******************************************************************************* JPL/HORIZONS Great southern comet (C/1887 B1) 2024-May-06 21:50:12 Rec #:90001763 Soln.date: - # obs: 15 (8 days) IAU76/J2000 helio. eclip. TWO-BODY elements (au, days, deg., period=Julian yrs) EPOCH= 2410283.434 ! 1887-Jan-11.9340000 (TDB) RMSW= n.a. EC= 1. QR= .00483 TP= 2410283.4339999999 OM= 4.585 W= 83.51300000000001 IN= 144.383 A= 9.999999E99 ADIST= 9.999999E99 PER= 9.999999E99 ANGMOM= .001690713 DAN= .00868 DDN= .01089 L= 282.5474112 B= 35.3546364 TP= 1887-Jan-11.9339999999 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: 1887-01-21 to 1887-01-29 2: ; TWO_BODY;time units are UT, but set to ET; original epoch not defined, assumed ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon May 6 21:50:12 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Great southern comet (C/1887 B1) {source: SAO_200820} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1887-Jan-11 22:00:00.0000 UT Stop time : A.D. 1887-Jan-11 23:00:00.0000 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.240506.p240730 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-06. PREDICTS-> 2024-JUL-29 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= 2410283.434 ! 1887-Jan-11.9340000 (TDB) RMSW= n.a. EC= 1. QR= .00483 TP= 2410283.4339999999 OM= 4.585 W= 83.51300000000001 IN= 144.383 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 8.557986733084340E-04 Y=-4.639611519639444E-03 Z= 1.034656260596968E-03 VX=-3.441200833839362E-01 VY=-6.407138167172184E-02 VZ=-2.676073579930761E-03 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 1887-Jan-11 22:00:00.000 0.007297107446 -286.717791 0.98699608578649 136.513451 493.0995651 466.8222771 0.3729 /T 1887-Jan-11 22:00:30.000 0.007239745895 -285.610131 0.98702329115780 134.925074 495.0491171 468.6919050 0.3682 /T 1887-Jan-11 22:01:00.000 0.007182611419 -284.448724 0.98705017317818 133.285459 497.0141211 470.5766368 0.3635 /T 1887-Jan-11 22:01:30.000 0.007125714976 -283.231631 0.98707672142471 131.593066 498.9943776 472.4762936 0.3588 /T 1887-Jan-11 22:02:00.000 0.007069067922 -281.956851 0.98710292516096 129.846320 500.9896575 474.3906688 0.3541 /T 1887-Jan-11 22:02:30.000 0.007012682018 -280.622323 0.98712877333235 128.043612 502.9997000 476.3195260 0.3494 /T 1887-Jan-11 22:03:00.000 0.006956569443 -279.225927 0.98715425455793 126.183298 505.0242110 478.2625970 0.3447 /T 1887-Jan-11 22:03:30.000 0.006900742810 -277.765483 0.98717935712235 124.263700 507.0628607 480.2195802 0.3400 /T 1887-Jan-11 22:04:00.000 0.006845215175 -276.238750 0.98720406897174 122.283110 509.1152811 482.1901381 0.3352 /T 1887-Jan-11 22:04:30.000 0.006790000045 -274.643427 0.98722837770615 120.239787 511.1810646 484.1738952 0.3305 /T 1887-Jan-11 22:05:00.000 0.006735111401 -272.977156 0.98725227057248 118.131963 513.2597603 486.1704355 0.3257 /T 1887-Jan-11 22:05:30.000 0.006680563696 -271.237520 0.98727573446156 115.957844 515.3508727 488.1793009 0.3210 /T 1887-Jan-11 22:06:00.000 0.006626371878 -269.422045 0.98729875589997 113.715610 517.4538585 490.1999875 0.3162 /T 1887-Jan-11 