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
2024-05-19 20:47:45 C 15 08 20.61 +03 14 03.1 X G02
2024-05-19 20:54:10 C 15 08 19.96 +03 14 00.2 X G02
2024-05-19 21:00:19 C 15 08 19.34 +03 13 57.5 X G02
2024-05-19 21:01:16 C 15 08 19.157 +03 13 57.12 V 089
2024-05-19 21:03:38 C 15 08 18.937 +03 13 56.43 V 089
2024-05-19 21:06:00 C 15 08 18.703 +03 13 55.74 V 089
2024-05-19 21:08:22 C 15 08 18.437 +03 13 54.16 V 089
2024-05-19 21:10:44 C 15 08 18.229 +03 13 53.30 V 089
2024-05-19 21:13:06 C 15 08 17.972 +03 13 51.97 V 089
2024-05-20 17:58:15 C 15 06 14.634 +03 04 37.29 O18
2024-05-20 17:59:43 C 15 06 14.483 +03 04 36.70 O18
2024-05-20 21:33:46 C 15 05 53.44 +03 02 58.1 V G34
2024-05-20 21:36:38 C 15 05 53.16 +03 02 56.8 V G34
2024-05-20 21:39:31 C 15 05 52.87 +03 02 55.5 V G34
2024-05-20 21:42:22 C 15 05 52.59 +03 02 54.0 V G34
2024-05-21 17:40:44 C 15 03 53.550 +02 53 39.56 O18
2024-05-21 17:42:13 C 15 03 53.403 +02 53 39.02 O18
2024-05-24 09:58:10 C 14 57 30.374 +02 21 58.86 V T08
2024-05-24 10:20:34 C 14 57 28.104 +02 21 47.38 V T08
2024-05-24 10:24:50 C 14 57 27.672 +02 21 45.11 V T08
2024-05-24 10:34:11 C 14 57 26.722 +02 21 40.25 V T08
2024-05-25 16:57:48 C 14 54 26.091 +02 05 37.94 O18
2024-05-25 17:58:50 C 14 54 19.931 +02 05 05.00 O18
2024-05-25 18:00:17 C 14 54 19.797 +02 05 04.18 O18
2024-05-25 22:34:30 C 14 53 52.648 +02 02 35.52 V 089
2024-05-25 22:44:31 C 14 53 51.641 +02 02 30.11 V 089
2024-05-25 22:54:31 C 14 53 50.643 +02 02 24.65 V 089
2024-05-25 22:55:53 C 14 53 50.503 +02 02 23.87 V 089
2024-05-25 23:05:27 C 14 53 49.542 +02 02 18.78 V 089
2024-05-25 23:06:49 C 14 53 49.407 +02 02 18.09 V 089
2024-05-25 23:15:28 C 14 53 48.555 +02 02 13.37 V 089
2024-05-25 23:16:50 C 14 53 48.416 +02 02 12.68 V 089
2024-05-25 23:18:12 C 14 53 48.263 +02 02 11.90 V 089
2024-05-25 23:25:28 C 14 53 47.551 +02 02 07.95 V 089
2024-05-26 07:57:31 C 14 52 56.968 +01 57 31.28 V 703
2024-05-26 08:00:47 C 14 52 56.644 +01 57 29.27 V 703
2024-05-26 08:04:04 C 14 52 56.320 +01 57 27.54 V 703
2024-05-26 08:07:20 C 14 52 55.985 +01 57 25.99 V 703
2024-05-26 09:20:56 C 14 52 48.929 +01 56 47.18 V T05
2024-05-26 09:25:30 C 14 52 48.470 +01 56 44.70 V T05
2024-05-26 09:36:52 C 14 52 47.323 +01 56 38.47 V T05
2024-05-26 09:52:43 C 14 52 45.722 +01 56 29.76 V T05
2024-05-26 19:49:40 C 14 51 47.09 +01 50 57.4 X G02
2024-05-26 19:55:20 C 14 51 46.52 +01 50 54.3 X G02
2024-05-26 20:00:48 C 14 51 45.97 +01 50 51.2 X G02
2024-05-26 22:04:53 C 14 51 33.518 +01 49 53.11 V M22
2024-05-26 22:09:09 C 14 51 33.086 +01 49 50.77 V M22
2024-05-26 22:17:46 C 14 51 32.218 +01 49 45.95 V M22
2024-05-26 22:32:23 C 14 51 30.754 +01 49 37.88 V M22
2024-05-27 19:33:21 C 14 49 27.11 +01 37 37.1 X G02
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)