30.000 0.005876431557 -133.985325 0.99567921475513 -407.548505 549.4669523 530.6275959 0.2067 /L 1843-Feb-27 21:48:00.000 0.005849984905 -129.397605 0.99559696581304 -411.611424 550.7076034 532.0240299 0.2103 /L 1843-Feb-27 21:48:30.000 0.005824467719 -124.725015 0.99551390167453 -415.655667 551.9126526 533.3879170 0.2139 /L 1843-Feb-27 21:49:00.000 0.005799896932 -119.968975 0.99543002644820 -419.677543 553.0805156 534.7176695 0.2175 /L 1843-Feb-27 21:49:30.000 0.005776289170 -115.131109 0.99534534498603 -423.673276 554.2096174 536.0117046 0.2210 /L 1843-Feb-27 21:50:00.000 0.005753660712 -110.213246 0.99525986290971 -427.639018 555.2983977 537.2684494 0.2245 /L 1843-Feb-27 21:50:30.000 0.005732027451 -105.217425 0.99517358662175 -431.570859 556.3453158 538.4863459 0.2280 /L 1843-Feb-27 21:51:00.000 0.005711404850 -100.145895 0.99508652331721 -435.464836 557.3488568 539.6638567 0.2315 /L 1843-Feb-27 21:51:30.000 0.005691807899 -95.0011160 0.99499868099297 -439.316945 558.3075369 540.7994704 0.2350 /L 1843-Feb-27 21:52:00.000 0.005673251073 -89.7857579 0.99491006845461 -443.123156 559.2199091 541.8917070 0.2384 /L 1843-Feb-27 21:52:30.000 0.005655748291 -84.5026994 0.99482069532062 -446.879426 560.0845694 542.9391244 0.2418 /L 1843-Feb-27 21:53:00.000 0.005639312873 -79.1550237 0.99473057202097 -450.581710 560.9001626 543.9403236 0.2452 /L 1843-Feb-27 21:53:30.000 0.005623957501 -73.7460153 0.99463970980719 -454.225980 561.6653877 544.8939544 0.2485 /L 1843-Feb-27 21:54:00.000 0.005609694174 -68.2791530 0.99454812073069 -457.808236 562.3790042 545.7987218 0.2518 /L 1843-Feb-27 21:54:30.000 0.005596534178 -62.7581035 0.99445581764673 -461.324525 563.0398376 546.6533911 0.2551 /L 1843-Feb-27 21:55:00.000 0.005584488041 -57.1867132 0.99436281420090 -464.770955 563.6467848 547.4567936 0.2583 /L 1843-Feb-27 21:55:30.000 0.005573565502 -51.5689979 0.99426912481530 -468.143709 564.1988193 548.2078319 0.2615 /L 1843-Feb-27 21:56:00.000 0.005563775476 -45.9091327 0.99417476467152 -471.439066 564.6949965 548.9054853 0.2647 /L 1843-Feb-27 21:56:30.000 0.005555126027 -40.2114390 0.99407974969047 -474.653410 565.1344580 549.5488140 0.2678 /L 1843-Feb-27 21:57:00.000 0.005547624332 -34.4803720 0.99398409650905 -477.783250 565.5164363 550.1369641 0.2708 /L 1843-Feb-27 21:57:30.000 0.005541276666 -28.7205060 0.99388782245374 -480.825236 565.8402584 550.6691716 0.2739 /L 1843-Feb-27 21:58:00.000 0.005536088367 -22.9365191 0.99379094550820 -483.776168 566.1053497 551.1447660 0.2768 /L 1843-Feb-27 21:58:30.000 0.005532063831 -17.1331775 0.99369348429341 -486.633014 566.3112365 551.5631735 0.2798 /L 1843-Feb-27 21:59:00.000 0.005529206482 -11.3153183 0.99359545801429 -489.392923 566.4575490 551.9239202 0.2826 /L 1843-Feb-27 21:59:30.000 0.005527518768 -5.4878321 0.99349688643459 -492.053234 566.5440229 552.2266337 0.2855 /L 1843-Feb-27 22:00:00.000 0.005527002151 0.3443550 0.99339778983415 -494.611490 566.5705010 552.4710454 0.2882 /L 1843-Feb-27 22:00:30.000 0.005527657099 6.1762990 0.99329818896704 -497.065446 566.5369342 552.6569915 0.2910 /L 1843-Feb-27 22:01:00.000 0.005529483085 12.0030568 0.99319810501792 -499.413079 566.4433814 552.7844134 0.2936 /L 1843-Feb-27 22:01:30.000 0.005532478589 17.8197046 0.99309755955680 -501.652593 566.2900095 552.8533581 0.2962 /L 1843-Feb-27 22:02:00.000 0.005536641107 23.6213556 0.99299657449240 -503.782427 566.0770924 552.8639775 0.2988 /L 1843-Feb-27 22:02:30.000 0.005541967155 29.4031785 0.99289517202132 -505.801259 565.8050092 552.8165272 0.3013 /L 1843-Feb-27 22:03:00.000 0.005548452282 35.1604137 