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
2024-03-20 01:44:31 C 16 24 32.256 +04 48 27.47 V M22
2024-03-20 01:45:49 C 16 24 32.254 +04 48 27.65 V M22
2024-03-20 01:50:22 C 16 24 32.244 +04 48 28.12 V M22
2024-03-20 01:52:20 C 16 24 32.258 +04 48 28.12 V M22
2024-03-20 01:59:33 C 16 24 32.237 +04 48 28.62 V M22
2024-03-21 11:32:18 C 16 24 31.298 +04 51 19.73 V T08
2024-03-21 11:36:27 C 16 24 31.284 +04 51 19.98 V T08
2024-03-21 11:44:12 C 16 24 31.270 +04 51 20.74 V T08
2024-03-21 12:14:45 C 16 24 31.188 +04 51 23.44 V T08
2024-03-22 06:44:23 C 16 24 28.855 +04 53 05.06 V W68
2024-03-22 06:48:56 C 16 24 28.834 +04 53 05.50 V W68
2024-03-22 06:58:47 C 16 24 28.786 +04 53 06.47 V W68
2024-03-23 12:19:13 C 16 24 22.675 +04 55 37.38 V T05
2024-03-23 12:21:50 C 16 24 22.678 +04 55 37.63 V T05
2024-03-23 12:26:23 C 16 24 22.644 +04 55 38.10 V T05
2024-03-23 12:34:51 C 16 24 22.598 +04 55 38.78 V T05
2024-03-24 18:08:08 C 16 24 13.260 +04 58 19.81 V P07
2024-03-24 18:59:37 C 16 24 12.890 +04 58 24.17 V P07
2024-03-24 19:59:58 C 16 24 12.422 +04 58 29.82 V P07
2024-03-24 21:23:35 C 16 24 11.842 +04 58 37.09 V P07
2024-03-25 17:44:39 C 16 24 03.516 +05 00 25.52 V P07
2024-03-25 18:26:27 C 16 24 03.185 +05 00 28.69 V P07
2024-03-25 18:27:36 C 16 24 03.178 +05 00 29.52 V P07
2024-03-25 19:09:56 C 16 24 02.765 +05 00 33.12 V P07
2024-03-25 20:14:12 C 16 24 02.184 +05 00 38.59 V P07
2024-03-25 21:31:51 C 16 24 01.464 +05 00 46.15 V P07
2024-03-25 21:32:07 C 16 24 01.471 +05 00 45.54 V P07
2024-03-27 12:13:12 C 16 23 40.632 +05 04 07.57 V T05
2024-03-27 12:16:28 C 16 23 40.589 +05 04 07.86 V T05
2024-03-27 12:51:27 C 16 23 40.171 +05 04 10.85 V T05
2024-03-27 12:57:27 C 16 23 40.104 +05 04 11.42 V T05
2024-03-30 04:17:10 C 16 22 52.918 +05 09 47.81 V W68
2024-03-30 04:19:55 C 16 22 52.884 +05 09 48.13 V W68
2024-03-30 04:24:28 C 16 22 52.788 +05 09 48.24 V W68
2024-03-30 04:39:53 C 16 22 52.555 +05 09 49.79 V W68
2024-03-31 12:38:10 C 16 22 22.310 +05 12 29.27 V T05
2024-03-31 12:40:46 C 16 22 22.260 +05 12 29.56 V T05
2024-03-31 12:50:55 C 16 22 22.080 +05 12 30.42 V T05
2024-03-31 12:58:28 C 16 22 21.948 +05 12 31.07 V T05
2024-03-31 23:18:06 C 16 22 11.398 +05 13 27.80 V M22
2024-03-31 23:20:42 C 16 22 11.352 +05 13 28.20 V M22
2024-04-01 00:05:27 C 16 22 10.529 +05 13 32.16 V M22
2024-04-01 00:39:30 C 16 22 09.878 +05 13 34.82 V M22
2024-04-01 19:28:49 B 16 21 49.20 +05 15 04.6 Z O53
2024-04-01 20:09:56 B 16 21 48.36 +05 15 07.9 Z O53
2024-04-01 20:54:58 B 16 21 47.42 +05 15 11.8 Z O53
2024-04-02 17:51:07 B 16 21 22.76 +05 16 54.4 Z O53
2024-04-02 18:53:48 B 16 21 21.38 +05 16 59.5 Z O53
2024-04-02 20:05:22 B 16 21 19.81 +05 17 05.3 Z O53
2024-04-03 18:52:35 B 16 20 50.41 +05 18 54.3 Z O53
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)