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
2020-04-21 05:55:23 C 07 25 51.57 +61 28 00.8 – V T05
2020-04-21 06:09:49 C 07 25 53.02 +61 27 53.9 – V T05
2020-04-23 08:18:19 C 07 31 01.52 +61 04 05.5 – V T08
2020-04-23 08:23:55 C 07 31 02.10 +61 04 02.8 – V T08
2020-04-23 08:31:27 C 07 31 02.86 +61 03 59.4 – V T08
2020-04-23 08:49:37 C 07 31 04.71 +61 03 50.2 – V T08
2020-04-27 05:43:51 C 07 40 32.52 +60 19 27.8 – V T08
2020-04-27 05:48:29 C 07 40 32.99 +60 19 25.6 – V T08
2020-04-27 05:56:27 C 07 40 33.76 +60 19 21.5 – V T08
2020-04-27 06:15:08 C 07 40 35.63 +60 19 12.3 – V T08
2020-04-28 04:08:16 C 07 42 48.43 +60 08 39.6 – V 703
2020-04-28 04:15:55 C 07 42 49.19 +60 08 36.1 – V 703
2020-04-28 04:23:35 C 07 42 49.92 +60 08 32.5 – V 703
2020-04-28 04:31:15 C 07 42 50.71 +60 08 28.6 – V 703
2020-04-29 05:43:15 C 07 45 23.37 +59 56 21.0 – V T05
2020-04-29 05:49:53 C 07 45 24.04 +59 56 18.0 – V T05
2020-04-29 05:59:12 C 07 45 24.93 +59 56 12.9 – V T05
2020-04-29 06:13:49 C 07 45 26.36 +59 56 05.9 – V T05
2020-05-01 05:47:38 C 07 50 12.92 +59 33 04.5 – V T08
2020-05-01 05:52:18 C 07 50 13.40 +59 33 02.3 – V T08
2020-05-01 06:00:16 C 07 50 14.16 +59 32 58.6 – V T08
2020-05-01 06:17:34 C 07 50 15.90 +59 32 49.9 – V T08
2020-05-02 03:46:49 C 07 52 24.68 +59 22 23.0 – V 703
2020-05-02 03:55:15 C 07 52 25.58 +59 22 18.9 – V 703
2020-05-02 04:03:40 C 07 52 26.38 +59 22 15.8 – V 703
2020-05-02 04:12:05 C 07 52 27.22 +59 22 11.3 – V 703
2020-05-03 06:13:03 C 07 55 02.746 +59 09 30.94 – U F51
2020-05-03 06:50:18 C 07 55 06.42 +59 09 12.1 – V T05
2020-05-03 06:54:56 C 07 55 06.85 +59 09 10.0 – V T05
2020-05-03 07:03:34 C 07 55 07.70 +59 09 05.9 – V T05
2020-05-03 07:16:27 C 07 55 08.980 +59 08 59.43 – U F51
2020-05-03 07:18:07 C 07 55 09.15 +59 08 58.8 – V T05
2020-05-05 03:45:56 C 07 59 33.56 +58 47 13.7 – V 703
2020-05-05 03:47:51 C 07 59 33.80 +58 47 12.9 – V 703
2020-05-05 03:54:13 C 07 59 34.36 +58 47 09.6 – V 703
2020-05-05 03:56:08 C 07 59 34.66 +58 47 08.9 – V 703
2020-05-05 04:02:30 C 07 59 35.21 +58 47 05.7 – V 703
2020-05-05 04:04:26 C 07 59 35.46 +58 47 04.9 – V 703
2020-05-05 04:10:48 C 07 59 36.05 +58 47 01.4 – V 703
2020-05-05 04:12:44 C 07 59 36.30 +58 47 00.5 – V 703
2020-05-05 05:38:50 C 07 59 44.86 +58 46 19.7 – V T08
2020-05-05 05:43:30 C 07 59 45.30 +58 46 17.5 – V T08
2020-05-05 05:52:49 C 07 59 46.20 +58 46 12.7 – V T08
2020-05-05 06:07:27 C 07 59 47.61 +58 46 05.4 – V T08
2020-05-06 02:17:26 C 08 01 46.92 +58 36 10.0 – q I15
2020-05-06 02:20:32 C 08 01 47.23 +58 36 08.3 – q I15
2020-05-06 02:23:38 C 08 01 47.48 +58 36 07.2 – q I15
2020-05-11 06:52:37 C 08 13 56.38 +57 34 35.3 – V T05
2020-05-11 06:57:15 C 08 13 56.83 +57 34 33.2 – V T05
2020-05-11 07:05:12 C 08 13 57.60 +57 34 28.8 – 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)