IAA RAS IAA Minor Planet Database

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
2021-06-02 05:42:38 C 13 17 59.08 +28 46 31.3 – V 703
2021-06-02 05:50:11 C 13 17 58.84 +28 46 26.8 – V 703
2021-06-02 05:54:36 C 13 17 58.73 +28 46 23.7 – V 703
2021-06-02 05:57:44 C 13 17 58.58 +28 46 22.1 – V 703
2021-06-02 07:49:12 C 13 17 55.08 +28 45 15.3 – V T05
2021-06-02 07:53:11 C 13 17 54.95 +28 45 12.8 – V T05
2021-06-02 08:06:40 C 13 17 54.50 +28 45 04.7 – V T05
2021-06-02 08:34:55 C 13 17 53.56 +28 44 47.3 – V T05
2021-06-03 18:38:37 S 13 16 50.12 +28 23 50.9 – L C51
2021-06-03 20:21:10 C 13 16 46.94 +28 22 47.1 – V L92
2021-06-03 20:36:02 C 13 16 46.46 +28 22 37.2 – V L92
2021-06-03 20:51:57 C 13 16 45.97 +28 22 28.1 – V L92
2021-06-03 21:46:44 S 13 16 44.46 +28 21 55.0 – L C51
2021-06-03 21:46:55 S 13 16 44.46 +28 21 54.7 – L C51
2021-06-03 23:21:00 S 13 16 41.60 +28 20 56.3 – L C51
2021-06-04 02:28:24 S 13 16 36.09 +28 18 59.5 – L C51
2021-06-04 05:19:23 C 13 16 30.89 +28 17 14.6 – V 703
2021-06-04 05:26:57 C 13 16 30.59 +28 17 08.4 – V 703
2021-06-04 05:34:31 C 13 16 30.38 +28 17 03.6 – V 703
2021-06-04 05:42:05 C 13 16 30.13 +28 16 59.0 – V 703
2021-06-04 08:36:57 C 13 16 24.99 +28 15 10.9 – V T08
2021-06-04 08:41:42 C 13 16 24.84 +28 15 07.8 – V T08
2021-06-04 09:03:47 C 13 16 24.17 +28 14 54.0 – V T08
2021-06-04 09:44:55 C 13 16 22.92 +28 14 28.1 – V T08
2021-06-06 08:50:40 C 13 15 03.88 +27 44 45.5 – V T05
2021-06-06 09:40:12 C 13 15 02.52 +27 44 13.6 – V T05
2021-06-06 09:59:01 C 13 15 02.00 +27 44 01.5 – V T05
2021-06-08 07:47:37 C 13 13 52.52 +27 14 32.3 – V T08
2021-06-08 07:52:18 C 13 13 52.39 +27 14 29.2 – V T08
2021-06-08 08:01:36 C 13 13 52.16 +27 14 23.1 – V T08
2021-06-08 08:18:29 C 13 13 51.75 +27 14 12.1 – V T08
2021-06-09 05:49:51 C 13 13 21.47 +27 00 08.3 – V 703
2021-06-09 05:58:07 C 13 13 21.27 +27 00 03.0 – V 703
2021-06-09 06:06:23 C 13 13 21.07 +26 59 57.4 – V 703
2021-06-09 06:14:39 C 13 13 20.89 +26 59 51.8 – V 703
2021-06-09 22:34:36 C 13 12 58.98 +26 49 07.4 – V L63
2021-06-09 22:44:28 C 13 12 58.72 +26 49 00.6 – V L63
2021-06-09 22:53:49 C 13 12 58.51 +26 48 54.9 – V L63
2021-06-12 07:22:07 C 13 11 49.68 +26 11 22.5 – V T08
2021-06-12 07:32:20 C 13 11 49.46 +26 11 15.6 – V T08
2021-06-12 07:36:23 C 13 11 49.38 +26 11 12.9 – V T08
2021-06-12 07:53:10 C 13 11 49.04 +26 11 01.5 – V T08
2021-06-13 05:24:44 C 13 11 25.50 +25 56 30.7 – V 703
2021-06-13 05:32:57 C 13 11 25.34 +25 56 25.2 – V 703
2021-06-13 05:41:10 C 13 11 25.20 +25 56 19.6 – V 703
2021-06-13 05:49:23 C 13 11 25.05 +25 56 14.0 – V 703
2021-06-16 05:23:30 C 13 10 17.55 +25 07 25.4 – V G96
2021-06-16 05:30:55 C 13 10 17.43 +25 07 20.2 – V G96
2021-06-16 05:45:46 C 13 10 17.22 +25 07 09.9 – V G96
2021-06-16 07:01:57 C 13 10 16.25 +25 06 18.9 – V 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)