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
2024-06-11 21:59:18 C 14 16 41.124 -02 24 43.78 Z C23
2024-06-11 22:05:06 C 14 16 40.682 -02 24 48.24 Z C23
2024-06-12 00:16:03 C 14 16 30.101 -02 26 26.41 Z C23
2024-06-13 07:31:22 C 14 14 03.876 -02 49 59.77 V T08
2024-06-13 07:46:08 C 14 14 02.707 -02 50 11.00 V T08
2024-06-13 07:51:43 C 14 14 02.266 -02 50 15.29 V T08
2024-06-13 08:00:43 C 14 14 01.550 -02 50 22.13 V T08
2024-06-13 11:28:49 C 14 13 45.90 -02 52 52.5 X P14
2024-06-13 11:42:07 C 14 13 44.79 -02 53 03.3 X P14
2024-06-13 11:55:26 C 14 13 43.83 -02 53 14.3 X P14
2024-06-13 19:54:44 C 14 13 07.05 -02 59 30.4 X G02
2024-06-13 20:01:26 C 14 13 06.53 -02 59 35.5 X G02
2024-06-13 20:08:08 C 14 13 06.02 -02 59 40.7 X G02
2024-06-14 11:26:35 C 14 11 57.05 -03 11 14.1 X P14
2024-06-14 11:36:48 C 14 11 56.25 -03 11 22.2 X P14
2024-06-14 11:47:12 C 14 11 55.49 -03 11 29.8 X P14
2024-06-15 07:03:53 C 14 10 29.794 -03 26 30.26 V T05
2024-06-15 07:08:41 C 14 10 29.438 -03 26 34.01 V T05
2024-06-15 07:17:09 C 14 10 28.798 -03 26 40.56 V T05
2024-06-15 07:31:24 C 14 10 27.718 -03 26 51.61 V T05
2024-06-15 11:52:02 C 14 10 08.90 -03 30 06.2 X P14
2024-06-15 12:07:12 C 14 10 07.77 -03 30 18.2 X P14
2024-06-15 12:21:47 C 14 10 06.68 -03 30 29.4 X P14
2024-06-16 20:01:26 C 14 07 50.76 -03 55 22.4 X G02
2024-06-16 20:12:17 C 14 07 49.98 -03 55 31.0 X G02
2024-06-16 20:17:19 C 14 07 49.61 -03 55 35.0 X G02
2024-06-16 21:17:59 B 14 07 45.286 -03 56 22.13 V 160
2024-06-16 21:21:21 B 14 07 45.050 -03 56 24.61 V 160
2024-06-16 21:24:42 B 14 07 44.813 -03 56 27.20 V 160
2024-06-17 21:05:04 B 14 06 06.619 -04 15 04.91 V L92
2024-06-17 21:20:07 B 14 06 05.590 -04 15 17.23 V L92
2024-06-17 21:23:00 B 14 06 05.426 -04 15 20.12 V 160
2024-06-17 21:27:45 B 14 06 05.110 -04 15 23.98 V 160
2024-06-17 21:35:42 B 14 06 04.541 -04 15 29.88 V L92
2024-06-18 19:52:45 C 14 04 34.88 -04 33 11.0 X G02
2024-06-18 19:57:48 C 14 04 34.53 -04 33 15.2 X G02
2024-06-18 20:02:50 C 14 04 34.19 -04 33 19.0 X G02
2024-06-19 11:41:11 C 14 03 32.86 -04 45 36.8 X P14
2024-06-19 11:57:54 C 14 03 31.78 -04 45 50.7 X P14
2024-06-19 12:14:23 C 14 03 30.64 -04 46 03.8 X P14
2024-06-19 21:22:53 C 14 02 55.116 -04 53 32.89 Z C23
2024-06-19 21:25:47 C 14 02 54.938 -04 53 35.05 Z C23
2024-06-19 21:28:40 C 14 02 54.756 -04 53 37.93 Z C23
2024-06-20 04:06:55 C 14 02 29.105 -04 58 46.42 V W68
2024-06-20 04:23:29 C 14 02 28.030 -04 58 59.66 V W68
2024-06-20 04:30:24 C 14 02 27.571 -04 59 05.17 V W68
2024-06-20 05:12:09 C 14 02 24.905 -04 59 38.69 V W68
2024-06-20 20:28:28 C 14 01 27.548 -05 12 05.30 V 089
2024-06-20 20:29:50 C 14 01 27.491 -05 12 06.41 V 089
2024-06-20 20:31:12 C 14 01 27.378 -05 12 07.23 V 089
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)