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
2016-07-06 02:32:54 C 13 32 08.84 +07 47 45.2 u H21
2016-07-06 02:35:25 C 13 32 08.84 +07 47 43.3 u H21
2016-07-06 02:37:57 C 13 32 08.82 +07 47 41.4 u H21
2016-07-06 03:57:39 C 13 32 08.50 +07 46 39.6 R G45
2016-07-06 04:05:04 C 13 32 08.46 +07 46 33.9 R G45
2016-07-06 04:12:24 C 13 32 08.42 +07 46 28.4 R G45
2016-07-06 04:19:43 C 13 32 08.38 +07 46 22.4 R G45
2016-07-06 04:26:53 C 13 32 08.34 +07 46 17.0 R G45
2016-07-08 04:18:32 C 13 32 00.25 +07 08 55.9 463
2016-07-08 04:38:59 C 13 32 00.28 +07 08 39.0 463
2016-07-08 05:00:55 C 13 32 00.25 +07 08 22.9 463
2016-07-09 06:30:58 C 13 31 58.98 +06 48 26.7 L T05
2016-07-09 06:48:33 C 13 31 58.97 +06 48 12.4 L T05
2016-07-09 07:09:07 C 13 31 58.94 +06 47 56.5 L T05
2016-07-09 07:28:05 C 13 31 58.92 +06 47 41.6 L T05
2016-07-10 02:18:11 C 13 31 59.32 +06 32 54.3 q H21
2016-07-10 02:21:42 C 13 31 59.33 +06 32 51.6 q H21
2016-07-10 02:25:12 C 13 31 59.32 +06 32 48.9 q H21
2016-07-10 02:28:44 C 13 31 59.33 +06 32 46.0 q H21
2016-07-10 02:32:14 C 13 31 59.33 +06 32 43.5 q H21
2016-07-11 03:57:54 C 13 32 01.56 +06 12 46.1 q 719
2016-07-11 04:11:30 C 13 32 01.66 +06 12 33.8 q 719
2016-07-12 03:30:55 C 13 32 05.34 +05 54 15.3 v 719
2016-07-12 04:45:54 C 13 32 05.55 +05 53 15.9 v 719
2016-07-13 20:03:02 C 13 32 15.70 +05 22 17.8 q 160
2016-07-13 20:05:29 C 13 32 15.70 +05 22 15.9 q 160
2016-07-13 20:07:57 C 13 32 15.69 +05 22 14.1 q 160
2016-07-15 03:47:32 C 13 32 27.07 +04 57 14.1 463
2016-07-15 04:18:32 C 13 32 27.23 +04 56 50.0 463
2016-07-16 04:06:52 C 13 32 37.78 +04 38 03.8 q G96
2016-07-16 04:13:42 C 13 32 37.83 +04 37 58.5 q G96
2016-07-16 04:20:33 C 13 32 37.87 +04 37 53.0 q G96
2016-07-16 04:27:23 C 13 32 37.92 +04 37 47.6 q G96
2016-07-17 19:53:21 C 13 32 58.80 +04 06 36.3 q 160
2016-07-17 19:55:48 C 13 32 58.81 +04 06 34.0 q 160
2016-07-17 19:58:09 C 13 32 58.85 +04 06 31.9 q 160
2016-07-19 20:07:43 C 13 33 30.03 +03 28 23.8 q 160
2016-07-19 20:10:15 C 13 33 30.06 +03 28 21.8 q 160
2016-07-19 20:12:45 C 13 33 30.11 +03 28 19.9 q 160
2016-07-20 20:17:57 C 13 33 48.01 +03 09 13.8 q 160
2016-07-20 20:19:53 C 13 33 48.07 +03 09 12.8 q 160
2016-07-20 20:21:51 C 13 33 48.06 +03 09 10.8 q 160
2016-07-26 12:25:30 C 13 35 57.37 +01 21 08.4 q D29
2016-07-26 12:45:51 C 13 35 57.74 +01 20 52.1 q D29
2016-07-26 13:06:13 C 13 35 58.10 +01 20 35.8 q D29
2016-07-27 03:30:15 C 13 36 14.58 +01 09 08.3 463
2016-07-27 04:00:38 C 13 36 15.20 +01 08 44.2 463
2016-07-27 12:42:12 C 13 36 25.30 +01 01 49.6 q D29
2016-07-27 13:02:34 C 13 36 25.69 +01 01 33.4 q D29
2016-07-27 13:22:56 C 13 36 26.07 +01 01 17.1 q D29
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)