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
2019-07-15 17:14:30 s 1 -206892.17 4 +154489.30 2010.0 C57
2019-07-15 17:44:30 S 07 03 36.530 -55 24 24.84 V C57
2019-07-15 17:44:30 s 1 -206654.77 2 +152379.15 4780.0 C57
2019-07-15 18:14:30 S 07 03 36.742 -55 23 17.74 V C57
2019-07-15 18:14:30 s 1 -206402.85 2 +150258.40 3950.0 C57
2019-07-15 18:44:30 S 07 03 37.152 -55 22 11.35 V C57
2019-07-15 18:44:30 s 1 -206136.19 9 +148127.01 8780.0 C57
2019-07-15 19:14:30 S 07 03 37.327 -55 21 02.99 V C57
2019-07-15 19:14:30 s 1 -205854.59 0 +145984.98 8520.0 C57
2019-07-15 19:44:30 S 07 03 37.673 -55 19 56.46 V C57
2019-07-15 19:44:30 s 1 -205557.80 2 +143832.26 2390.0 C57
2019-07-15 20:14:30 S 07 03 38.081 -55 18 48.82 V C57
2019-07-15 20:14:30 s 1 -205245.60 3 +141668.86 9610.0 C57
2019-07-15 20:44:30 S 07 03 38.249 -55 17 42.25 V C57
2019-07-15 20:44:30 s 1 -204917.75 8 +139494.75 9350.0 C57
2019-07-15 21:14:30 S 07 03 38.712 -55 16 35.29 V C57
2019-07-15 21:14:30 s 1 -204574.02 5 +137309.92 780.0 C57
2019-07-15 21:44:30 S 07 03 38.954 -55 15 27.22 V C57
2019-07-15 21:44:30 s 1 -204214.15 6 +135114.34 3050.0 C57
2019-07-15 22:14:30 S 07 03 39.295 -55 14 22.02 V C57
2019-07-15 22:14:30 s 1 -203837.89 9 +132908.01 5280.0 C57
2019-07-15 22:44:30 S 07 03 39.677 -55 13 12.79 V C57
2019-07-15 22:44:30 s 1 -203444.99 5 +130690.92 6580.0 C57
2019-07-15 23:14:30 S 07 03 39.881 -55 12 07.88 V C57
2019-07-15 23:14:30 s 1 -203035.17 8 +128463.05 6020.0 C57
2019-07-15 23:44:30 S 07 03 40.313 -55 10 59.05 V C57
2019-07-15 23:44:30 s 1 -202608.17 6 +126224.40 2670.0 C57
2019-07-16 00:14:30 S 07 03 40.596 -55 09 52.56 V C57
2019-07-16 00:14:30 s 1 -202163.71 1 +123974.95 5540.0 C57
2019-07-16 00:44:30 S 07 03 40.956 -55 08 46.75 V C57
2019-07-16 00:44:30 s 1 -201701.49 8 +121714.71 3650.0 C57
2019-07-16 01:14:30 S 07 03 41.333 -55 07 37.67 V C57
2019-07-16 01:14:30 s 1 -201221.24 3 +119443.67 5970.0 C57
2019-07-16 01:44:30 S 07 03 41.587 -55 06 33.26 V C57
2019-07-16 01:44:30 s 1 -200722.64 8 +117161.82 1460.0 C57
2019-07-16 02:14:30 S 07 03 42.048 -55 05 24.11 V C57
2019-07-16 02:14:30 s 1 -200205.40 5 +114869.18 9040.0 C57
2019-07-16 02:44:30 S 07 03 42.334 -55 04 18.34 V C57
2019-07-16 02:44:30 s 1 -199669.19 9 +112565.74 7610.0 C57
2019-07-16 03:14:30 S 07 03 42.725 -55 03 11.48 V C57
2019-07-16 03:14:30 s 1 -199113.70 6 +110251.51 6020.0 C57
2019-08-13 09:41:18 C 07 10 40.22 -35 28 31.2 o W92
2019-08-13 09:46:40 C 07 10 40.30 -35 28 22.5 o W92
2019-09-08 07:13:03 C 07 27 40.88 -17 39 59.7 q Y00
2019-09-08 07:24:10 C 07 27 41.35 -17 39 39.1 q Y00
2019-09-08 07:35:01 C 07 27 41.79 -17 39 19.3 q Y00
2019-09-10 07:15:50 C 07 29 48.17 -16 10 28.7 q Y00
2019-09-10 07:26:43 C 07 29 48.61 -16 10 08.9 q Y00
2019-09-10 07:37:26 C 07 29 49.12 -16 09 48.4 q Y00
2019-09-11 14:24:49 C 07 31 14.45 -15 12 01.2 V T05
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)