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
2019-06-21 17:14:30 s 1 +138261.36 4 +225900.98 2340.0 C57
2019-06-21 17:44:30 S 06 28 48.386 -83 26 07.19 V C57
2019-06-21 17:44:30 s 1 +137678.45 2 +227857.84 5130.0 C57
2019-06-21 18:14:30 S 06 28 59.450 -83 24 16.52 V C57
2019-06-21 18:14:30 s 1 +137087.00 5 +229800.75 3640.0 C57
2019-06-21 19:14:30 S 06 29 22.817 -83 20 28.07 V C57
2019-06-21 19:14:30 s 1 +135879.11 5 +233645.05 520.0 C57
2019-06-21 19:44:30 S 06 29 32.297 -83 18 48.53 V C57
2019-06-21 19:44:30 s 1 +135262.97 0 +235546.58 180.0 C57
2019-06-21 20:14:30 S 06 29 43.356 -83 16 55.99 V C57
2019-06-21 20:14:30 s 1 +134638.88 5 +237434.48 8150.0 C57
2019-06-21 20:44:30 S 06 29 54.590 -83 15 02.09 V C57
2019-06-21 20:44:30 s 1 +134007.00 0 +239308.81 5050.0 C57
2019-06-21 21:14:30 S 06 30 04.550 -83 13 14.70 V C57
2019-06-21 21:14:30 s 1 +133367.45 4 +241169.65 1480.0 C57
2019-06-21 21:44:30 S 06 30 14.839 -83 11 25.66 V C57
2019-06-21 21:44:30 s 1 +132720.38 2 +243017.07 8020.0 C57
2019-06-21 22:14:30 S 06 30 25.742 -83 09 32.15 V C57
2019-06-21 22:14:30 s 1 +132065.91 6 +244851.15 5270.0 C57
2019-06-21 22:44:30 S 06 30 35.417 -83 07 45.84 V C57
2019-06-21 22:44:30 s 1 +131404.18 5 +246671.96 3780.0 C57
2019-06-21 23:14:30 S 06 30 45.679 -83 05 52.15 V C57
2019-06-21 23:14:30 s 1 +130735.31 5 +248479.56 4110.0 C57
2019-06-21 23:44:30 S 06 30 56.074 -83 03 59.98 V C57
2019-06-21 23:44:30 s 1 +130059.43 2 +250274.04 6800.0 C57
2019-06-22 00:14:30 S 06 31 05.585 -83 02 13.31 V C57
2019-06-22 00:14:30 s 1 +129376.65 5 +252055.46 2390.0 C57
2019-06-22 00:44:30 S 06 31 15.221 -83 00 22.64 V C57
2019-06-22 00:44:30 s 1 +128687.10 6 +253823.88 1400.0 C57
2019-06-22 01:14:30 S 06 31 25.195 -82 58 31.69 V C57
2019-06-22 01:14:30 s 1 +127990.90 0 +255579.39 4340.0 C57
2019-06-22 01:44:30 S 06 31 35.018 -82 56 40.52 V C57
2019-06-22 01:44:30 s 1 +127288.15 1 +257322.04 1710.0 C57
2019-06-22 02:14:30 S 06 31 44.489 -82 54 47.88 V C57
2019-06-22 02:14:30 s 1 +126578.97 2 +259051.90 4020.0 C57
2019-06-22 02:44:30 S 06 31 53.645 -82 53 01.79 V C57
2019-06-22 02:44:30 s 1 +125863.47 3 +260769.04 1750.0 C57
2019-06-22 03:14:30 S 06 32 03.538 -82 51 07.31 V C57
2019-06-22 03:14:30 s 1 +125141.76 1 +262473.53 5370.0 C57
2019-06-22 03:44:30 S 06 32 11.921 -82 49 23.09 V C57
2019-06-22 03:44:30 s 1 +124413.94 2 +264165.42 5340.0 C57
2019-06-22 04:14:30 S 06 32 21.410 -82 47 28.39 V C57
2019-06-22 04:14:30 s 1 +123680.12 0 +265844.79 2140.0 C57
2019-06-22 04:44:30 S 06 32 30.538 -82 45 40.61 V C57
2019-06-22 04:44:30 s 1 +122940.39 6 +267511.70 6210.0 C57
2019-06-22 05:14:30 S 06 32 39.180 -82 43 51.10 V C57
2019-06-22 05:14:30 s 1 +122194.87 0 +269166.21 7980.0 C57
2019-06-22 05:44:30 S 06 32 47.926 -82 42 02.95 V C57
2019-06-22 05:44:30 s 1 +121443.64 0 +270808.38 7900.0 C57
2019-06-22 06:14:30 S 06 32 57.703 -82 40 03.61 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)