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
2019-01-25 15:37:21 C 16 29 09.64 -07 25 54.7 V T08
2019-01-25 15:49:09 C 16 29 10.36 -07 25 58.2 V T08
2019-01-27 14:52:43 C 16 32 02.52 -07 40 09.9 V T05
2019-01-27 14:55:56 C 16 32 02.71 -07 40 10.8 V T05
2019-01-27 15:03:38 C 16 32 03.17 -07 40 12.9 V T05
2019-01-27 15:08:58 C 16 32 03.49 -07 40 14.6 V T05
2019-01-27 15:30:33 C 16 32 04.78 -07 40 20.7 V T05
2019-01-27 15:31:53 C 16 32 04.88 -07 40 21.6 V T05
2019-01-27 15:41:17 C 16 32 05.46 -07 40 24.4 V T05
2019-02-06 05:37:24 C 16 46 02.47 -08 48 54.7 c J04
2019-02-06 05:54:14 C 16 46 03.48 -08 48 59.7 c J04
2019-02-06 06:11:04 C 16 46 04.48 -08 49 04.8 c J04
2019-02-06 06:27:54 C 16 46 05.48 -08 49 09.8 c J04
2019-02-16 05:03:54 C 17 00 23.41 -10 00 12.7 q C95
2019-02-16 05:06:34 C 17 00 23.56 -10 00 13.5 q C95
2019-02-16 05:09:12 C 17 00 23.72 -10 00 14.3 q C95
2019-02-16 05:11:51 C 17 00 23.87 -10 00 15.2 q C95
2019-02-16 05:14:29 C 17 00 24.03 -10 00 16.0 q C95
2019-02-16 05:17:07 C 17 00 24.18 -10 00 16.8 q C95
2019-02-22 14:11:39 C 17 09 26.94 -10 46 57.7 V T08
2019-02-22 14:23:07 C 17 09 27.62 -10 47 01.5 V T08
2019-02-22 14:34:30 C 17 09 28.29 -10 47 05.1 V T08
2019-02-26 15:08:31 C 17 15 07.62 -11 17 31.7 V T08
2019-02-26 15:20:48 C 17 15 08.32 -11 17 35.4 V T08
2019-02-26 15:33:04 C 17 15 09.01 -11 17 39.4 V T08
2019-02-26 15:45:09 C 17 15 09.72 -11 17 43.2 V T08
2019-03-14 15:15:02 C 17 37 03.75 -13 32 09.9 V T08
2019-03-14 15:16:32 C 17 37 03.84 -13 32 10.6 V T08
2019-03-14 15:27:53 C 17 37 04.45 -13 32 14.9 V T08
2019-03-14 15:28:33 C 17 37 04.48 -13 32 15.1 V T08
2019-03-14 22:49:46 S 17 37 28.85 -13 35 05.4 L C51
2019-03-15 05:06:35 S 17 37 49.81 -13 37 33.8 L C51
2019-03-15 08:14:54 S 17 38 00.283 -13 38 48.48 L C51
2019-03-15 08:15:05 S 17 38 00.295 -13 38 48.23 L C51
2019-03-15 11:23:24 S 17 38 10.776 -13 40 03.40 L C51
2019-03-15 14:31:54 S 17 38 21.24 -13 41 18.2 L C51
2019-03-15 16:06:09 S 17 38 26.472 -13 41 55.82 L C51
2019-03-15 17:40:13 S 17 38 31.69 -13 42 33.1 L C51
2019-03-15 20:48:43 S 17 38 42.15 -13 43 48.4 L C51
2019-03-15 22:22:59 S 17 38 47.42 -13 44 26.5 L C51
2019-03-16 01:30:33 S 17 38 57.83 -13 45 41.9 L C51
2019-03-23 14:49:44 C 17 48 54.01 -15 04 03.0 V T05
2019-03-23 15:02:20 C 17 48 54.67 -15 04 08.9 V T05
2019-03-23 15:14:54 C 17 48 55.34 -15 04 14.7 V T05
2019-03-23 15:28:54 C 17 48 56.07 -15 04 21.3 V T05
2019-03-31 14:20:18 C 17 59 05.23 -16 42 03.6 V T05
2019-03-31 14:33:39 C 17 59 05.91 -16 42 11.1 V T05
2019-03-31 14:37:37 C 17 59 06.11 -16 42 13.4 V T05
2019-04-04 15:01:06 C 18 04 05.50 -17 39 29.4 V T05
2019-04-04 15:24:16 C 18 04 06.64 -17 39 43.8 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)