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
2020-05-11 07:24:26 C 08 13 59.48 +57 34 19.0 – V T05
2020-05-13 05:43:09 C 08 18 27.34 +57 11 13.9 – V T08
2020-05-13 05:47:49 C 08 18 27.73 +57 11 11.5 – V T08
2020-05-13 05:55:48 C 08 18 28.47 +57 11 07.4 – V T08
2020-05-13 06:10:31 C 08 18 29.88 +57 10 59.8 – V T08
2020-05-15 03:21:31 C 08 22 49.27 +56 48 20.8 – V 703
2020-05-15 03:29:09 C 08 22 50.01 +56 48 16.8 – V 703
2020-05-15 03:36:47 C 08 22 50.73 +56 48 13.1 – V 703
2020-05-15 03:44:25 C 08 22 51.48 +56 48 09.2 – V 703
2020-05-17 04:12:06 C 08 27 27.72 +56 23 44.9 – U I41
2020-05-17 05:47:55 C 08 27 36.72 +56 22 55.6 – U I41
2020-05-17 06:05:53 C 08 27 38.44 +56 22 48.5 – V T08
2020-05-17 06:10:31 C 08 27 38.88 +56 22 46.2 – V T08
2020-05-17 06:19:09 C 08 27 39.69 +56 22 41.7 – V T08
2020-05-17 06:33:49 C 08 27 41.07 +56 22 34.2 – V T08
2020-05-18 05:22:41 C 08 29 50.38 +56 11 01.1 – U I41
2020-05-18 05:26:44 C 08 29 50.76 +56 10 59.1 – U I41
2020-05-19 03:28:16 C 08 31 55.20 +55 59 50.8 – V 703
2020-05-19 03:36:32 C 08 31 55.99 +55 59 46.6 – V 703
2020-05-19 03:44:49 C 08 31 56.65 +55 59 43.9 – V 703
2020-05-19 03:53:06 C 08 31 57.31 +55 59 39.2 – V 703
2020-05-19 06:27:21 C 08 32 12.04 +55 58 20.8 – V T05
2020-05-19 06:42:47 C 08 32 13.41 +55 58 13.0 – V T05
2020-05-19 06:56:50 C 08 32 14.76 +55 58 05.4 – V T05
2020-05-23 03:47:00 C 08 40 54.44 +55 10 50.6 – V 703
2020-05-23 03:54:44 C 08 40 55.03 +55 10 47.3 – V 703
2020-05-23 04:02:27 C 08 40 55.76 +55 10 42.6 – V 703
2020-05-23 04:10:11 C 08 40 56.44 +55 10 38.3 – V 703
2020-05-23 04:26:11 C 08 40 57.97 +55 10 30.2 – U I41
2020-05-23 05:53:13 C 08 41 05.98 +55 09 44.9 – U I41
2020-05-24 05:38:36 C 08 43 17.68 +54 57 36.0 – U I41
2020-05-24 05:44:02 C 08 43 18.19 +54 57 33.3 – U I41
2020-05-27 03:52:56 C 08 49 44.25 +54 21 34.3 – V 703
2020-05-27 04:00:40 C 08 49 44.92 +54 21 30.1 – V 703
2020-05-27 04:08:25 C 08 49 45.65 +54 21 26.2 – V 703
2020-05-27 04:16:09 C 08 49 46.40 +54 21 22.1 – V 703
2020-05-30 04:13:12 C 08 56 17.84 +53 44 15.7 – U I41
2020-05-30 04:22:40 C 08 56 18.68 +53 44 10.7 – U I41
2020-05-30 04:55:31 C 08 56 21.63 +53 43 53.6 – U I41
2020-05-30 04:57:32 C 08 56 21.82 +53 43 52.4 – U I41
2020-06-02 05:52:16 C 09 02 53.79 +53 06 08.0 – V T08
2020-06-02 05:56:57 C 09 02 54.26 +53 06 05.1 – V T08
2020-06-02 06:01:35 C 09 02 54.53 +53 06 02.9 – V T08
2020-06-02 06:06:16 C 09 02 55.04 +53 05 59.7 – V T08
2020-06-02 06:06:56 C 09 02 55.02 +53 06 00.1 – V T08
2020-06-02 06:16:13 C 09 02 55.84 +53 05 55.6 – V T08
2020-06-02 06:25:32 C 09 02 56.73 +53 05 50.1 – V T08
2020-06-05 06:56:13 C 09 09 21.898 +52 28 06.23 – U F51
2020-06-05 07:11:30 C 09 09 23.249 +52 27 58.33 – U F51
2020-06-05 07:26:49 C 09 09 24.565 +52 27 50.28 – U F51
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)