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
2021-04-15 08:27:13 C 14 23 50.50 +34 22 49.5 V G96
2021-04-16 09:36:00 C 14 22 10.13 +34 25 19.8 V T05
2021-04-16 09:45:48 C 14 22 09.47 +34 25 20.6 V T05
2021-04-16 09:52:44 C 14 22 08.99 +34 25 21.4 V T05
2021-04-16 10:26:01 C 14 22 06.71 +34 25 24.3 V T05
2021-04-16 23:04:43 C 14 21 15.86 +34 26 27.1 V 130
2021-04-16 23:06:22 C 14 21 15.74 +34 26 27.1 V 130
2021-04-16 23:08:34 C 14 21 15.59 +34 26 27.4 V 130
2021-04-16 23:10:45 C 14 21 15.45 +34 26 27.5 V 130
2021-04-17 09:35:44 C 14 20 33.47 +34 27 17.2 V T08
2021-04-17 10:22:46 C 14 20 30.23 +34 27 20.8 V T08
2021-04-17 10:34:23 C 14 20 29.43 +34 27 21.6 V T08
2021-04-17 10:39:02 C 14 20 29.11 +34 27 22.0 V T08
2021-04-18 07:57:33 C 14 19 02.73 +34 28 43.2 V 703
2021-04-18 08:05:06 C 14 19 02.20 +34 28 43.7 V 703
2021-04-18 08:12:40 C 14 19 01.68 +34 28 44.2 V 703
2021-04-18 08:20:12 C 14 19 01.16 +34 28 44.6 V 703
2021-04-19 09:59:43 C 14 17 16.75 +34 29 57.5 V T05
2021-04-19 10:02:21 C 14 17 16.56 +34 29 57.6 V T05
2021-04-19 10:06:18 C 14 17 16.29 +34 29 57.8 V T05
2021-04-21 01:22:39 C 14 14 35.24 +34 30 48.9 V 108
2021-04-21 01:25:52 C 14 14 35.00 +34 30 49.1 V 108
2021-04-21 01:28:01 C 14 14 34.87 +34 30 49.0 V 108
2021-04-21 07:29:51 C 14 14 10.22 +34 30 52.3 V 703
2021-04-21 07:37:37 C 14 14 09.66 +34 30 52.6 V 703
2021-04-21 07:45:24 C 14 14 09.15 +34 30 53.0 V 703
2021-04-21 07:53:10 C 14 14 08.62 +34 30 52.6 V 703
2021-04-23 08:34:41 C 14 10 48.33 +34 30 08.0 V T05
2021-04-23 08:37:25 C 14 10 48.13 +34 30 08.1 V T05
2021-04-23 08:45:01 C 14 10 47.60 +34 30 07.8 V T05
2021-04-23 09:22:53 C 14 10 44.94 +34 30 06.7 V T05
2021-04-23 20:30:22 C 14 09 59.17 +34 29 38.3 V K74
2021-04-23 20:32:29 C 14 09 59.01 +34 29 38.2 V K74
2021-04-23 20:36:42 C 14 09 58.72 +34 29 38.2 V K74
2021-04-23 20:40:56 C 14 09 58.44 +34 29 37.8 V K74
2021-04-23 20:47:17 C 14 09 57.98 +34 29 37.7 V K74
2021-04-24 20:52:13 C 14 08 18.75 +34 28 22.3 V 130
2021-04-24 20:54:21 C 14 08 18.57 +34 28 22.6 V 130
2021-04-24 20:57:13 C 14 08 18.43 +34 28 22.1 V 130
2021-04-24 21:00:05 C 14 08 18.19 +34 28 21.9 V 130
2021-04-25 10:43:35 C 14 07 21.48 +34 27 29.2 V T08
2021-04-25 10:48:18 C 14 07 21.16 +34 27 29.1 V T08
2021-04-25 10:57:51 C 14 07 20.50 +34 27 28.4 V T08
2021-04-27 10:10:28 C 14 04 06.589 +34 23 13.12 U F51
2021-04-27 10:26:13 C 14 04 05.489 +34 23 11.43 U F51
2021-04-27 10:43:32 C 14 04 04.285 +34 23 09.56 U F51
2021-04-27 11:01:16 C 14 04 03.042 +34 23 07.57 U F51
2021-04-27 11:04:40 C 14 04 02.81 +34 23 07.2 V T05
2021-04-27 11:09:19 C 14 04 02.49 +34 23 06.8 V T05
2021-04-27 11:57:40 C 14 03 59.11 +34 23 01.2 V T05
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)