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
2019-07-07 16:44:30 S 07 02 06.926 -62 57 50.36 V C57
2019-07-07 16:44:30 s 1 +80566.653 0 +339951.95 4040.0 C57
2019-07-07 17:14:30 S 07 02 07.265 -62 56 38.69 V C57
2019-07-07 17:14:30 s 1 +79620.996 0 +341033.35 4400.0 C57
2019-07-07 17:44:30 S 07 02 07.608 -62 55 21.94 V C57
2019-07-07 17:44:30 s 1 +78673.068 0 +342104.91 8550.0 C57
2019-07-07 18:14:30 S 07 02 08.201 -62 54 09.72 V C57
2019-07-07 18:14:30 s 1 +77722.911 0 +343166.65 6690.0 C57
2019-07-07 18:44:30 S 07 02 08.501 -62 52 54.30 V C57
2019-07-07 18:44:30 s 1 +76770.569 0 +344218.61 9000.0 C57
2019-07-07 19:44:30 S 07 02 09.406 -62 50 26.59 V C57
2019-07-07 19:44:30 s 1 +74859.494 0 +346293.31 6830.0 C57
2019-07-07 20:14:30 S 07 02 09.722 -62 49 09.95 V C57
2019-07-07 20:14:30 s 1 +73900.842 0 +347316.13 2710.0 C57
2019-07-07 20:44:30 S 07 02 10.106 -62 47 58.70 V C57
2019-07-07 20:44:30 s 1 +72940.168 0 +348329.30 3480.0 C57
2019-07-07 21:14:30 S 07 02 10.596 -62 46 42.10 V C57
2019-07-07 21:14:30 s 1 +71977.511 0 +349332.85 9290.0 C57
2019-07-07 21:44:30 S 07 02 10.882 -62 45 28.80 V C57
2019-07-07 21:44:30 s 1 +71012.910 0 +350326.82 330.0 C57
2019-07-07 22:14:30 S 07 02 11.318 -62 44 16.37 V C57
2019-07-07 22:14:30 s 1 +70046.404 0 +351311.23 6760.0 C57
2019-07-07 22:44:30 S 07 02 11.774 -62 42 59.44 V C57
2019-07-07 22:44:30 s 1 +69078.031 0 +352286.13 8750.0 C57
2019-07-07 23:14:30 S 07 02 12.034 -62 41 48.08 V C57
2019-07-07 23:14:30 s 1 +68107.829 0 +353251.53 6460.0 C57
2019-07-07 23:44:30 S 07 02 12.538 -62 40 30.76 V C57
2019-07-07 23:44:30 s 1 +67135.836 0 +354207.47 50.0 C57
2019-07-08 00:14:30 S 07 02 12.948 -62 39 16.99 V C57
2019-07-08 00:14:30 s 1 +66162.087 0 +355153.99 9690.0 C57
2019-07-08 01:14:30 S 07 02 13.697 -62 36 49.50 V C57
2019-07-08 01:14:30 s 1 +64209.471 0 +357018.85 7750.0 C57
2019-07-08 01:44:30 S 07 02 14.059 -62 35 36.67 V C57
2019-07-08 01:44:30 s 1 +63230.675 0 +357937.26 6480.0 C57
2019-07-08 02:14:30 S 07 02 14.318 -62 34 21.18 V C57
2019-07-08 02:14:30 s 1 +62250.268 0 +358846.35 1880.0 C57
2019-07-08 02:44:30 S 07 02 14.842 -62 33 07.24 V C57
2019-07-08 02:44:30 s 1 +61268.284 0 +359746.17 4110.0 C57
2019-07-08 03:14:30 S 07 02 15.178 -62 31 53.65 V C57
2019-07-08 03:14:30 s 1 +60284.757 0 +360636.72 3320.0 C57
2019-07-08 03:44:30 S 07 02 15.456 -62 30 39.74 V C57
2019-07-08 03:44:30 s 1 +59299.723 0 +361518.06 9650.0 C57
2019-07-08 04:14:30 S 07 02 15.910 -62 29 26.88 V C57
2019-07-08 04:14:30 s 1 +58313.213 0 +362390.19 3260.0 C57
2019-07-08 04:44:30 S 07 02 16.255 -62 28 09.55 V C57
2019-07-08 04:44:30 s 1 +57325.263 0 +363253.15 4280.0 C57
2019-07-08 05:14:30 S 07 02 16.505 -62 26 58.27 V C57
2019-07-08 05:14:30 s 1 +56335.905 0 +364106.97 2870.0 C57
2019-07-08 05:44:30 S 07 02 17.047 -62 25 42.28 V C57
2019-07-08 05:44:30 s 1 +55345.171 0 +364951.68 9170.0 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)