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
2021-06-16 07:06:36 C 13 10 16.18 +25 06 15.7 V T08
2021-06-16 07:19:49 C 13 10 15.98 +25 06 06.4 V T08
2021-06-16 07:36:29 C 13 10 15.74 +25 05 55.0 V T08
2021-06-18 06:28:45 C 13 09 40.57 +24 33 28.9 V T05
2021-06-18 06:37:29 C 13 09 40.47 +24 33 23.0 V T05
2021-06-18 06:50:49 C 13 09 40.30 +24 33 13.7 V T05
2021-06-18 06:55:35 C 13 09 40.26 +24 33 10.3 V T05
2021-06-20 08:33:42 C 13 09 10.14 +23 58 29.2 V T08
2021-06-20 08:38:22 C 13 09 10.10 +23 58 26.0 V T08
2021-06-20 08:46:22 C 13 09 10.01 +23 58 20.2 V T08
2021-06-20 09:01:39 C 13 09 09.90 +23 58 09.5 V T08
2021-06-21 03:47:51 C 13 09 00.59 +23 44 57.3 V V06
2021-06-21 03:49:02 C 13 09 00.59 +23 44 56.5 V V06
2021-06-21 03:51:10 C 13 09 00.57 +23 44 55.0 V V06
2021-06-21 03:52:18 C 13 09 00.55 +23 44 54.3 V V06
2021-06-22 07:44:15 C 13 08 48.46 +23 25 14.7 V T05
2021-06-22 07:48:52 C 13 08 48.40 +23 25 11.8 V T05
2021-06-22 07:58:05 C 13 08 48.34 +23 25 05.2 V T05
2021-06-22 08:18:35 C 13 08 48.20 +23 24 50.5 V T05
2021-06-24 06:42:00 C 13 08 33.17 +22 51 56.4 V T08
2021-06-24 06:46:48 C 13 08 33.14 +22 51 53.0 V T08
2021-06-24 06:54:12 C 13 08 33.12 +22 51 47.8 V T08
2021-06-24 07:11:17 C 13 08 33.02 +22 51 35.5 V T08
2021-06-26 06:31:32 C 13 08 23.90 +22 17 48.4 V T05
2021-06-26 06:36:08 C 13 08 23.89 +22 17 45.1 V T05
2021-06-26 06:50:40 C 13 08 23.86 +22 17 34.7 V T05
2021-06-26 07:11:45 C 13 08 23.79 +22 17 19.6 V T05
2021-06-28 07:14:07 C 13 08 20.81 +21 42 51.6 V T08
2021-06-28 07:18:07 C 13 08 20.81 +21 42 48.8 V T08
2021-06-28 07:26:07 C 13 08 20.81 +21 42 42.9 V T08
2021-06-28 07:44:52 C 13 08 20.79 +21 42 29.4 V T08
2021-07-02 07:32:17 C 13 08 33.11 +20 33 19.8 V T08
2021-07-02 07:38:55 C 13 08 33.12 +20 33 14.9 V T08
2021-07-02 08:12:08 C 13 08 33.24 +20 32 50.6 V T08
2021-07-06 07:05:38 C 13 09 08.36 +19 23 55.1 V T08
2021-07-06 07:13:37 C 13 09 08.41 +19 23 49.2 V T08
2021-07-06 07:18:16 C 13 09 08.45 +19 23 45.8 V T08
2021-07-06 07:35:37 C 13 09 08.57 +19 23 33.1 V T08
2021-07-08 06:56:10 C 13 09 34.24 +18 49 03.2 V T05
2021-07-08 07:00:50 C 13 09 34.27 +18 48 59.9 V T05
2021-07-08 07:08:48 C 13 09 34.36 +18 48 54.1 V T05
2021-07-08 07:25:58 C 13 09 34.51 +18 48 41.4 V T05
2021-07-10 06:00:03 C 13 10 04.89 +18 14 42.8 V T08
2021-07-10 06:04:42 C 13 10 04.94 +18 14 39.4 V T08
2021-07-10 06:32:41 C 13 10 05.25 +18 14 19.0 V T08
2021-07-10 06:44:50 C 13 10 05.38 +18 14 10.1 V T08
2021-07-14 06:00:00 C 13 11 22.58 +17 04 35.2 V T08
2021-07-14 06:22:56 C 13 11 22.91 +17 04 18.4 V T08
2021-07-14 06:27:34 C 13 11 22.96 +17 04 15.2 V T08
2021-07-14 06:39:32 C 13 11 23.15 +17 04 06.3 V T08
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)