22:06:30.000 0.006572551396 -267.528203 0.98732132104814 111.403420 519.5681239 492.2319442 0.3115 /T 1887-Jan-11 22:07:00.000 0.006519118209 -265.553412 0.98734341569511 109.019415 521.6930225 494.2745697 0.3067 /T 1887-Jan-11 22:07:30.000 0.006466088802 -263.495041 0.98736502525428 106.561724 523.8278517 496.3272094 0.3020 /T 1887-Jan-11 22:08:00.000 0.006413480190 -261.350412 0.98738613476291 104.028462 525.9718504 498.3891535 0.2972 /T 1887-Jan-11 22:08:30.000 0.006361309931 -259.116804 0.98740672887945 101.417741 528.1241958 500.4596335 0.2925 /T 1887-Jan-11 22:09:00.000 0.006309596134 -256.791457 0.98742679188182 98.7276706 530.2840008 502.5378197 0.2878 /T 1887-Jan-11 22:09:30.000 0.006258357462 -254.371577 0.98744630766988 95.9563667 532.4503107 504.6228185 0.2830 /T 1887-Jan-11 22:10:00.000 0.006207613145 -251.854343 0.98746525976589 93.1019562 534.6221007 506.7136694 0.2783 /T 1887-Jan-11 22:10:30.000 0.006157382980 -249.236911 0.98748363131668 90.1625846 536.7982723 508.8093420 0.2736 /T 1887-Jan-11 22:11:00.000 0.006107687336 -246.516424 0.98750140509978 87.1364234 538.9776512 510.9087338 0.2690 /T 1887-Jan-11 22:11:30.000 0.006058547157 -243.690017 0.98751856352842 84.0216781 541.1589838 513.0106668 0.2643 /T 1887-Jan-11 22:12:00.000 0.006009983962 -240.754831 0.98753508865852 80.8165976 543.3409349 515.1138852 0.2597 /T 1887-Jan-11 22:12:30.000 0.005962019843 -237.708018 0.98755096219982 77.5194838 545.5220848 517.2170529 0.2550 /T 1887-Jan-11 22:13:00.000 0.005914677460 -234.546753 0.98756616552664 74.1287019 547.7009272 519.3187511 0.2505 /T 1887-Jan-11 22:13:30.000 0.005867980042 -231.268250 0.98758067969094 70.6426919 549.8758667 521.4174759 0.2459 /T 1887-Jan-11 22:14:00.000 0.005821951367 -227.869771 0.98759448543986 67.0599800 552.0452167 523.5116367 0.2414 /T 1887-Jan-11 22:14:30.000 0.005776615759 -224.348640 0.98760756323353 63.3791922 554.2071981 525.5995542 0.2369 /T 1887-Jan-11 22:15:00.000 0.005731998077 -220.702262 0.98761989326560 59.5990671 556.3599372 527.6794590 0.2325 /T 1887-Jan-11 22:15:30.000 0.005688123684 -216.928137 0.98763145548873 55.7184701 558.5014657 529.7494909 0.2281 /T 1887-Jan-11 22:16:00.000 0.005645018443 -213.023878 0.98764222963980 51.7364090 560.6297189 531.8076977 0.2238 /T 1887-Jan-11 22:16:30.000 0.005602708679 -208.987228 0.98765219527122 47.6520484 562.7425368 533.8520357 0.2196 /T 1887-Jan-11 22:17:00.000 0.005561221157 -204.816085 0.98766133178335 43.4647265 564.8376638 535.8803696 0.2154 /T 1887-Jan-11 22:17:30.000 0.005520583052 -200.508517 0.98766961846053 39.1739715 566.9127499 537.8904736 0.2113 /T 1887-Jan-11 22:18:00.000 0.005480821906 -196.062785 0.98767703451160 34.7795185 568.9653527 539.8800329 0.2072 /T 1887-Jan-11 22:18:30.000 0.005441965590 -191.477369 0.98768355911260 30.2813262 570.9929397 541.8466461 0.2033 /T 1887-Jan-11 22:19:00.000 0.005404042262 -186.750985 0.98768917145307 25.6795951 572.9928916 543.7878279 0.1994 /T 1887-Jan-11 22:19:30.000 0.005367080310 -181.882616 0.98769385078678 20.9747840 574.9625063 545.7010134 0.1957 /T 1887-Jan-11 22:20:00.000 0.005331108302 -176.871529 