1866 Sisyphus (1972 XA)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5381207270 ± 5.42e-09
Semi-major axis (a)1.8933719410 AU ± 4.50e-10
Inclination (i)41.20633494° ± 7.87e-07
Long. of Asc. Node (Ω)63.44668864° ± 1.04e-06
Arg. of Perihelion (ω)293.09862767° ± 1.07e-06
Mean Anomaly (M)140.66424737° ± 8.67e-07
Mean Motion (n)0.3783191899°/day ± 1.35e-10
Perihelion dist (q)0.87450926 AU ± 1.03e-08
Aphelion dist (Q)2.91223463 AU ± 1.03e-08
Orbital Period2.60527700 yr ± 9.28e-10
Physical Parameters
H (abs. magnitude)12.48
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.220″
Uncertainty0
Orbit TypeApollo
MOID0.102869 AU
Observations Used9210
Radar Obs Used1
Gaia Obs Used79
Oppositions38
Arc Total1955-2026
First Observation Used1955-01-26
Last Observation Used2026-04-06
Observations (11960)
Date Type RA Dec Mag Band Observatory
2019-07-05 10:44:30 S 07 00 57.254 -65 13 22.94 V C57
2019-07-05 10:44:30 s 1 +154245.62 1 +154898.09 3950.0 C57
2019-07-05 11:14:30 S 07 00 58.121 -65 12 10.94 V C57
2019-07-05 11:14:30 s 1 +154049.13 6 +157352.97 3820.0 C57
2019-07-05 11:44:30 S 07 00 59.234 -65 10 50.81 V C57
2019-07-05 11:44:30 s 1 +153836.44 1 +159791.29 980.0 C57
2019-07-05 12:14:30 S 07 01 00.091 -65 09 36.76 V C57
2019-07-05 12:14:30 s 1 +153607.88 2 +162213.12 6750.0 C57
2019-07-05 12:44:30 S 07 01 01.282 -65 08 18.96 V C57
2019-07-05 12:44:30 s 1 +153363.79 5 +164618.54 2450.0 C57
2019-07-05 13:14:30 S 07 01 02.069 -65 07 03.86 V C57
2019-07-05 13:14:30 s 1 +153104.51 0 +167007.64 9340.0 C57
2019-07-05 13:44:30 S 07 01 03.000 -65 05 49.92 V C57
2019-07-05 13:44:30 s 1 +152830.34 6 +169380.49 8650.0 C57
2019-07-05 14:14:30 S 07 01 03.914 -65 04 31.12 V C57
2019-07-05 14:14:30 s 1 +152541.61 2 +171737.19 1590.0 C57
2019-07-05 14:44:30 S 07 01 04.846 -65 03 16.34 V C57
2019-07-05 14:44:30 s 1 +152238.61 2 +174077.81 9330.0 C57
2019-07-05 15:44:30 S 07 01 06.626 -65 00 45.29 V C57
2019-07-05 15:44:30 s 1 +151590.97 9 +178711.17 3760.0 C57
2019-07-05 16:14:30 S 07 01 07.594 -64 59 29.83 V C57
2019-07-05 16:14:30 s 1 +151246.91 1 +181004.09 2660.0 C57
2019-07-05 16:44:30 S 07 01 08.390 -64 58 12.61 V C57
2019-07-05 16:44:30 s 1 +150889.70 6 +183281.27 770.0 C57
2019-07-05 17:14:30 S 07 01 09.374 -64 56 58.56 V C57
2019-07-05 17:14:30 s 1 +150519.63 0 +185542.80 9130.0 C57
2019-07-05 17:44:30 S 07 01 10.123 -64 55 41.34 V C57
2019-07-05 17:44:30 s 1 +150136.93 9 +187788.77 8760.0 C57
2019-07-05 18:14:30 S 07 01 11.136 -64 54 26.50 V C57
2019-07-05 18:14:30 s 1 +149741.88 5 +190019.27 640.0 C57
2019-07-05 18:44:30 S 07 01 11.873 -64 53 09.78 V C57
2019-07-05 18:44:30 s 1 +149334.71 2 +192234.38 5730.0 C57
2019-07-05 19:14:30 S 07 01 12.888 -64 51 52.70 V C57
2019-07-05 19:14:30 s 1 +148915.65 9 +194434.18 4980.0 C57
2019-07-05 19:44:30 S 07 01 13.558 -64 50 40.02 V C57
2019-07-05 19:44:30 s 1 +148484.95 9 +196618.77 9300.0 C57
2019-07-05 20:14:30 S 07 01 14.554 -64 49 20.96 V C57
2019-07-05 20:14:30 s 1 +148042.83 8 +198788.21 9600.0 C57
2019-07-05 20:44:30 S 07 01 15.264 -64 48 08.82 V C57
2019-07-05 20:44:30 s 1 +147589.51 7 +200942.61 6760.0 C57
2019-07-05 21:14:30 S 07 01 16.087 -64 46 50.27 V C57
2019-07-05 21:14:30 s 1 +147125.21 3 +203082.04 1620.0 C57
2019-07-05 21:44:30 S 07 01 16.934 -64 45 35.03 V C57
2019-07-05 21:44:30 s 1 +146650.13 6 +205206.59 5040.0 C57
2019-07-05 22:14:30 S 07 01 17.604 -64 44 21.30 V C57
2019-07-05 22:14:30 s 1 +146164.49 2 +207316.34 7820.0 C57
2019-07-05 22:44:30 S 07 01 18.554 -64 43 03.11 V C57
2019-07-05 22:44:30 s 1 +145668.48 1 +209411.38 780.0 C57
2019-07-05 23:14:30 S 07 01 19.745 -64 41 47.87 V C57
2019-07-05 23:14:30 s 1 +145162.29 9 +211491.78 4690.0 C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-12-08 00:00:00 -295248 20 Hz 2380 -1 -1
1985-12-08.000000 -29524800 2000 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)