Orbit vs JPL Horizons — 2026-09-30 Heliocentric, ecliptic J2000. Errors: longitude and latitude in arcsec, distance in 1000 km. Nominal = JPL's stated Table 2 error (planets only). Years are astronomical (0 = 1 BC). Mercury (nominal 20″ / 15″ / 1k km) -2999 lon 34 lat 12 dist 0 -2000 lon 0 lat 1 dist 0 -1000 lon 8 lat 1 dist 1 1 lon 2 lat 3 dist 1 1000 lon 3 lat 5 dist 1 1500 lon 9 lat 2 dist 0 1650 lon 9 lat 1 dist 0 1800 lon 0 lat 2 dist 0 1900 lon 6 lat 2 dist 0 2000 lon 6 lat 2 dist 0 2026 lon 2 lat 4 dist 0 2100 lon 0 lat 1 dist 1 2333 lon 6 lat 1 dist 1 2499 lon 17 lat 10 dist 0 3000 lon 20 lat 19 dist 1 worst longitude error: 1.7× nominal Venus (nominal 40″ / 30″ / 8k km) -2999 lon 21 lat 19 dist 3 -2000 lon 16 lat 7 dist 1 -1000 lon 8 lat 22 dist 1 1 lon 5 lat 16 dist 7 1000 lon 12 lat 26 dist 1 1500 lon 7 lat 2 dist 5 1650 lon 1 lat 6 dist 1 1800 lon 14 lat 3 dist 4 1900 lon 17 lat 6 dist 3 2000 lon 8 lat 11 dist 0 2026 lon 5 lat 6 dist 7 2100 lon 4 lat 14 dist 3 2333 lon 13 lat 11 dist 9 2499 lon 25 lat 26 dist 4 3000 lon 31 lat 70 dist 4 worst longitude error: 0.8× nominal Earth (nominal 40″ / 15″ / 15k km) -2999 lon 45 lat 8 dist 5 -2000 lon 10 lat 2 dist 8 -1000 lon 1 lat 3 dist 2 1 lon 20 lat 6 dist 2 1000 lon 17 lat 6 dist 8 1500 lon 2 lat 3 dist 2 1650 lon 17 lat 1 dist 0 1800 lon 8 lat 1 dist 2 1900 lon 1 lat 1 dist 0 2000 lon 12 lat 2 dist 4 2026 lon 13 lat 2 dist 8 2100 lon 6 lat 3 dist 4 2333 lon 16 lat 6 dist 10 2499 lon 3 lat 8 dist 10 3000 lon 5 lat 17 dist 14 worst longitude error: 1.1× nominal Mars (nominal 100″ / 40″ / 30k km) -2999 lon 44 lat 23 dist 7 -2000 lon 9 lat 0 dist 14 -1000 lon 15 lat 24 dist 16 1 lon 71 lat 2 dist 40 1000 lon 21 lat 13 dist 22 1500 lon 11 lat 6 dist 6 1650 lon 53 lat 3 dist 3 1800 lon 23 lat 12 dist 18 1900 lon 56 lat 5 dist 2 2000 lon 83 lat 18 dist 7 2026 lon 88 lat 5 dist 49 2100 lon 98 lat 21 dist 8 2333 lon 100 lat 37 dist 26 2499 lon 28 lat 8 dist 20 3000 lon 152 lat 52 dist 18 worst longitude error: 1.5× nominal Jupiter (nominal 600″ / 100″ / 1000k km) -2999 lon 128 lat 71 dist 562 -2000 lon 140 lat 3 dist 663 -1000 lon 164 lat 36 dist 118 1 lon 185 lat 34 dist 428 1000 lon 111 lat 21 dist 102 1500 lon 347 lat 1 dist 232 1650 lon 213 lat 3 dist 250 1800 lon 16 lat 4 dist 5 1900 lon 61 lat 18 dist 92 2000 lon 485 lat 31 dist 232 2026 lon 5 lat 12 dist 177 2100 lon 267 lat 25 dist 514 2333 lon 431 lat 33 dist 611 2499 lon 367 lat 44 dist 145 3000 lon 77 lat 13 dist 226 worst longitude error: 0.8× nominal Saturn (nominal 1000″ / 100″ / 4000k km) -2999 lon 103 lat 33 dist 2086 -2000 lon 1049 lat 37 dist 2367 -1000 lon 702 lat 45 dist 260 1 lon 414 lat 51 dist 1318 1000 lon 155 lat 42 dist 493 1500 lon 362 lat 26 dist 1940 1650 lon 655 lat 43 dist 516 1800 lon 346 lat 32 dist 213 1900 lon 139 lat 8 dist 829 2000 lon 1153 lat 49 dist 2348 2026 lon 288 lat 24 dist 1130 2100 lon 635 lat 39 dist 1872 2333 lon 307 lat 39 dist 324 2499 lon 803 lat 57 dist 3679 3000 lon 206 lat 114 dist 755 worst longitude error: 1.2× nominal Uranus (nominal 2000″ / 30″ / 8000k km) -2999 lon 1008 lat 7 dist 166 -2000 lon 1195 lat 18 dist 3545 -1000 lon 10 lat 1 dist 8430 1 lon 1038 lat 19 dist 1752 1000 lon 371 lat 1 dist 5596 1500 lon 654 lat 3 dist 638 1650 lon 86 lat 0 dist 6179 1800 lon 1018 lat 2 dist 1202 1900 lon 456 lat 1 dist 5653 2000 lon 179 lat 3 dist 3505 2026 lon 315 lat 6 dist 1525 2100 lon 410 lat 1 dist 1642 2333 lon 484 lat 7 