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
2020-12-24 15:35:11 C 14 30 42.80 +21 51 36.6 V T05
2020-12-24 15:46:29 C 14 30 43.32 +21 51 36.9 V T05
2021-01-04 12:06:12 C 14 41 54.15 +22 03 55.3 V 703
2021-01-04 12:14:01 C 14 41 54.46 +22 03 56.6 V 703
2021-01-04 12:21:49 C 14 41 54.76 +22 03 57.5 V 703
2021-01-04 12:29:37 C 14 41 55.11 +22 03 57.8 V 703
2021-01-07 15:32:06 C 14 44 53.35 +22 11 09.4 V T08
2021-01-07 15:37:56 C 14 44 53.57 +22 11 10.1 V T08
2021-01-07 15:45:52 C 14 44 53.88 +22 11 10.6 V T08
2021-01-07 16:04:19 C 14 44 54.59 +22 11 12.9 V T08
2021-01-08 21:08:18 C 14 46 01.58 +22 14 26.1 q D29
2021-01-08 21:26:08 C 14 46 02.25 +22 14 28.2 q D29
2021-01-08 21:43:56 C 14 46 02.92 +22 14 30.2 q D29
2021-01-14 11:07:07 C 14 50 54.75 +22 32 34.5 V 703
2021-01-14 11:14:42 C 14 50 55.04 +22 32 36.0 V 703
2021-01-14 11:22:17 C 14 50 55.27 +22 32 36.5 V 703
2021-01-14 11:29:51 C 14 50 55.54 +22 32 38.0 V 703
2021-01-17 14:15:26 C 14 53 27.06 +22 45 06.9 V T05
2021-01-17 14:20:04 C 14 53 27.21 +22 45 07.8 V T05
2021-01-17 14:30:01 C 14 53 27.54 +22 45 09.5 V T05
2021-01-17 14:44:33 C 14 53 27.99 +22 45 12.3 V T05
2021-01-18 11:38:17 C 14 54 08.67 +22 48 58.8 V 703
2021-01-18 11:45:49 C 14 54 08.90 +22 49 00.2 V 703
2021-01-18 11:53:22 C 14 54 09.15 +22 49 01.7 V 703
2021-01-18 12:00:54 C 14 54 09.36 +22 49 02.8 V 703
2021-01-22 14:59:53 C 14 57 11.827 +23 08 46.54 U F52
2021-01-22 15:14:01 C 14 57 12.227 +23 08 49.60 U F52
2021-01-22 15:28:12 C 14 57 12.628 +23 08 52.68 U F52
2021-01-22 15:42:34 C 14 57 13.035 +23 08 55.76 U F52
2021-02-05 11:12:29 C 15 05 05.44 +24 35 51.0 V 703
2021-02-05 11:34:42 C 15 05 05.82 +24 35 58.1 V 703
2021-02-05 11:42:39 C 15 05 05.95 +24 36 00.4 V 703
2021-02-05 11:50:35 C 15 05 06.08 +24 36 02.9 V 703
2021-02-06 14:48:09 C 15 05 33.95 +24 44 30.3 V T05
2021-02-06 14:52:46 C 15 05 34.03 +24 44 31.6 V T05
2021-02-06 15:00:45 C 15 05 34.15 +24 44 34.1 V T05
2021-02-06 15:08:47 C 15 05 34.27 +24 44 36.7 V T05
2021-02-10 13:47:42 C 15 06 57.91 +25 15 48.4 V T05
2021-02-10 13:54:57 C 15 06 58.00 +25 15 50.8 V T05
2021-02-10 14:00:14 C 15 06 58.04 +25 15 52.7 V T05
2021-02-10 14:16:05 C 15 06 58.26 +25 15 58.4 V T05
2021-02-16 13:25:10 C 15 08 19.87 +26 07 24.5 V T08
2021-02-16 13:35:23 C 15 08 19.94 +26 07 28.2 V T08
2021-02-16 13:38:46 C 15 08 19.95 +26 07 29.6 V T08
2021-02-18 12:27:20 C 15 08 34.08 +26 25 18.4 V G96
2021-02-18 12:36:24 C 15 08 34.10 +26 25 21.9 V G96
2021-02-18 12:45:28 C 15 08 34.13 +26 25 25.4 V G96
2021-02-18 12:54:31 C 15 08 34.16 +26 25 28.9 V G96
2021-02-22 13:49:57 C 15 08 43.07 +27 03 46.1 V T05
2021-02-22 13:52:35 C 15 08 43.06 +27 03 47.2 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)