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
2018-04-24 10:57:06 C 12 33 03.13 +51 34 44.8 U T05
2018-04-25 04:22:36 C 12 32 01.96 +51 27 55.7 U I41
2018-04-25 04:43:11 C 12 32 00.73 +51 27 47.7 U I41
2018-04-25 04:43:51 C 12 32 00.70 +51 27 47.5 U I41
2018-04-25 04:45:09 C 12 32 00.62 +51 27 46.9 U I41
2018-04-25 04:45:50 C 12 32 00.58 +51 27 46.7 U I41
2018-04-26 07:05:06 C 12 30 29.65 +51 17 08.7 U G96
2018-04-26 07:13:18 C 12 30 29.25 +51 17 05.5 U G96
2018-04-26 07:21:32 C 12 30 28.73 +51 17 02.5 U G96
2018-04-26 07:29:46 C 12 30 28.24 +51 16 59.1 U G96
2018-04-26 15:31:36 C 12 30 01.17 +51 13 39.6 q D29
2018-04-26 15:50:24 C 12 30 00.10 +51 13 32.4 q D29
2018-04-26 16:09:10 C 12 29 59.02 +51 13 23.8 q D29
2018-04-29 01:22:41 C 12 26 53.37 +50 48 40.1 U W34
2018-04-29 01:40:34 C 12 26 52.44 +50 48 32.2 U W34
2018-04-29 01:54:13 C 12 26 51.68 +50 48 26.1 U W34
2018-04-29 20:48:08 C 12 25 53.02 +50 39 51.9 U K87
2018-04-29 20:56:15 C 12 25 52.59 +50 39 48.3 U K87
2018-04-29 21:04:21 C 12 25 52.17 +50 39 44.8 U K87
2018-05-02 17:03:59 C 12 22 33.36 +50 07 30.7 q C97
2018-05-02 17:06:23 C 12 22 33.25 +50 07 29.8 q C97
2018-05-02 17:08:47 C 12 22 33.12 +50 07 28.2 q C97
2018-05-02 17:11:11 C 12 22 33.01 +50 07 27.4 q C97
2018-05-03 06:21:12 C 12 21 56.50 +50 00 56.1 U 703
2018-05-03 06:28:57 C 12 21 56.17 +50 00 52.2 U 703
2018-05-03 06:36:43 C 12 21 55.77 +50 00 48.4 U 703
2018-05-03 06:44:28 C 12 21 55.42 +50 00 44.4 U 703
2018-05-04 05:55:14 C 12 20 53.19 +49 49 06.2 U G96
2018-05-04 06:02:45 C 12 20 52.85 +49 49 02.4 U G96
2018-05-04 06:10:16 C 12 20 52.53 +49 48 58.5 U G96
2018-05-04 06:17:47 C 12 20 52.17 +49 48 54.7 U G96
2018-05-06 06:26:47 C 12 18 49.78 +49 23 58.4 U 703
2018-05-06 06:34:31 C 12 18 49.46 +49 23 54.2 U 703
2018-05-06 06:42:15 C 12 18 49.11 +49 23 50.0 U 703
2018-05-06 06:49:59 C 12 18 48.74 +49 23 44.8 U 703
2018-05-08 16:19:14 C 12 16 35.28 +48 52 45.5 q C97
2018-05-08 16:21:39 C 12 16 35.16 +48 52 44.8 q C97
2018-05-08 16:24:03 C 12 16 35.09 +48 52 43.0 q C97
2018-05-08 16:26:25 C 12 16 35.03 +48 52 41.4 q C97
2018-05-09 06:07:00 C 12 16 04.93 +48 45 07.2 U 703
2018-05-09 06:14:45 C 12 16 04.65 +48 45 02.6 U 703
2018-05-09 06:22:31 C 12 16 04.36 +48 44 58.5 U 703
2018-05-09 06:30:16 C 12 16 04.09 +48 44 54.1 U 703
2018-05-10 09:14:11 C 12 15 07.93 +48 29 55.7 U T05
2018-05-10 09:19:27 C 12 15 07.73 +48 29 52.7 U T05
2018-05-10 09:21:25 C 12 15 07.66 +48 29 51.7 U T05
2018-05-10 09:40:20 C 12 15 06.99 +48 29 40.8 U T05
2018-05-12 08:52:36 C 12 13 34.90 +48 02 37.4 U T08
2018-05-12 09:13:21 C 12 13 34.20 +48 02 25.0 U T08
2018-05-12 09:22:40 C 12 13 33.87 +48 02 19.4 U 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)