IAA RAS IAA Minor Planet Database

1566 Icarus (1949 MA)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.8270057286 ± 2.08e-08
Semi-major axis (a)1.0780378356 AU ± 7.96e-10
Inclination (i)22.80322165° ± 4.67e-06
Long. of Asc. Node (Ω)87.95241860° ± 1.45e-06
Arg. of Perihelion (ω)31.43821085° ± 2.76e-06
Mean Anomaly (M)153.07893635° ± 3.50e-06
Mean Motion (n)0.8805646990°/day ± 9.75e-10
Perihelion dist (q)0.18649437 AU ± 2.24e-08
Aphelion dist (Q)1.96958130 AU ± 2.25e-08
Orbital Period1.11931160 yr ± 1.24e-09
NGA Modelr2
A2-4.25335087e-15 ± 1.75e-16 AU/d²
Physical Parameters
H (abs. magnitude)16.53
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.450″
Uncertainty0
Orbit TypeApollo
MOID0.033646 AU
Observations Used1864
Radar Obs Used23
Gaia Obs Used31
Oppositions7
Arc Total1949-2025
First Observation Used1949-06-27
Last Observation Used2025-08-18
Observations (2297)
Date Type RA Dec Mag Band Observatory
2020-08-03 23:44:15 S 21 26 47.134 -51 36 04.54 – V C57
2020-08-03 23:44:15 s 1 +45598.170 0 +356377.14 6630.0 – C57
2020-08-03 23:54:15 S 21 26 45.372 -51 36 08.71 – V C57
2020-08-03 23:54:15 s 1 +45265.848 0 +356650.18 5500.0 – C57
2020-08-04 00:14:15 S 21 26 41.923 -51 36 36.68 – V C57
2020-08-04 00:14:15 s 1 +44600.748 0 +357192.99 3070.0 – C57
2020-08-04 00:24:15 S 21 26 39.886 -51 36 46.51 – V C57
2020-08-04 00:24:15 s 1 +44267.972 0 +357462.75 1770.0 – C57
2020-08-04 00:54:15 S 21 26 34.447 -51 37 17.62 – V C57
2020-08-04 00:54:15 s 1 +43268.753 0 +358265.48 2470.0 – C57
2020-08-04 01:14:15 S 21 26 30.504 -51 37 41.27 – V C57
2020-08-04 01:14:15 s 1 +42601.877 0 +358795.18 5580.0 – C57
2020-08-04 01:24:15 S 21 26 28.486 -51 37 46.52 – V C57
2020-08-04 01:24:15 s 1 +42268.225 0 +359058.40 7220.0 – C57
2020-08-04 01:34:15 S 21 26 27.175 -51 37 57.76 – V C57
2020-08-04 01:34:15 s 1 +41934.430 0 +359320.54 8910.0 – C57
2020-08-04 01:44:15 S 21 26 25.584 -51 38 13.38 – V C57
2020-08-04 01:44:15 s 1 +41600.495 0 +359581.58 660.0 – C57
2020-08-04 01:54:15 S 21 26 22.975 -51 38 26.63 – V C57
2020-08-04 01:54:15 s 1 +41266.421 0 +359841.55 2470.0 – C57
2020-08-04 02:04:15 S 21 26 21.509 -51 38 31.45 – V C57
2020-08-04 02:04:15 s 1 +40932.209 0 +360100.43 4330.0 – C57
2020-08-04 02:14:15 S 21 26 19.978 -51 38 45.89 – V C57
2020-08-04 02:14:15 s 1 +40597.860 0 +360358.24 6240.0 – C57
2020-08-04 02:34:15 S 21 26 16.524 -51 39 01.84 – V C57
2020-08-04 02:34:15 s 1 +39928.757 0 +360870.60 230.0 – C57
2020-08-04 02:44:15 S 21 26 13.690 -51 39 22.64 – V C57
2020-08-04 02:44:15 s 1 +39594.005 0 +361125.17 2310.0 – C57
2020-08-04 02:54:15 S 21 26 12.422 -51 39 21.38 – V C57
2020-08-04 02:54:15 s 1 +39259.121 0 +361378.66 4440.0 – C57
2020-08-04 03:04:15 S 21 26 10.378 -51 39 34.31 – V C57
2020-08-04 03:04:15 s 1 +38924.106 0 +361631.07 6630.0 – C57
2020-08-04 03:34:15 S 21 26 04.966 -51 40 10.74 – V C57
2020-08-04 03:34:15 s 1 +37918.290 0 +362381.87 3510.0 – C57
2020-08-04 03:44:15 S 21 26 02.875 -51 40 22.73 – V C57
