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 15:24:15 S 21 28 18.115 -51 26 54.92 V C57
2020-08-03 15:24:15 s 1 +61989.368 0 +341296.69 6010.0 C57
2020-08-03 15:54:15 S 21 28 12.754 -51 27 22.14 V C57
2020-08-03 15:54:15 s 1 +61019.929 0 +342282.06 1720.0 C57
2020-08-03 16:54:15 S 21 28 01.970 -51 28 33.17 V C57
2020-08-03 16:54:15 s 1 +59075.129 0 +344221.41 1360.0 C57
2020-08-03 17:14:15 S 21 27 57.883 -51 28 58.62 V C57
2020-08-03 17:14:15 s 1 +58425.153 0 +344858.61 4050.0 C57
2020-08-03 17:34:15 S 21 27 54.442 -51 29 11.65 V C57
2020-08-03 17:34:15 s 1 +57774.343 0 +345491.20 6480.0 C57
2020-08-03 18:44:15 S 21 27 41.875 -51 30 31.32 V C57
2020-08-03 18:44:15 s 1 +55490.112 0 +347669.14 2980.0 C57
2020-08-03 18:54:15 S 21 27 40.157 -51 30 46.26 V C57
2020-08-03 18:54:15 s 1 +55163.000 0 +347975.71 3650.0 C57
2020-08-03 19:04:15 S 21 27 38.290 -51 30 54.97 V C57
2020-08-03 19:04:15 s 1 +54835.695 0 +348281.14 4260.0 C57
2020-08-03 19:14:15 S 21 27 36.715 -51 31 06.10 V C57
2020-08-03 19:14:15 s 1 +54508.198 0 +348585.44 4810.0 C57
2020-08-03 19:24:15 S 21 27 34.543 -51 31 19.34 V C57
2020-08-03 19:24:15 s 1 +54180.509 0 +348888.60 5290.0 C57
2020-08-03 19:34:15 S 21 27 33.007 -51 31 23.88 V C57
2020-08-03 19:34:15 s 1 +53852.632 0 +349190.63 5720.0 C57
2020-08-03 19:44:15 S 21 27 31.385 -51 31 40.98 V C57
2020-08-03 19:44:15 s 1 +53524.566 0 +349491.53 6080.0 C57
2020-08-03 19:54:15 S 21 27 29.671 -51 31 48.54 V C57
2020-08-03 19:54:15 s 1 +53196.313 0 +349791.29 6380.0 C57
2020-08-03 20:04:15 S 21 27 27.487 -51 31 58.12 V C57
2020-08-03 20:04:15 s 1 +52867.875 0 +350089.93 6620.0 C57
2020-08-03 20:24:15 S 21 27 23.765 -51 32 20.80 V C57
2020-08-03 20:24:15 s 1 +52210.450 0 +350683.82 6910.0 C57
2020-08-03 20:54:15 S 21 27 18.545 -51 32 59.68 V C57
2020-08-03 20:54:15 s 1 +51222.957 0 +351566.24 6890.0 C57
2020-08-03 21:14:15 S 21 27 14.645 -51 33 13.79 V C57
2020-08-03 21:14:15 s 1 +50563.742 0 +352148.90 6570.0 C57
2020-08-03 21:24:15 S 21 27 12.950 -51 33 28.15 V C57
2020-08-03 21:24:15 s 1 +50233.873 0 +352438.56 6320.0 C57
2020-08-03 21:34:15 S 21 27 11.414 -51 33 40.72 V C57
2020-08-03 21:34:15 s 1 +49903.831 0 +352727.10 6010.0 C57
2020-08-03 21:44:15 S 21 27 09.108 -51 33 46.80 V C57
2020-08-03 21:44:15 s 1 +49573.617 0 +353014.53 5650.0 C57
2020-08-03 21:54:15 S 21 27 07.145 -51 34 00.91 V C57
2020-08-03 21:54:15 s 1 +49243.234 0 +353300.84 5220.0 C57
2020-08-03 23:04:15 S 21 26 54.574 -51 35 15.65 V C57
2020-08-03 23:04:15 s 1 +46925.898 0 +355273.95 570.0 C57
2020-08-03 23:14:15 S 21 26 52.322 -51 35 29.94 V C57
2020-08-03 23:14:15 s 1 +46594.202 0 +355551.40 9670.0 C57
2020-08-03 23:24:15 S 21 26 51.084 -51 35 39.62 V C57
2020-08-03 23:24:15 s 1 +46262.348 0 +355827.74 8710.0 C57
2020-08-03 23:34:15 S 21 26 48.926 -51 35 50.64 V C57
2020-08-03 23:34:15 s 1 +45930.336 0 +356102.99 7700.0 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)