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
2019-06-29 08:44:30 S 06 52 10.862 -72 36 49.21 V C57
2019-06-29 08:44:30 s 1 -188786.27 5 +302108.40 8930.0 C57
2019-06-29 09:14:30 S 06 52 12.329 -72 35 05.93 V C57
2019-06-29 09:14:30 s 1 -189344.03 2 +300831.14 2440.0 C57
2019-06-29 09:44:30 S 06 52 13.639 -72 33 30.17 V C57
2019-06-29 09:44:30 s 1 -189896.44 8 +299545.41 2970.0 C57
2019-06-29 10:14:30 S 06 52 15.338 -72 31 49.12 V C57
2019-06-29 10:14:30 s 1 -190443.47 2 +298251.18 340.0 C57
2019-06-29 10:44:30 S 06 52 16.690 -72 30 09.65 V C57
2019-06-29 10:44:30 s 1 -190985.05 5 +296948.45 4390.0 C57
2019-06-29 11:14:30 S 06 52 18.180 -72 28 29.06 V C57
2019-06-29 11:14:30 s 1 -191521.14 6 +295637.19 4930.0 C57
2019-06-29 11:44:30 S 06 52 19.721 -72 26 47.94 V C57
2019-06-29 11:44:30 s 1 -192051.69 2 +294317.38 1810.0 C57
2019-06-29 12:14:30 S 06 52 21.079 -72 25 06.64 V C57
2019-06-29 12:14:30 s 1 -192576.64 3 +292989.00 4850.0 C57
2019-06-29 12:44:30 S 06 52 22.680 -72 23 24.79 V C57
2019-06-29 12:44:30 s 1 -193095.94 4 +291652.05 3870.0 C57
2019-06-29 13:14:30 S 06 52 24.041 -72 21 48.71 V C57
2019-06-29 13:14:30 s 1 -193609.54 4 +290306.50 8690.0 C57
2019-06-29 13:44:30 S 06 52 25.505 -72 20 04.81 V C57
2019-06-29 13:44:30 s 1 -194117.38 7 +288952.33 9140.0 C57
2019-06-29 14:44:30 S 06 52 28.445 -72 16 44.58 V C57
2019-06-29 14:44:30 s 1 -195115.58 5 +286218.07 6160.0 C57
2019-06-29 15:14:30 S 06 52 29.993 -72 15 01.01 V C57
2019-06-29 15:14:30 s 1 -195605.82 9 +284837.95 2350.0 C57
2019-06-29 15:44:30 S 06 52 31.349 -72 13 29.03 V C57
2019-06-29 15:44:30 s 1 -196090.09 2 +283449.13 3430.0 C57
2019-06-29 16:14:30 S 06 52 32.849 -72 11 43.91 V C57
2019-06-29 16:14:30 s 1 -196568.31 9 +282051.60 9180.0 C57
2019-06-29 16:44:30 S 06 52 34.354 -72 10 03.68 V C57
2019-06-29 16:44:30 s 1 -197040.45 0 +280645.34 9420.0 C57
2019-06-29 17:14:30 S 06 52 35.686 -72 08 28.64 V C57
2019-06-29 17:14:30 s 1 -197506.42 7 +279230.34 3940.0 C57
2019-06-29 17:44:30 S 06 52 37.248 -72 06 40.54 V C57
2019-06-29 17:44:30 s 1 -197966.18 9 +277806.57 2550.0 C57
2019-06-29 18:06:59 C 06 53 53.32 -71 52 05.8 o K95
2019-06-29 18:12:35 C 06 53 53.80 -71 51 46.5 o K95
2019-06-29 18:14:30 S 06 52 38.642 -72 05 08.38 V C57
2019-06-29 18:14:30 s 1 -198419.67 6 +276374.01 5050.0 C57
2019-06-29 18:19:45 C 06 53 54.16 -71 51 24.3 o K95
2019-06-29 18:44:30 S 06 52 40.020 -72 03 23.11 V C57
2019-06-29 18:44:30 s 1 -198866.82 7 +274932.64 1210.0 C57
2019-06-29 19:14:30 S 06 52 41.618 -72 01 43.61 V C57
2019-06-29 19:14:30 s 1 -199307.57 9 +273482.45 840.0 C57
2019-06-29 19:44:30 S 06 52 42.958 -72 00 06.95 V C57
2019-06-29 19:44:30 s 1 -199741.86 9 +272023.41 3730.0 C57
2019-06-29 20:14:30 S 06 52 44.342 -71 58 26.15 V C57
2019-06-29 20:14:30 s 1 -200169.63 3 +270555.50 9650.0 C57
2019-06-29 20:44:30 S 06 52 45.902 -71 56 45.71 V C57
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)