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
2019-12-05 13:00:42 C 09 29 47.28 +63 23 18.0 V T08
2019-12-05 13:08:49 C 09 29 47.16 +63 23 35.6 V T08
2019-12-07 15:06:39 C 09 29 04.73 +65 09 48.6 V T05
2019-12-07 15:11:45 C 09 29 04.57 +65 09 59.2 V T05
2019-12-07 15:21:32 C 09 29 04.29 +65 10 19.6 V T05
2019-12-07 15:38:38 C 09 29 03.80 +65 10 55.0 V T05
2019-12-09 11:28:34 C 09 27 54.20 +66 40 40.2 V T08
2019-12-09 11:33:17 C 09 27 54.01 +66 40 49.7 V T08
2019-12-09 11:43:47 C 09 27 53.61 +66 41 11.2 V T08
2019-12-09 12:06:52 C 09 27 52.67 +66 41 58.3 V T08
2019-12-11 11:53:18 C 09 25 52.28 +68 16 00.2 V T05
2019-12-11 11:58:51 C 09 25 51.95 +68 16 11.0 V T05
2019-12-11 12:06:46 C 09 25 51.50 +68 16 26.3 V T05
2019-12-11 12:21:53 C 09 25 50.63 +68 16 56.0 V T05
2019-12-13 08:27:34 C 09 23 14.03 +69 39 56.2 u H21
2019-12-13 08:29:32 C 09 23 13.91 +69 40 00.1 u H21
2019-12-13 08:31:29 C 09 23 13.75 +69 40 03.6 u H21
2019-12-13 08:33:27 C 09 23 13.65 +69 40 07.3 u H21
2019-12-13 08:35:25 C 09 23 13.47 +69 40 11.0 u H21
2019-12-13 08:37:22 C 09 23 13.35 +69 40 14.4 u H21
2019-12-13 08:38:45 C 09 23 13.24 +69 40 17.0 u H21
2019-12-19 11:14:05 C 09 08 09.48 +73 47 51.5 V T05
2019-12-19 11:19:25 C 09 08 08.76 +73 48 00.3 V T05
2019-12-19 11:29:08 C 09 08 07.12 +73 48 15.2 V T05
2019-12-19 11:46:25 C 09 08 04.72 +73 48 43.0 V T05
2019-12-21 11:16:41 C 09 00 33.73 +74 58 26.8 V T08
2019-12-21 11:21:19 C 09 00 32.91 +74 58 33.5 V T08
2019-12-21 11:30:36 C 09 00 31.19 +74 58 46.6 V T08
2019-12-21 11:49:42 C 09 00 27.70 +74 59 14.0 V T08
2019-12-25 05:14:23 S 08 43 07.975 +76 53 19.07 V C57
2019-12-25 05:14:23 s 1 +132089.08 0 +63623.071 9680.0 C57
2019-12-25 05:44:23 S 08 43 02.158 +76 53 57.37 V C57
2019-12-25 05:44:23 s 1 +132932.91 6 +66913.894 9320.0 C57
2019-12-25 06:14:23 S 08 42 56.150 +76 54 35.86 V C57
2019-12-25 06:14:23 s 1 +133728.18 5 +70180.352 9870.0 C57
2019-12-25 06:44:23 S 08 42 50.587 +76 55 14.95 V C57
2019-12-25 06:44:23 s 1 +134476.66 6 +73422.339 5350.0 C57
2019-12-25 07:14:23 S 08 42 44.604 +76 55 50.99 V C57
2019-12-25 07:14:23 s 1 +135180.04 9 +76639.789 9580.0 C57
2019-12-25 07:44:23 S 08 42 38.371 +76 56 29.36 V C57
2019-12-25 07:44:23 s 1 +135839.94 6 +79832.671 6210.0 C57
2019-12-25 08:14:23 S 08 42 32.417 +76 57 07.49 V C57
2019-12-25 08:14:23 s 1 +136457.88 9 +83000.985 8720.0 C57
2019-12-25 08:44:23 S 08 42 26.398 +76 57 45.61 V C57
2019-12-25 08:44:23 s 1 +137035.33 9 +86144.758 440.0 C57
2019-12-25 09:14:23 S 08 42 20.335 +76 58 23.27 V C57
2019-12-25 09:14:23 s 1 +137573.68 7 +89264.041 4560.0 C57
2019-12-25 09:44:23 S 08 42 14.268 +76 59 00.85 V C57
2019-12-25 09:44:23 s 1 +138074.26 2 +92358.907 4140.0 C57
2019-12-25 10:14:23 S 08 42 08.100 +76 59 39.84 V 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)