0.98769757648485 16.1676270 576.8990040 547.5835621 0.1921 /T 1887-Jan-11 22:20:30.000 0.005296154924 -171.717304 0.98770032809252 11.2591509 578.7995330 549.4327641 0.1886 /T 1887-Jan-11 22:21:00.000 0.005262248916 -166.419856 0.98770208538971 6.2506902 580.6611770 551.2458459 0.1852 /T 1887-Jan-11 22:21:30.000 0.005229419000 -160.979459 0.98770282845409 1.1439027 582.4809623 553.0199785 0.1820 /T 1887-Jan-11 22:22:00.000 0.005197693812 -155.396769 0.98770253772734 -4.0592162 584.2558673 554.7522851 0.1789 /T 1887-Jan-11 22:22:30.000 0.005167101815 -149.672847 0.98770119408418 -9.3563218 585.9828325 556.4398512 0.1760 /T 1887-Jan-11 22:23:00.000 0.005137671222 -143.809176 0.98769877890357 -14.7447081 587.6587708 558.0797344 0.1733 /T 1887-Jan-11 22:23:30.000 0.005109429907 -137.807688 0.98769527414226 -20.2212993 589.2805805 559.6689759 0.1707 /T 1887-Jan-11 22:24:00.000 0.005082405312 -131.670772 0.98769066240949 -25.7826430 590.8451575 561.2046129 0.1683 /T 1887-Jan-11 22:24:30.000 0.005056624357 -125.401294 0.98768492704319 -31.4249058 592.3494094 562.6836917 0.1662 /T 1887-Jan-11 22:25:00.000 0.005032113341 -119.002610 0.98767805218702 -37.1438712 593.7902703 564.1032813 0.1642 /T 1887-Jan-11 22:25:30.000 0.005008897842 -112.478569 0.98767002286650 -42.9349415 595.1647162 565.4604885 0.1625 /T 1887-Jan-11 22:26:00.000 0.004987002619 -105.833524 0.98766082506612 -48.7931421 596.4697812 566.7524731 0.1610 /T 1887-Jan-11 22:26:30.000 0.004966451511 -99.0723332 0.98765044580348 -54.7131291 597.7025737 567.9764634 0.1598 /T 1887-Jan-11 22:27:00.000 0.004947267334 -92.2003524 0.98763887320275 -60.6892014 598.8602939 569.1297724 0.1588 /T 1887-Jan-11 22:27:30.000 0.004929471782 -85.2234341 0.98762609656570 -66.7153144 599.9402504 570.2098142 0.1580 /T 1887-Jan-11 22:28:00.000 0.004913085330 -78.1479128 0.98761210643782 -72.7851001 600.9398776 571.2141203 0.1576 /T 1887-Jan-11 22:28:30.000 0.004898127137 -70.9805899 0.98759689467179 -78.8918882 601.8567523 572.1403555 0.1573 /L 1887-Jan-11 22:29:00.000 0.004884614954 -63.7287135 0.98758045448656 -85.0287322 602.6886106 572.9863339 0.1573 /L 1887-Jan-11 22:29:30.000 0.004872565039 -56.3999523 0.98756278051868 -91.1884388 603.4333635 573.7500337 0.1576 /L 1887-Jan-11 22:30:00.000 0.004861992072 -49.0023663 0.98754386886951 -97.3636001 604.0891118 574.4296122 0.1582 /L 1887-Jan-11 22:30:30.000 0.004852909080 -41.5443724 0.98752371714603 -103.546628 604.6541604 575.0234188 0.1589 /L 1887-Jan-11 22:31:00.000 0.004845327373 -34.0347060 0.98750232449156 -109.729795 605.1270309 575.5300072 0.1600 /L 1887-Jan-11 22:31:30.000 0.004839256479 -26.4823790 0.98747969161119 -115.905269 605.5064730 575.9481467 0.1613 /L 1887-Jan-11 22:32:00.000 0.004834704095 -18.8966347 0.98745582078948 -122.065161 605.7914742 576.2768313 0.1628 /L 1887-Jan-11 22:32:30.000 0.004831676046 -11.2868987 0.98743071589619 -128.201563 605.9812677 576.5152877 0.1645 /L 1887-Jan-11 22:33:00.000 0.004830176249 -3.6627293 0.98740438238657 -134.306596 606.0753387 576.6629813 0.1665 /L 1887-Jan-11 22:33:30.000 0.004830206699 3.9662347 0.98737682729308 -140.372451 