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
1999-01-16 11:19:13 C 01 22 22.31 +36 48 30.9 m 347
1999-01-16 11:24:00 C 01 22 22.75 +36 48 37.5 m 347
1999-01-16 20:35:01 C 01 23 15.07 +37 01 18.2 z 151
1999-01-16 20:45:23 C 01 23 16.04 +37 01 32.3 z 151
1999-01-17 17:33:59 C 01 25 15.05 +37 29 45.0 557
1999-01-17 18:18:51 C 01 25 19.22 +37 30 44.5 557
1999-01-17 18:57:50 C 01 25 22.85 +37 31 36.1 557
1999-01-19 18:33:49 C 01 29 55.60 +38 32 55.7 a 639
1999-01-19 19:20:51 C 01 30 00.13 +38 33 53.2 a 639
1999-01-20 19:35:32 C 01 32 19.74 +39 03 35.6 14.4 m 026
1999-01-21 17:45:04 C 01 34 28.17 +39 29 53.5 z 151
1999-01-21 17:56:15 C 01 34 29.21 +39 30 07.0 z 151
1999-01-21 19:01:48 C 01 34 35.38 +39 31 22.4 a 113
1999-01-21 19:04:48 C 01 34 35.67 +39 31 25.9 a 113
1999-01-21 19:07:47 C 01 34 35.94 +39 31 29.4 a 113
1999-01-21 19:10:48 C 01 34 36.23 +39 31 32.9 a 113
1999-01-21 19:13:47 C 01 34 36.51 +39 31 36.3 a 113
1999-01-21 19:37:29 C 01 34 38.77 +39 32 04.2 14.4 m 026
1999-01-23 22:28:10 C 01 39 34.60 +40 29 24.2 14.5 m 026
1999-01-23 22:57:12 C 01 39 37.42 +40 29 55.4 14.6 m 026
1999-01-30 02:45:46 C 01 54 14.15 +42 57 23.7 z 294
1999-01-30 03:21:29 C 01 54 17.79 +42 57 55.7 z 294
1999-01-31 18:24:10 C 01 58 14.12 +43 32 44.5 z 151
1999-01-31 18:37:24 C 01 58 15.40 +43 32 55.9 z 151
1999-02-05 03:22:39 C 02 08 58.22 +44 58 56.2 z 294
1999-02-05 04:01:56 C 02 09 02.37 +44 59 28.0 z 294
1999-02-08 03:09:29 C 02 16 27.38 +45 52 34.3 16.9 a 704
1999-02-08 03:25:20 C 02 16 28.99 +45 52 45.4 a 704
1999-02-08 03:41:39 C 02 16 30.74 +45 52 56.3 a 704
1999-02-08 03:58:03 C 02 16 32.50 +45 53 07.6 a 704
1999-02-08 04:14:01 C 02 16 34.06 +45 53 19.2 a 704
1999-02-10 00:49:00 C 02 21 17.06 +46 24 34.9 c 746
1999-02-10 00:59:30 C 02 21 18.16 +46 24 42.1 c 746
1999-02-10 01:07:30 C 02 21 19.01 +46 24 47.4 c 746
1999-02-10 18:05:17 C 02 23 07.49 +46 36 17.1 557
1999-02-10 19:23:36 C 02 23 15.73 +46 37 09.0 557
1999-02-10 20:19:28 C 02 23 21.63 +46 37 45.9 557
1999-02-13 18:13:07 C 02 30 53.14 +47 23 04.5 15.1 947
1999-02-13 20:16:34 C 02 31 06.31 +47 24 20.1 15.1 947
1999-03-11 17:58:06 C 03 43 12.02 +52 11 58.6 118
1999-03-11 18:03:34 C 03 43 12.65 +52 12 00.6 118
1999-03-13 19:05:00 C 03 49 15.36 +52 27 22.7 z 151
1999-03-13 19:11:54 C 03 49 16.18 +52 27 24.8 z 151
1999-03-13 19:16:50 C 03 49 16.80 +52 27 26.6 z 151
1999-03-21 02:54:27 C 04 11 17.81 +53 14 55.5 z 719
1999-03-21 03:08:45 C 04 11 19.50 +53 14 59.0 z 719
1999-03-24 22:42:15 C 04 23 00.20 +53 35 06.9 17.1 m 026
1999-03-24 22:44:24 C 04 23 00.51 +53 35 07.2 16.9 m 026
1999-03-25 19:19:05 C 04 25 38.90 +53 39 15.8 118
1999-03-25 19:31:54 C 04 25 40.53 +53 39 18.7 118
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)