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
2020-02-05 09:16:30 C 04 49 23.44 +75 54 25.3 – V T05
2020-02-05 09:20:29 C 04 49 23.44 +75 54 23.0 – V T05
2020-02-05 09:25:07 C 04 49 23.40 +75 54 20.3 – V T05
2020-02-05 09:33:49 C 04 49 23.39 +75 54 15.3 – V T05
2020-02-05 09:49:08 C 04 49 23.33 +75 54 06.7 – V T05
2020-02-05 12:44:01 C 04 49 24.56 +75 52 29.9 – o D54
2020-02-05 13:35:22 C 04 49 24.48 +75 52 01.2 – o D54
2020-02-06 13:29:27 C 04 49 31.86 +75 38 54.2 – o D54
2020-02-06 14:09:31 C 04 49 32.13 +75 38 31.7 – o D54
2020-02-06 20:59:36 n 04 49 36.39 +75 34 48.6 – V Z43
2020-02-06 21:14:26 n 04 49 36.45 +75 34 40.2 – V Z43
2020-02-06 21:29:32 n 04 49 36.56 +75 34 32.0 – V Z43
2020-02-06 21:54:26 n 04 49 36.69 +75 34 18.2 – V Z43
2020-02-06 22:17:17 n 04 49 36.85 +75 34 05.6 – V Z43
2020-02-06 22:27:28 n 04 49 36.90 +75 33 59.8 – V Z43
2020-02-07 21:25:24 C 04 49 55.67 +75 21 28.9 – a 233
2020-02-07 21:31:38 C 04 49 55.76 +75 21 25.5 – a 233
2020-02-07 21:38:27 C 04 49 55.83 +75 21 21.7 – a 233
2020-02-15 06:43:10 C 04 56 05.00 +73 47 07.2 – V T08
2020-02-15 06:47:48 C 04 56 05.21 +73 47 04.8 – V T08
2020-02-15 06:55:55 C 04 56 05.57 +73 47 00.5 – V T08
2020-02-15 07:11:15 C 04 56 06.27 +73 46 52.3 – V T08
2020-02-19 03:02:02 C 05 01 20.26 +72 59 41.1 – U I41
2020-02-19 05:16:05 C 05 01 28.10 +72 58 32.3 – U I41
2020-02-19 23:30:33 S 05 02 39.11 +72 49 16.1 – L C51
2020-02-20 02:38:19 S 05 02 51.44 +72 47 41.6 – L C51
2020-02-20 03:14:03 C 05 02 53.61 +72 47 27.1 – U I41
2020-02-20 04:18:58 C 05 02 57.57 +72 46 54.1 – U I41
2020-02-20 05:47:22 S 05 03 03.86 +72 46 06.2 – L C51
2020-02-20 10:29:56 S 05 03 22.68 +72 43 44.1 – L C51
2020-02-20 12:03:16 S 05 03 28.78 +72 42 57.5 – L C51
2020-02-20 12:03:27 S 05 03 28.84 +72 42 56.9 – L C51
2020-02-20 13:37:31 S 05 03 35.10 +72 42 10.0 – L C51
2020-02-20 15:12:30 S 05 03 41.50 +72 41 22.1 – L C51
2020-02-20 16:46:34 S 05 03 47.78 +72 40 35.0 – L C51
2020-02-20 18:20:49 S 05 03 54.16 +72 39 47.3 – L C51
2020-02-20 19:54:53 S 05 04 00.50 +72 39 00.3 – L C51
2020-02-20 21:29:08 S 05 04 06.89 +72 38 12.9 – L C51
2020-02-20 23:03:23 S 05 04 13.28 +72 37 25.6 – L C51
2020-02-21 00:37:28 S 05 04 19.73 +72 36 38.3 – L C51
2020-02-21 05:20:02 S 05 04 38.97 +72 34 17.1 – L C51
2020-02-21 07:57:57 C 05 04 49.05 +72 33 01.8 – V T05
2020-02-21 08:02:19 C 05 04 49.37 +72 32 59.5 – V T05
2020-02-21 08:09:39 C 05 04 49.82 +72 32 55.8 – V T05
2020-02-21 08:22:53 C 05 04 50.69 +72 32 49.0 – V T05
2020-02-21 08:28:20 S 05 04 51.96 +72 32 43.1 – L C51
2020-02-21 11:36:40 S 05 05 04.97 +72 31 08.7 – L C51
2020-02-21 11:36:51 S 05 05 04.97 +72 31 08.8 – L C51
2020-02-23 06:30:57 C 05 08 08.60 +72 09 54.9 – V T08
2020-02-23 06:35:40 C 05 08 08.92 +72 09 52.5 – 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)