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
2020-07-31 14:04:15 S 21 41 29.167 -50 02 48.52 – V C57
2020-07-31 14:04:15 s 1 +124666.14 3 +41611.856 40.0 – C57
2020-07-31 14:14:15 S 21 41 26.558 -50 02 59.35 – V C57
2020-07-31 14:14:15 s 1 +125081.07 9 +42789.731 6880.0 – C57
2020-07-31 14:34:15 S 21 41 22.690 -50 03 17.71 – V C57
2020-07-31 14:34:15 s 1 +125887.75 0 +45137.488 7660.0 – C57
2020-07-31 14:44:15 S 21 41 21.571 -50 03 32.94 – V C57
2020-07-31 14:44:15 s 1 +126279.70 0 +46307.318 1610.0 – C57
2020-07-31 14:54:15 S 21 41 19.339 -50 03 43.70 – V C57
2020-07-31 14:54:15 s 1 +126664.20 1 +47474.420 4630.0 – C57
2020-07-31 15:14:15 S 21 41 15.362 -50 04 10.56 – V C57
2020-07-31 15:14:15 s 1 +127411.26 9 +49800.351 7900.0 – C57
2020-07-31 15:24:15 S 21 41 14.237 -50 04 18.23 – V C57
2020-07-31 15:24:15 s 1 +127774.03 7 +50959.141 8190.0 – C57
2020-07-31 15:34:15 S 21 41 12.410 -50 04 32.16 – V C57
2020-07-31 15:34:15 s 1 +128129.75 9 +52115.123 7580.0 – C57
2020-07-31 15:44:15 S 21 41 10.037 -50 04 45.16 – V C57
2020-07-31 15:44:15 s 1 +128478.53 2 +53268.282 6100.0 – C57
2020-07-31 16:04:15 S 21 41 06.185 -50 05 11.15 – V C57
2020-07-31 16:04:15 s 1 +129155.60 8 +55566.067 570.0 – C57
2020-07-31 16:14:15 S 21 41 04.654 -50 05 17.66 – V C57
2020-07-31 16:14:15 s 1 +129484.09 4 +56710.666 6530.0 – C57
2020-07-31 16:24:15 S 21 41 02.443 -50 05 34.19 – V C57
2020-07-31 16:24:15 s 1 +129806.00 1 +57852.386 1670.0 – C57
2020-07-31 16:44:15 S 21 40 59.021 -50 05 59.78 – V C57
2020-07-31 16:44:15 s 1 +130430.42 5 +60127.144 9500.0 – C57
2020-07-31 16:54:15 S 21 40 57.545 -50 06 10.69 – V C57
2020-07-31 16:54:15 s 1 +130733.11 4 +61260.162 2210.0 – C57
2020-07-31 17:04:15 S 21 40 56.350 -50 06 21.96 – V C57
2020-07-31 17:04:15 s 1 +131029.56 6 +62390.261 4140.0 – C57
2020-07-31 17:14:15 S 21 40 53.657 -50 06 34.42 – V C57
2020-07-31 17:14:15 s 1 +131319.86 5 +63517.432 5290.0 – C57
2020-07-31 17:24:15 S 21 40 52.565 -50 06 41.54 – V C57
2020-07-31 17:24:15 s 1 +131604.09 1 +64641.670 5670.0 – C57
2020-07-31 17:34:15 S 21 40 50.686 -50 06 58.57 – V C57
2020-07-31 17:34:15 s 1 +131882.32 2 +65762.967 5290.0 – C57
2020-07-31 17:44:15 S 21 40 48.538 -50 07 12.79 – V C57
2020-07-31 17:44:15 s 1 +132154.63 9 +66881.317 4170.0 – C57
2020-07-31 18:14:15 S 21 40 42.763 -50 07 47.46 – V C57
2020-07-31 18:14:15 s 1 +132936.85 5 +70218.641 6420.0 – C57
2020-07-31 18:24:15 S 21 40 41.400 -50 07 56.82 – V C57
2020-07-31 18:24:15 s 1 +133186.26 3 +71325.161 2400.0 – C57
2020-07-31 18:44:15 S 21 40 37.488 -50 08 24.58 – V C57
2020-07-31 18:44:15 s 1 +133668.51 6 +73529.301 2270.0 – C57
2020-07-31 18:54:15 S 21 40 35.458 -50 08 40.38 – V C57
2020-07-31 18:54:15 s 1 +133901.50 0 +74626.918 6170.0 – C57
2020-07-31 19:04:15 S 21 40 34.788 -50 08 51.83 – V C57
2020-07-31 19:04:15 s 1 +134129.14 7 +75721.564 9400.0 – C57
2020-07-31 19:14:15 S 21 40 32.784 -50 08 56.04 – V C57
2020-07-31 19:14:15 s 1 +134351.52 4 +76813.239 1950.0 – 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)