2020-08-04 03:44:15 s 1 +37582.764 0 +362630.00 5910.0 – C57
2020-08-04 04:04:15 S 21 26 00.029 -51 40 42.89 – V C57
2020-08-04 04:04:15 s 1 +36911.339 0 +363123.04 870.0 – C57
2020-08-04 04:14:15 S 21 25 58.418 -51 40 59.30 – V C57
2020-08-04 04:14:15 s 1 +36575.442 0 +363367.96 3430.0 – C57
2020-08-04 04:24:15 S 21 25 56.141 -51 41 05.68 – V C57
2020-08-04 04:24:15 s 1 +36239.424 0 +363611.81 6040.0 – C57
2020-08-04 04:34:15 S 21 25 53.882 -51 41 19.68 – V C57
2020-08-04 04:34:15 s 1 +35903.286 0 +363854.60 8710.0 – C57
2020-08-04 04:44:15 S 21 25 52.918 -51 41 23.28 – V C57
2020-08-04 04:44:15 s 1 +35567.029 0 +364096.32 1430.0 – C57
2020-08-04 05:04:15 S 21 25 48.773 -51 41 48.05 – V C57
2020-08-04 05:04:15 s 1 +34894.162 0 +364576.58 7020.0 – C57
2020-08-04 05:14:15 S 21 25 46.788 -51 41 56.18 – V C57
2020-08-04 05:14:15 s 1 +34557.554 0 +364815.12 9890.0 – C57
Radar Observations (40)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1968-06-14 05:30:00 115417.1 3 Hz 2388 -14 -13
1968-06-14 19:00:00 50487.7 4 Hz 7840 -2 -2
1968-06-14 22:20:00 -10324.1 3 Hz 2388 -14 -13
1968-06-14.229167 11541710 100 Hz 2388 252 253
1968-06-14.791667 5048770 400 Hz 7840 254 254
1968-06-14.930556 -1032410 100 Hz 2388 252 253
1968-06-15 03:00:00 -167331.6 4 Hz 7840 -2 -2
1968-06-15 04:30:00 -61207.2 3 Hz 2388 -14 -13
1968-06-15 09:40:00 -104441.9 3 Hz 2388 -14 -13
1968-06-15.125000 -16733160 400 Hz 7840 254 254
1968-06-15.187500 -6120720 100 Hz 2388 252 253
1968-06-15.402778 -10444190 100 Hz 2388 252 253
1968-06-16 01:40:00 -202453.5 3 Hz 2388 -14 -13
1968-06-16 06:30:00 -234710 3 Hz 2388 -14 -13
1968-06-16 10:00:00 -255404.7 3 Hz 2388 -14 -13
1968-06-16.069444 -20245350 100 Hz 2388 252 253
1968-06-16.270833 -23471000 100 Hz 2388 252 253
1968-06-16.416667 -25540470 100 Hz 2388 252 253
1996-06-08 14:00:00 560070 10 Hz 8510 -14 -14
1996-06-08.583333 56007000 1000 Hz 8510 253 253
1996-06-10 14:00:00 153114 10 Hz 8510 -14 -14
1996-06-10.583333 15311400 1000 Hz 8510 253 253
2015-06-13 23:50:00 1123284.559 5 Hz 8560 -14 -14
2015-06-14 00:30:00 70583814.78 20 us 8560 -14 -14
2015-06-14 01:10:00 70272229.12 3 us 8560 -14 -14
2015-06-14 23:30:00 822302.025 5 Hz 8560 -14 -14
2015-06-15 00:00:00 60903291.94 2.5 us 8560 -14 -14
2015-06-16 23:20:00 53984215.88 2.5 us 8560 -14 -14
2015-06-18 00:02:00 58591220.063 0.4 us 2380 -1 -1
2015-06-18 00:58:00 58866141.404 0.4 us 2380 -1 -1
2015-06-18 23:41:00 67308377.46 1 us 2380 -1 -1
2015-06-18.001389 585912200630 4000 us 2380 251 251
2015-06-18.040278 588661414040 4000 us 2380 251 251
2015-06-18.986806 673083774600 10000 us 2380 251 251
2015-06-19 01:37:00 68163275.576 1 us 2380 -1 -1
2015-06-19.067361 681632755760 10000 us 2380 251 251
2015-06-20 00:58:00 79708409.313 2 us 2380 -1 -1
2015-06-20 01:33:00 80022300.658 2 us 2380 -1 -1
2015-06-20.040278 797084093130 20000 us 2380 251 251
2015-06-20.064583 800223006580 20000 us 2380 251 251
Station codes
-14 DSS-14 Goldstone (70-m) -13 DSS-13 Goldstone (34-m) -2 Haystack (37-m) -1 Arecibo (305-m, 1963–2020)