0.99279337459256 -507.708009 565.4742431 552.7113651 0.3038 /L 1843-Feb-27 22:03:30.000 0.005556091093 40.8883917 0.99269120483929 -509.501839 565.0853777 552.5489492 0.3062 /L 1843-Feb-27 22:04:00.000 0.005564877260 46.5825478 0.99258868554273 -511.182155 564.6390947 552.3298349 0.3085 /L 1843-Feb-27 22:04:30.000 0.005574803551 52.2384381 0.99248583957999 -512.748606 564.1361704 552.0546716 0.3108 /L 1843-Feb-27 22:05:00.000 0.005585861852 57.8517531 0.99238268987553 -514.201080 563.5774710 551.7241999 0.3130 /L 1843-Feb-27 22:05:30.000 0.005598043195 63.4183315 0.99227925935336 -515.539699 562.9639492 551.3392465 0.3152 /L 1843-Feb-27 22:06:00.000 0.005611337793 68.9341716 0.99217557089004 -516.764816 562.2966388 550.9007208 0.3173 /L 1843-Feb-27 22:06:30.000 0.005625735071 74.3954425 0.99207164726899 -517.877011 561.5766499 550.4096099 0.3194 /L 1843-Feb-27 22:07:00.000 0.005641223699 79.7984940 0.99196751113276 -518.877074 560.8051636 549.8669735 0.3214 /L 1843-Feb-27 22:07:30.000 0.005657791631 85.1398635 0.99186318495362 -519.766009 559.9834265 549.2739388 0.3234 /L 1843-Feb-27 22:08:00.000 0.005675426147 90.4162846 0.99175869097270 -520.545015 559.1127451 548.6316953 0.3253 /L 1843-Feb-27 22:08:30.000 0.005694113885 95.6246920 0.99165405117430 -521.215479 558.1944800 547.9414892 0.3271 /L 1843-Feb-27 22:09:00.000 0.005713840892 100.762226 0.99154928724572 -521.778966 557.2300397 547.2046176 0.3289 /L 1843-Feb-27 22:09:30.000 0.005734592655 105.826234 0.99144442054263 -522.237209 556.2208754 546.4224235 0.3306 /L 1843-Feb-27 22:10:00.000 0.005756354152 110.814277 0.99133947205683 -522.592091 555.1684746 545.5962892 0.3323 /L 1843-Feb-27 22:10:30.000 0.005779109890 115.724123 0.99123446238637 -522.845642 554.0743556 544.7276316 0.3339 /L 1843-Feb-27 22:11:00.000 0.005802843947 120.553753 0.99112941170814 -523.000018 552.9400616 543.8178963 0.3354 /L 1843-Feb-27 22:11:30.000 0.005827540018 125.301357 0.99102433975295 -523.057493 551.7671553 542.8685520 0.3369 /L 1843-Feb-27 22:12:00.000 0.005853181452 129.965329 0.99091926577983 -523.020448 550.5572135 541.8810855 0.3384 /L 1843-Feb-27 22:12:30.000 0.005879751296 134.544269 0.99081420856945 -522.891354 549.3118219 540.8569968 0.3398 /L 1843-Feb-27 22:13:00.000 0.005907232334 139.036973 0.99070918638667 -522.672764 548.0325699 539.7977935 0.3411 /L 1843-Feb-27 22:13:30.000 0.005935607130 143.442431 0.99060421697887 -522.367298 546.7210463 538.7049869 0.3424 /L 1843-Feb-27 22:14:00.000 0.005964858060 147.759820 0.99049931756001 -521.977635 545.3788345 537.5800871 0.3436 /L 1843-Feb-27 22:14:30.000 0.005994967355 151.988499 0.99039450480025 -521.506499 544.0075084 536.4245987 0.3448 /L 1843-Feb-27 22:15:00.000 0.006025917135 156.128002 0.99028979481786 -520.956646 542.6086283 535.2400173 0.3459 /L 1843-Feb-27 22:15:30.000 0.006057689440 160.178027 0.99018520317319 -520.330861 541.1837375 534.0278255 0.3470 /L 1843-Feb-27 22:16:00.000 0.006090266268 164.138435 0.99008074486475 -519.631942 539.7343588 532.7894896 0.3480 /L 1843-Feb-27 22:16:30.000 0.006123629605 168.009235 0.98997643432373 -518.862691 538.2619915 531.5264563 0.3490 /L 1843-Feb-27 22:17:00.000 0.006157761447 171.790582 0.98987228542712 -518.025910 536.7681086 530.2401504 0.3499 /L 1843-Feb-27 22:17:30.000 0.006192643843 175.482765 0.98976831147911 -517.124387 535.2541541 528.9319715 0.3508 /L 1843-Feb-27 22:18:00.000 0.006228258908 179.086199 0.98966452522746 -516.160895 533.7215413 527.6032920 0.3516 /L 1843-Feb-27 22:18:30.000 0.006264588853 182.601420 0.98956093886454 -515.138177 532.1716503 