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
2021-04-27 21:06:17 C 14 03 21.96 +34 21 56.6 V G33
2021-04-27 21:07:58 C 14 03 21.82 +34 21 56.2 V G33
2021-04-27 21:09:39 C 14 03 21.69 +34 21 56.1 V G33
2021-04-27 21:11:23 C 14 03 21.58 +34 21 56.0 V G33
2021-04-27 21:13:01 C 14 03 21.48 +34 21 55.9 V G33
2021-04-27 21:14:42 C 14 03 21.36 +34 21 55.6 V G33
2021-04-28 10:15:25 C 14 02 28.07 +34 20 23.9 V T05
2021-04-28 10:19:24 C 14 02 27.79 +34 20 23.4 V T05
2021-04-28 10:29:58 C 14 02 27.07 +34 20 22.0 V T05
2021-04-28 10:46:28 C 14 02 25.914 +34 20 19.86 U F51
2021-04-28 10:46:29 C 14 02 25.91 +34 20 19.9 V T05
2021-04-28 11:05:27 C 14 02 24.592 +34 20 17.45 U F51
2021-04-28 11:23:09 C 14 02 23.368 +34 20 15.12 U F51
2021-04-28 20:04:39 C 14 01 48.18 +34 19 05.1 V K73
2021-04-28 20:08:19 C 14 01 47.96 +34 19 04.6 V K73
2021-04-28 20:12:51 C 14 01 47.68 +34 19 04.3 V K73
2021-04-28 20:18:18 C 14 01 47.26 +34 19 03.6 V K73
2021-04-29 10:44:51 C 14 00 48.28 +34 17 04.7 V T08
2021-04-29 11:29:05 C 14 00 45.21 +34 16 58.2 V T08
2021-04-29 12:09:52 C 14 00 42.40 +34 16 52.2 V T08
2021-04-29 12:21:45 C 14 00 41.59 +34 16 50.2 V T08
2021-04-29 12:22:25 C 14 00 41.54 +34 16 50.2 V T08
2021-04-29 12:28:06 C 14 00 41.15 +34 16 49.2 V T08
2021-04-29 12:35:55 C 14 00 40.61 +34 16 48.0 V T08
2021-04-30 08:10:54 C 13 59 21.38 +34 13 47.1 V 703
2021-04-30 08:18:29 C 13 59 20.85 +34 13 45.8 V 703
2021-04-30 08:26:05 C 13 59 20.32 +34 13 44.6 V 703
2021-04-30 08:33:40 C 13 59 19.82 +34 13 43.4 V 703
2021-05-01 09:53:41 C 13 57 37.87 +34 09 25.0 V T05
2021-05-01 10:26:41 C 13 57 35.61 +34 09 18.7 V T05
2021-05-01 10:31:25 C 13 57 35.27 +34 09 18.0 V T05
2021-05-01 10:40:38 C 13 57 34.65 +34 09 16.2 V T05
2021-05-01 11:28:16 C 13 57 31.403 +34 09 07.47 U F51
2021-05-01 11:36:39 C 13 57 30.830 +34 09 05.94 U F51
2021-05-01 11:45:04 C 13 57 30.256 +34 09 04.38 U F51
2021-05-02 12:12:15 C 13 55 52.465 +34 04 24.51 U F51
2021-05-02 12:20:37 C 13 55 51.901 +34 04 22.84 U F51
2021-05-02 12:29:00 C 13 55 51.339 +34 04 21.06 U F51
2021-05-02 12:37:22 C 13 55 50.768 +34 04 19.29 U F51
2021-05-03 03:53:39 C 13 54 50.13 +34 01 10.2 o Z22
2021-05-03 04:23:11 C 13 54 48.12 +34 01 03.5 o Z22
2021-05-03 05:01:22 C 13 54 45.54 +34 00 55.0 o Z22
2021-05-03 12:18:37 C 13 54 16.85 +33 59 22.5 V T08
2021-05-03 12:22:37 C 13 54 16.57 +33 59 21.6 V T08
2021-05-03 12:59:32 C 13 54 14.11 +33 59 13.3 V T08
2021-05-03 13:22:05 C 13 54 12.61 +33 59 08.2 V T08
2021-05-04 07:24:38 C 13 53 01.85 +33 55 04.5 V G96
2021-05-04 07:32:05 C 13 53 01.35 +33 55 02.7 V G96
2021-05-04 07:39:31 C 13 53 00.84 +33 55 01.1 V G96
2021-05-04 07:46:57 C 13 53 00.36 +33 54 59.2 V G96
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)