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
2019-07-15 02:14:30 s 1 -208166.29 0 +212986.94 3260.0 C57
2019-07-15 04:44:30 S 07 03 29.472 -55 53 34.33 V C57
2019-07-15 04:44:30 s 1 -208654.01 8 +203868.32 7580.0 C57
2019-07-15 05:14:30 S 07 03 29.815 -55 52 26.47 V C57
2019-07-15 05:14:30 s 1 -208721.31 6 +202014.99 2590.0 C57
2019-07-15 05:44:30 S 07 03 29.966 -55 51 19.22 V C57
2019-07-15 05:44:30 s 1 -208778.24 0 +200151.74 8010.0 C57
2019-07-15 06:14:30 S 07 03 30.202 -55 50 11.08 V C57
2019-07-15 06:14:30 s 1 -208824.66 2 +198278.53 3410.0 C57
2019-07-15 07:14:30 S 07 03 30.874 -55 48 00.97 V C57
2019-07-15 07:14:30 s 1 -208885.46 7 +194502.09 2390.0 C57
2019-07-15 07:44:30 S 07 03 31.013 -55 46 50.48 V C57
2019-07-15 07:44:30 s 1 -208899.57 9 +192598.81 5060.0 C57
2019-07-15 08:14:30 S 07 03 31.339 -55 45 41.40 V C57
2019-07-15 08:14:30 s 1 -208902.64 5 +190685.46 5900.0 C57
2019-07-15 08:44:30 S 07 03 31.476 -55 44 35.34 V C57
2019-07-15 08:44:30 s 1 -208894.52 4 +188761.99 4430.0 C57
2019-07-15 09:14:30 S 07 03 31.802 -55 43 28.42 V C57
2019-07-15 09:14:30 s 1 -208875.07 1 +186828.39 160.0 C57
2019-07-15 09:44:30 S 07 03 32.095 -55 42 19.33 V C57
2019-07-15 09:44:30 s 1 -208844.13 7 +184884.63 2600.0 C57
2019-07-15 10:14:30 S 07 03 32.246 -55 41 14.17 V C57
2019-07-15 10:14:30 s 1 -208801.57 1 +182930.67 1250.0 C57
2019-07-15 10:44:30 S 07 03 32.618 -55 40 04.66 V C57
2019-07-15 10:44:30 s 1 -208747.22 1 +180966.48 5570.0 C57
2019-07-15 11:14:30 S 07 03 32.856 -55 38 58.88 V C57
2019-07-15 11:14:30 s 1 -208680.92 8 +178992.05 5050.0 C57
2019-07-15 11:44:30 S 07 03 33.067 -55 37 51.49 V C57
2019-07-15 11:44:30 s 1 -208602.53 3 +177007.34 9140.0 C57
2019-07-15 12:14:30 S 07 03 33.449 -55 36 43.06 V C57
2019-07-15 12:14:30 s 1 -208511.87 2 +175012.32 7300.0 C57
2019-07-15 12:44:30 S 07 03 33.574 -55 35 39.05 V C57
2019-07-15 12:44:30 s 1 -208408.77 9 +173006.96 8960.0 C57
2019-07-15 13:14:30 S 07 03 33.888 -55 34 27.55 V C57
2019-07-15 13:14:30 s 1 -208293.08 4 +170991.24 3540.0 C57
2019-07-15 13:44:30 S 07 03 34.250 -55 33 22.93 V C57
2019-07-15 13:44:30 s 1 -208164.61 2 +168965.13 460.0 C57
2019-07-15 14:14:30 S 07 03 34.409 -55 32 15.11 V C57
2019-07-15 14:14:30 s 1 -208023.18 6 +166928.61 9110.0 C57
2019-07-15 14:44:30 S 07 03 34.819 -55 31 07.64 V C57
2019-07-15 14:44:30 s 1 -207868.62 5 +164881.64 8880.0 C57
2019-07-15 15:14:30 S 07 03 35.052 -55 30 01.19 V C57
2019-07-15 15:14:30 s 1 -207700.74 3 +162824.21 9140.0 C57
2019-07-15 15:44:30 S 07 03 35.321 -55 28 53.58 V C57
2019-07-15 15:44:30 s 1 -207519.35 3 +160756.28 9250.0 C57
2019-07-15 16:14:30 S 07 03 35.688 -55 27 47.34 V C57
2019-07-15 16:14:30 s 1 -207324.26 0 +158677.84 8550.0 C57
2019-07-15 16:44:30 S 07 03 35.875 -55 26 39.23 V C57
2019-07-15 16:44:30 s 1 -207115.26 8 +156588.85 6360.0 C57
2019-07-15 17:14:30 S 07 03 36.228 -55 25 32.16 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)