526.2554553 0.3524 /L 1843-Feb-27 22:19:00.000 0.006301616010 186.029071 0.98945756403314 -514.058948 530.6058264 524.8897738 0.3531 /L 1843-Feb-27 22:19:30.000 0.006339322848 189.369900 0.98935441183342 -512.925883 529.0253792 523.5075270 0.3538 /L 1843-Feb-27 22:20:00.000 0.006377691999 192.624748 0.98925149283101 -511.741617 527.4315806 522.1099609 0.3545 /L 1843-Feb-27 22:20:30.000 0.006416706269 195.794543 0.98914881706605 -510.508735 525.8256645 520.6982863 0.3551 /L 1843-Feb-27 22:21:00.000 0.006456348665 198.880291 0.98904639405987 -509.229773 524.2088256 519.2736782 0.3556 /L 1843-Feb-27 22:21:30.000 0.006496602394 201.883069 0.98894423283870 -507.907210 522.5822193 517.8372752 0.3561 /L 1843-Feb-27 22:22:00.000 0.006537450896 204.804019 0.98884234192552 -506.543469 520.9469606 516.3901785 0.3566 /L 1843-Feb-27 22:22:30.000 0.006578877840 207.644342 0.98874072936500 -505.140912 519.3041249 514.9334523 0.3570 /L 1843-Feb-27 22:23:00.000 0.006620867145 210.405286 0.98863940273267 -503.701837 517.6547469 513.4681231 0.3574 /L 1843-Feb-27 22:23:30.000 0.006663402986 213.088148 0.98853836914772 -502.228478 515.9998216 511.9951796 0.3578 /L 1843-Feb-27 22:24:00.000 0.006706469799 215.694261 0.98843763528615 -500.723005 514.3403039 510.5155733 0.3581 /L 1843-Feb-27 22:24:30.000 0.006750052297 218.224992 0.98833720739412 -499.187519 512.6771093 509.0302184 0.3584 /L 1843-Feb-27 22:25:00.000 0.006794135466 220.681735 0.98823709130150 -497.624055 511.0111145 507.5399921 0.3586 /L 1843-Feb-27 22:25:30.000 0.006838704579 223.065908 0.98813729243234 -496.034578 509.3431573 506.0457353 0.3588 /L 1843-Feb-27 22:26:00.000 0.006883745191 225.378945 0.98803781583124 -494.420987 507.6740382 504.5482527 0.3590 /L 1843-Feb-27 22:26:30.000 0.006929243152 227.622297 0.98793866615803 -492.785112 506.0045202 503.0483140 0.3591 /L 1843-Feb-27 22:27:00.000 0.006975184601 229.797421 0.98783984771411 -491.128717 504.3353302 501.5466538 0.3592 /L 1843-Feb-27 22:27:30.000 0.007021555973 231.905783 0.98774136445278 -489.453497 502.6671597 500.0439732 0.3593 /L 1843-Feb-27 22:28:00.000 0.007068343999 233.948849 0.98764321999270 -487.761082 501.0006654 498.5409398 0.3593 /L 1843-Feb-27 22:28:30.000 0.007115535701 235.928086 0.98754541763109 -486.053036 499.3364706 497.0381889 0.3593 /L 1843-Feb-27 22:29:00.000 0.007163118400 237.844955 0.98744796035681 -484.330859 497.6751657 495.5363245 0.3593 /L 1843-Feb-27 22:29:30.000 0.007211079708 239.700912 0.98735085086316 -482.595989 496.0173095 494.0359198 0.3593 /L 1843-Feb-27 22:30:00.000 0.007259407529 241.497404 0.98725409156043 -480.849802 494.3634301 492.5375184 0.3592 /L $$EOE ***************************************************************************************************************************** Column meaning: ** WARNING ** The initial state available for this object was a Keplerian two-body orbital element set, not osculating elements. This means the orbit is probably very poorly determined. Predictions for times many months or years from the epoch may not be suitable for high-accuracy applications or expectations. Since the epoch is inside or within ~30 days of the relatively short data arc, the elements (such as they are) were numerically propagated with perturbations, just as if they were osculating elements. 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. '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 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 = '1843 D1' START_TIME = '1843-02-27 21:30' STOP_TIME = '1843-02-27 22:30' STEP_SIZE = '120' QUANTITIES = '19,20,22,23'