dist 4819 2499 lon 705 lat 6 dist 2935 3000 lon 549 lat 0 dist 2580 worst longitude error: 0.6× nominal Neptune (nominal 400″ / 15″ / 4000k km) -2999 lon 186 lat 5 dist 1112 -2000 lon 102 lat 0 dist 1552 -1000 lon 155 lat 1 dist 3867 1 lon 250 lat 5 dist 917 1000 lon 265 lat 8 dist 120 1500 lon 179 lat 6 dist 339 1650 lon 14 lat 2 dist 1432 1800 lon 161 lat 0 dist 2564 1900 lon 123 lat 3 dist 1099 2000 lon 75 lat 3 dist 927 2026 lon 132 lat 3 dist 680 2100 lon 258 lat 6 dist 2291 2333 lon 54 lat 3 dist 1457 2499 lon 71 lat 4 dist 815 3000 lon 46 lat 0 dist 377 worst longitude error: 0.7× nominal Pluto (baked Horizons elements) -2999 lon 0 lat 0 dist 0 -2000 lon 2 lat 1 dist 107 -1000 lon 7 lat 1 dist 65 1 lon 0 lat 0 dist 18 1000 lon 12 lat 0 dist 11 1500 lon 10 lat 2 dist 220 1650 lon 2 lat 1 dist 232 1800 lon 5 lat 2 dist 254 1900 lon 2 lat 1 dist 304 2000 lon 0 lat 3 dist 329 2026 lon 68 lat 0 dist 729 2100 lon 2 lat 2 dist 297 2333 lon 2 lat 1 dist 149 2499 lon 21 lat 5 dist 577 3000 lon 13 lat 0 dist 27 Ceres (baked Horizons elements) -2999 not shown (outside JPL's span) -2000 not shown (outside JPL's span) -1000 not shown (outside JPL's span) 1 not shown (outside JPL's span) 1000 not shown (outside JPL's span) 1500 not shown (outside JPL's span) 1650 lon 0 lat 0 dist 0 1800 lon 0 lat 0 dist 0 1900 lon 0 lat 0 dist 0 2000 lon 0 lat 0 dist 0 2026 lon 16 lat 0 dist 44 2100 lon 0 lat 0 dist 0 2333 lon 99 lat 18 dist 11 2499 lon 20 lat 3 dist 11 3000 not shown (outside JPL's span) Pallas (baked Horizons elements) -2999 not shown (outside JPL's span) -2000 not shown (outside JPL's span) -1000 not shown (outside JPL's span) 1 not shown (outside JPL's span) 1000 not shown (outside JPL's span) 1500 not shown (outside JPL's span) 1650 lon 0 lat 0 dist 0 1800 lon 0 lat 0 dist 0 1900 lon 0 lat 0 dist 0 2000 lon 0 lat 0 dist 0 2026 lon 27 lat 6 dist 29 2100 lon 0 lat 0 dist 0 2333 lon 132 lat 15 dist 111 2499 lon 24 lat 5 dist 20 3000 not shown (outside JPL's span) Juno (baked Horizons elements) -2999 not shown (outside JPL's span) -2000 not shown (outside JPL's span) -1000 not shown (outside JPL's span) 1 not shown (outside JPL's span) 1000 not shown (outside JPL's span) 1500 not shown (outside JPL's span) 1650 lon 0 lat 0 dist 0 1800 lon 0 lat 0 dist 0 1900 lon 0 lat 0 dist 0 2000 lon 0 lat 0 dist 0 2026 lon 3 lat 8 dist 79 2100 lon 0 lat 0 dist 0 2333 lon 247 lat 20 dist 84 2499 lon 28 lat 2 dist 32 3000 not shown (outside JPL's span) Vesta (baked Horizons elements) -2999 not shown (outside JPL's span) -2000 not shown (outside JPL's span) -1000 not shown (outside JPL's span) 1 not shown (outside JPL's span) 1000 not shown (outside JPL's span) 1500 not shown (outside JPL's span) 1650 lon 0 lat 0 dist 0 1800 lon 0 lat 0 dist 0 1900 lon 0 lat 0 dist 0 2000 lon 0 lat 0 dist 0 2026 lon 18 lat 1 dist 67 2100 lon 0 lat 0 dist 0 2333 lon 103 lat 10 dist 33 2499 lon 18 lat 8 dist 218 3000 not shown (outside JPL's span) Chiron (baked Horizons elements) -2999 not shown (outside JPL's span) -2000 not shown (outside JPL's span) -1000 not shown (outside JPL's span) 1 not shown (outside JPL's span) 1000 not shown (outside JPL's span) 1500 not shown (outside JPL's span) 1650 lon 0 lat 0 dist 0 1800 lon 0 lat 0 dist 0 1900 lon 0 lat 0 dist 0 2000 lon 0 lat 0 dist 0 2026 lon 8 lat 0 dist 79 2100 lon 0 lat 0 dist 0 2333 lon 17 lat 2 dist 607 2499 lon 7 lat 0 dist 9 3000 not shown (outside JPL's span)