606.0734284 576.7196200 0.1686 /L 1887-Jan-11 22:34:00.000 0.004831767448 11.5903280 0.98734805920453 -146.391432 605.9755361 576.6851569 0.1710 /L 1887-Jan-11 22:34:30.000 0.004834856613 19.1999115 0.98731808824026 -152.356003 605.7819193 576.5597902 0.1735 /L 1887-Jan-11 22:35:00.000 0.004839470382 26.7854256 0.98728692601614 -158.258824 605.4930915 576.3439614 0.1763 /L 1887-Jan-11 22:35:30.000 0.004845603036 34.3374427 0.98725458559780 -164.092793 605.1098184 576.0383521 0.1791 /L 1887-Jan-11 22:36:00.000 0.004853246981 41.8467175 0.98722108145297 -169.851083 604.6331113 575.6438777 0.1822 /L 1887-Jan-11 22:36:30.000 0.004862392788 49.3042352 0.98718642939028 -175.527173 604.0642199 575.1616809 0.1853 /L 1887-Jan-11 22:37:00.000 0.004873029243 56.7012575 0.98715064649552 -181.114882 603.4046220 574.5931219 0.1886 /L 1887-Jan-11 22:37:30.000 0.004885143411 64.0293638 0.98711375106293 -186.608395 602.6560122 573.9397684 0.1921 /L 1887-Jan-11 22:38:00.000 0.004898720696 71.2804907 0.98707576251617 -192.002285 601.8202897 573.2033832 0.1956 /L 1887-Jan-11 22:38:30.000 0.004913744923 78.4469654 0.98703670132992 -197.291533 600.8995438 572.3859115 0.1992 /L 1887-Jan-11 22:39:00.000 0.004930198415 85.5215361 0.98699658894840 -202.471543 599.8960389 571.4894665 0.2030 /L 1887-Jan-11 22:39:30.000 0.004948062083 92.4973975 0.98695544769552 -207.538156 598.8121991 570.5163145 0.2068 /L 1887-Jan-11 22:40:00.000 0.004967315514 99.3682113 0.98691330068863 -212.487653 597.6505911 569.4688594 0.2107 /L 1887-Jan-11 22:40:30.000 0.004987937070 106.128122 0.98687017175157 -217.316760 596.4139078 568.3496267 0.2146 /L 1887-Jan-11 22:41:00.000 0.005009903984 112.771769 0.98682608532128 -222.022648 595.1049509 567.1612472 0.2186 /L 1887-Jan-11 22:41:30.000 0.005033192460 119.294293 0.98678106636082 -226.602929 593.7266138 565.9064410 0.2227 /L 1887-Jan-11 22:42:00.000 0.005057777775 125.691338 0.98673514027379 -231.055647 592.2818649 564.5880014 0.2268 /L 1887-Jan-11 22:42:30.000 0.005083634380 131.959051 0.98668833281402 -235.379269 590.7737306 563.2087788 0.2310 /L 1887-Jan-11 22:43:00.000 0.005110735998 138.094078 0.98664067000393 -239.572674 589.2052796 561.7716660 0.2352 /L 1887-Jan-11 22:43:30.000 0.005139055726 144.093550 0.98659217805605 -243.635133 587.5796072 560.2795829 0.2394 /L 1887-Jan-11 22:44:00.000 0.005168566131 149.955076 0.98654288329003 -247.566296 585.8998204 558.7354630 0.2436 /L 1887-Jan-11 22:44:30.000 0.005199239344 155.676727 0.98649281206497 -251.366168 584.1690245 557.1422395 0.2479 /L 1887-Jan-11 22:45:00.000 0.005231047151 161.257020 0.98644199070393 -255.035096 582.3903093 555.5028337 0.2522 /L 1887-Jan-11 22:45:30.000 0.005263961081 166.694894 0.98639044543052 -258.573741 580.5667379 553.8201426 0.2565 /L 1887-Jan-11 22:46:00.000 0.005297952488 171.989695 0.98633820230996 -261.983056 578.7013352 552.0970295 0.2608 /L 1887-Jan-11 22:46:30.000 0.005332992631 177.141152 0.98628528718730 -265.264271 576.7970781 550.3363132 0.2651 /L 1887-Jan-11 22:47:00.000 0.005369052751 182.149353 0.98623172563750 -268.418858 574.8568862 548.5407603 0.2694 /L 1887-Jan-11 