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
1955-01-26 10:48:59 11 40 46.07 +74 02 58.5 675
1955-01-26 11:33:59 11 40 40.92 +74 03 28.3 675
1964-04-16 03:03:27 A 15 44 41.00 +13 00 09.7 16.0 026
1972-12-05 18:26:59 A 02 28 37.72 +44 27 03.0 12.0 026
1972-12-05 18:38:59 A 02 28 35.35 +44 27 38.0 026
1972-12-06 17:23:00 A 02 24 03.23 +45 34 19.6 026
1972-12-06 19:56:59 A 02 23 32.66 +45 41 27.2 026
1972-12-08 03:56:47 A 02 17 50.5 +47 01 25 A 801
1972-12-08 04:20:00 A 02 17 46.72 +47 02 14.6 A 801
1972-12-08 14:00:40 A 02 16 12.52 +47 23 59.0 12.0 370
1972-12-08 14:19:59 A 02 16 09.24 +47 24 41.7 370
1972-12-08 15:24:00 A 02 15 58.63 +47 26 55.6 370
1972-12-09 11:44:00 A 02 12 55.74 +48 08 51.4 13.0 370
1972-12-09 11:53:00 A 02 12 54.36 +48 09 10.3 370
1972-12-10 15:51:59 A 02 09 02.58 +49 00 09.9 13.0 370
1972-12-10 17:55:00 A 02 08 50.06 +49 03 37.2 13.0 026
1972-12-10 19:12:59 A 02 08 39.49 +49 05 50.9 026
1972-12-11 04:24:43 A 02 07 28.82 +49 20 56.1 A 801
1972-12-11 10:53:30 A 02 06 44.13 +49 31 24.9 13.0 370
1972-12-11 14:03:00 A 02 06 20.10 +49 36 15.1 370
1972-12-11 21:26:00 A 02 05 29.92 +49 47 19.7 029
1972-12-11 21:38:30 A 02 05 28.43 +49 47 37.6 029
1972-12-11 23:34:17 A 02 05 16.94 +49 50 32.1 A 801
1972-12-12 12:17:59 A 02 03 52.89 +50 08 56.9 13.0 370
1972-12-12 13:05:00 A 02 03 47.62 +50 10 01.9 370
1972-12-12 17:32:46 A 02 03 21.92 +50 16 02.2 020
1972-12-12 17:39:45 A 02 03 21.16 +50 16 11.7 020
1972-12-12 17:45:14 A 02 03 20.53 +50 16 21.5 020
1972-12-12 17:49:13 A 02 03 20.10 +50 16 25.2 020
1972-12-12 17:52:12 A 02 03 19.75 +50 16 30.6 020
1972-12-12 17:54:12 A 02 03 19.53 +50 16 33.1 020
1972-12-12 17:58:11 A 02 03 19.13 +50 16 39.4 13.4 020
1972-12-12 18:04:11 A 02 03 18.42 +50 16 48.1 020
1972-12-12 23:50:29 A 02 02 40.79 +50 24 27.9 026
1972-12-13 00:09:30 A 02 02 38.58 +50 24 51.3 13.5 026
1972-12-13 02:38:30 A 02 02 23.82 +50 27 59.1 026
1972-12-13 05:08:14 A 02 02 10.21 +50 31 37.5 695
1972-12-13 05:15:25 A 02 02 09.44 +50 31 46.7 695
1972-12-13 12:32:30 A 02 01 27.98 +50 41 04.6 14.0 370
1972-12-14 13:52:00 A 01 59 13.06 +51 11 14.3 13.5 370
1972-12-14 14:01:59 A 01 59 12.09 +51 11 27.0 370
1972-12-14 19:13:09 A 01 58 49 +51 17.0 052
1972-12-15 06:05:30 A 01 57 55.81 +51 29 00.2 688
1972-12-15 06:31:30 A 01 57 53.79 +51 29 26.7 688
1972-12-15 07:00:00 A 01 57 51.40 +51 29 48.2 13.3 A 801
1972-12-15 13:01:30 A 01 57 25.19 +51 36 19.8 14.0 370
1972-12-15 13:19:30 A 01 57 23.49 +51 36 37.8 370
1972-12-15 17:19:58 A 01 57 08.30 +51 40 37.9 020
1972-12-15 17:26:57 A 01 57 07.73 +51 40 45.9 020
1972-12-16 00:00:52 A 01 56 37.46 +51 47 16.1 020
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)