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
2026-03-20 22:56:11 B 14 15 57.238 +43 05 47.33 X Y84
2026-03-20 22:58:54 B 14 15 57.098 +43 05 48.30 X Y84
2026-03-20 23:27:34 C 14 15 55.524 +43 05 58.92 Z C23
2026-03-21 00:29:05 C 14 15 52.085 +43 06 21.17 Z C23
2026-03-21 22:55:08 B 14 14 38.818 +43 14 28.61 X Y84
2026-03-21 22:57:52 B 14 14 38.659 +43 14 29.47 X Y84
2026-03-21 23:00:34 B 14 14 38.489 +43 14 30.34 X Y84
2026-03-22 21:06:00 C 14 13 24.624 +43 22 14.84 Z C23
2026-03-22 22:18:58 C 14 13 20.506 +43 22 39.86 Z C23
2026-03-25 08:29:25 C 14 09 58.295 +43 41 44.56 V G96
2026-03-25 08:30:08 C 14 09 58.248 +43 41 44.81 V G96
2026-03-25 08:36:52 C 14 09 57.841 +43 41 46.90 V G96
2026-03-25 08:37:35 C 14 09 57.794 +43 41 47.08 V G96
2026-03-25 08:44:20 C 14 09 57.388 +43 41 49.27 V G96
2026-03-25 08:45:02 C 14 09 57.344 +43 41 49.42 V G96
2026-03-25 08:51:47 C 14 09 56.880 +43 41 51.58 V G96
2026-03-25 08:52:29 C 14 09 56.891 +43 41 51.76 V G96
2026-03-25 09:50:31 C 14 09 53.640 +43 42 10.12 V T05
2026-03-25 09:53:08 C 14 09 53.486 +43 42 10.87 V T05
2026-03-25 10:21:26 C 14 09 51.761 +43 42 19.80 V T05
2026-03-25 10:42:35 C 14 09 50.474 +43 42 26.57 V T05
2026-03-26 09:48:23 C 14 08 27.379 +43 49 25.75 V T08
2026-03-26 10:12:15 C 14 08 25.918 +43 49 32.95 V T08
2026-03-26 10:15:36 C 14 08 25.718 +43 49 33.74 V T08
2026-03-26 10:20:56 C 14 08 25.373 +43 49 35.40 V T08
2026-03-28 09:48:55 C 14 05 29.916 +44 02 54.89 V T08
2026-03-28 09:52:57 C 14 05 29.688 +44 02 55.93 V T08
2026-03-28 10:02:15 C 14 05 29.071 +44 02 58.20 V T08
2026-03-28 10:22:01 C 14 05 27.823 +44 03 03.82 V T08
2026-03-29 19:40:42 B 14 03 21.298 +44 11 29.65 W G34
2026-03-29 19:52:18 B 14 03 20.591 +44 11 32.53 W G34
2026-03-29 19:58:36 B 14 03 20.173 +44 11 34.17 W G34
2026-03-31 00:56:26 B 14 01 27.845 +44 18 22.07 X Y84
2026-03-31 01:01:22 B 14 01 27.504 +44 18 23.11 X Y84
2026-03-31 01:06:13 B 14 01 27.163 +44 18 24.23 X Y84
2026-03-31 10:34:22 C 14 00 50.184 +44 20 31.60 V T05
2026-03-31 11:06:22 C 14 00 48.053 +44 20 38.76 V T05
2026-03-31 11:09:01 C 14 00 47.873 +44 20 39.12 V T05
2026-03-31 11:21:35 C 14 00 47.028 +44 20 42.04 V T05
2026-04-01 09:55:55 C 13 59 18.026 +44 25 25.39 V T08
2026-04-01 10:01:11 C 13 59 17.657 +44 25 26.69 V T08
2026-04-01 10:11:42 C 13 59 16.949 +44 25 28.88 V T08
2026-04-01 10:47:34 C 13 59 14.520 +44 25 36.26 V T08
2026-04-04 10:24:33 C 13 54 25.442 +44 38 11.51 V T08
2026-04-04 10:58:32 C 13 54 23.076 +44 38 16.66 V T08
2026-04-04 11:02:29 C 13 54 22.798 +44 38 17.12 V T08
2026-04-04 11:10:23 C 13 54 22.258 +44 38 18.46 V T08
2026-04-05 10:46:22 C 13 52 45.240 +44 41 37.79 V T05
2026-04-05 11:21:10 C 13 52 42.785 +44 41 42.47 V T05
2026-04-05 11:25:45 C 13 52 42.470 +44 41 43.01 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)