22:47:30.000 0.005406104137 187.014722 0.98617754292016 -271.448521 572.8836145 546.7130773 0.2737 /L 1887-Jan-11 22:48:00.000 0.005444118192 191.737993 0.98612276393123 -274.355165 570.8800459 544.8559039 0.2780 /L 1887-Jan-11 22:48:30.000 0.005483066497 196.320191 0.98606741316665 -277.140877 568.8488853 542.9718073 0.2823 /L 1887-Jan-11 22:49:00.000 0.005522920860 200.762601 0.98601151469056 -279.807905 566.7927550 541.0632774 0.2866 /L 1887-Jan-11 22:49:30.000 0.005563653373 205.066751 0.98595509209973 -282.358637 564.7141903 539.1327227 0.2909 /L 1887-Jan-11 22:50:00.000 0.005605236454 209.234382 0.98589816849994 -284.795581 562.6156362 537.1824673 0.2952 /L 1887-Jan-11 22:50:30.000 0.005647642889 213.267432 0.98584076648624 -287.121348 560.4994450 535.2147481 0.2995 /L 1887-Jan-11 22:51:00.000 0.005690845871 217.168011 0.98578290811882 -289.338632 558.3678745 533.2317135 0.3037 /L 1887-Jan-11 22:51:30.000 0.005734819028 220.938378 0.98572461491032 -291.450197 556.2230870 531.2354219 0.3080 /L 1887-Jan-11 22:52:00.000 0.005779536456 224.580929 0.98566590781654 -293.458856 554.0671488 529.2278416 0.3122 /L 1887-Jan-11 22:52:30.000 0.005824972743 228.098167 0.98560680722170 -295.367463 551.9020301 527.2108502 0.3164 /L 1887-Jan-11 22:53:00.000 0.005871102989 231.492696 0.98554733293490 -297.178896 549.7296059 525.1862355 0.3206 /L 1887-Jan-11 22:53:30.000 0.005917902822 234.767194 0.98548750418906 -298.896044 547.5516569 523.1556966 0.3247 /L 1887-Jan-11 22:54:00.000 0.005965348415 237.924407 0.98542733963290 -300.521800 545.3698705 521.1208444 0.3289 /L 1887-Jan-11 22:54:30.000 0.006013416496 240.967127 0.98536685733910 -302.059048 543.1858432 519.0832041 0.3330 /L 1887-Jan-11 22:55:00.000 0.006062084359 243.898183 0.98530607480014 -303.510654 541.0010822 517.0442161 0.3371 /L 1887-Jan-11 22:55:30.000 0.006111329866 246.720429 0.98524500893546 -304.879459 538.8170077 515.0052390 0.3412 /L 1887-Jan-11 22:56:00.000 0.006161131453 249.436731 0.98518367610010 -306.168271 536.6349553 512.9675512 0.3452 /L 1887-Jan-11 22:56:30.000 0.006211468133 252.049956 0.98512209208603 -307.379862 534.4561789 510.9323535 0.3493 /L 1887-Jan-11 22:57:00.000 0.006262319493 254.562969 0.98506027213333 -308.516956 532.2818531 508.9007721 0.3533 /L 1887-Jan-11 22:57:30.000 0.006313665693 256.978617 0.98499823094252 -309.582231 530.1130761 506.8738606 0.3573 /L 1887-Jan-11 22:58:00.000 0.006365487463 259.299726 0.98493598267883 -310.578309 527.9508730 504.8526029 0.3612 /L 1887-Jan-11 22:58:30.000 0.006417766099 261.529095 0.98487354098616 -311.507759 525.7961978 502.8379163 0.3652 /L 1887-Jan-11 22:59:00.000 0.006470483452 263.669487 0.98481091900158 -312.373089 523.6499377 500.8306539 0.3691 /L 1887-Jan-11 22:59:30.000 0.006523621926 265.723628 0.98474812936155 -313.176745 521.5129147 498.8316075 0.3730 /L 1887-Jan-11 23:00:00.000 0.006577164470 267.694200 0.98468518421735 -313.921111 519.3858894 496.8415103 0.3768 /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 = '1887 B1' START_TIME = '1887-01-11 22:00' STOP_TIME = '1887-01-11 23:00' STEP_SIZE = '120' QUANTITIES = '19,20,22,23'