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
2024-02-21 03:18:59 C 16 13 46.289 +04 09 55.66 V M22
2024-02-24 13:41:19 C 16 16 02.321 +04 11 42.79 V T05
2024-02-24 13:45:52 C 16 16 02.448 +04 11 42.90 V T05
2024-02-24 13:53:20 C 16 16 02.657 +04 11 42.97 V T05
2024-02-24 14:01:12 C 16 16 02.839 +04 11 43.19 V T05
2024-02-27 07:09:34 C 16 17 40.932 +04 13 54.19 V W68
2024-02-27 07:14:07 C 16 17 41.035 +04 13 54.70 V W68
2024-02-27 07:21:59 C 16 17 41.246 +04 13 54.95 V W68
2024-02-27 07:31:09 C 16 17 41.450 +04 13 55.27 V W68
2024-02-28 14:18:34 C 16 18 24.696 +04 15 04.21 V T05
2024-02-28 14:21:50 C 16 18 24.758 +04 15 04.46 V T05
2024-02-28 14:29:47 C 16 18 24.941 +04 15 04.75 V T05
2024-02-28 14:43:47 C 16 18 25.241 +04 15 05.29 V T05
2024-02-29 01:56:38 C 16 18 40.529 +04 15 37.15 V M22
2024-02-29 02:01:13 C 16 18 40.632 +04 15 37.19 V M22
2024-02-29 02:05:50 C 16 18 40.730 +04 15 37.44 V M22
2024-02-29 02:20:19 C 16 18 41.033 +04 15 38.20 V M22
2024-03-06 01:15:35 C 16 21 30.10 +04 22 57.6 V 088
2024-03-06 01:17:58 C 16 21 30.13 +04 22 57.7 V 088
2024-03-06 01:21:22 C 16 21 30.19 +04 22 58.0 V 088
2024-03-07 16:49:01 C 16 22 08.14 +04 25 26.0 o D54
2024-03-07 17:05:06 C 16 22 08.36 +04 25 25.9 o D54
2024-03-07 17:24:05 C 16 22 08.65 +04 25 26.9 o D54
2024-03-11 06:17:14 B 16 23 16.16 +04 31 23.1 V X18
2024-03-11 06:18:04 B 16 23 16.17 +04 31 23.1 V X18
2024-03-11 06:18:54 B 16 23 16.18 +04 31 23.2 V X18
2024-03-14 07:56:40 C 16 23 58.130 +04 37 00.30 V W68
2024-03-14 07:59:17 C 16 23 58.138 +04 37 00.44 V W68
2024-03-14 08:03:13 C 16 23 58.171 +04 37 00.70 V W68
2024-03-14 08:17:34 C 16 23 58.260 +04 37 01.81 V W68
2024-03-16 02:20:01 C 16 24 14.966 +04 40 25.03 V M22
2024-03-16 02:22:38 C 16 24 14.974 +04 40 25.07 V M22
2024-03-16 02:27:54 C 16 24 14.995 +04 40 25.57 V M22
2024-03-16 02:43:40 C 16 24 15.065 +04 40 26.90 V M22
2024-03-17 10:25:33 C 16 24 24.242 +04 42 59.98 V T08
2024-03-17 10:29:57 C 16 24 24.259 +04 43 00.12 V T08
2024-03-17 10:37:42 C 16 24 24.295 +04 43 00.73 V T08
2024-03-17 11:28:21 C 16 24 24.449 +04 43 05.12 V T08
2024-03-18 08:06:02 C 16 24 28.322 +04 44 53.34 V W68
2024-03-18 08:08:37 C 16 24 28.330 +04 44 53.45 V W68
2024-03-18 08:13:11 C 16 24 28.337 +04 44 53.92 V W68
2024-03-18 08:21:01 C 16 24 28.349 +04 44 54.60 V W68
2024-03-19 12:15:22 C 16 24 31.714 +04 47 13.42 V T05
2024-03-19 12:19:23 C 16 24 31.714 +04 47 13.78 V T05
2024-03-19 12:23:57 C 16 24 31.716 +04 47 14.17 V T05
2024-03-19 12:52:50 C 16 24 31.716 +04 47 16.73 V T05
2024-03-19 12:53:41 C 16 24 31.690 +04 47 16.12 V T05
2024-03-20 01:37:19 C 16 24 32.251 +04 48 26.86 V M22
2024-03-20 01:39:55 C 16 24 32.251 +04 48 26.86 V M22
2024-03-20 01:41:15 C 16 24 32.258 +04 48 27.25 V M22
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)