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
2020-08-02 09:54:15 S 21 33 37.042 -50 54 00.11 V C57
2020-08-02 09:54:15 s 1 +113716.72 6 +262737.76 9770.0 C57
2020-08-02 10:04:15 S 21 33 35.590 -50 54 04.93 V C57
2020-08-02 10:04:15 s 1 +113468.40 1 +263307.04 7760.0 C57
2020-08-02 10:14:15 S 21 33 33.002 -50 54 23.65 V C57
2020-08-02 10:14:15 s 1 +113219.37 7 +263874.73 5630.0 C57
2020-08-02 10:24:15 S 21 33 31.548 -50 54 32.62 V C57
2020-08-02 10:24:15 s 1 +112969.65 6 +264440.82 3370.0 C57
2020-08-02 10:44:15 S 21 33 28.246 -50 54 51.16 V C57
2020-08-02 10:44:15 s 1 +112468.14 8 +265568.23 8500.0 C57
2020-08-02 10:54:15 S 21 33 26.551 -50 55 04.58 V C57
2020-08-02 10:54:15 s 1 +112216.36 8 +266129.55 5880.0 C57
2020-08-02 11:04:15 S 21 33 24.497 -50 55 09.66 V C57
2020-08-02 11:04:15 s 1 +111963.91 1 +266689.30 3140.0 C57
2020-08-02 11:14:15 S 21 33 22.750 -50 55 24.96 V C57
2020-08-02 11:14:15 s 1 +111710.78 1 +267247.47 280.0 C57
2020-08-02 11:24:15 S 21 33 21.206 -50 55 35.08 V C57
2020-08-02 11:24:15 s 1 +111456.98 1 +267804.06 7310.0 C57
2020-08-02 11:44:15 S 21 33 17.582 -50 55 58.22 V C57
2020-08-02 11:44:15 s 1 +110947.39 4 +268912.55 1000.0 C57
2020-08-02 12:04:15 S 21 33 13.018 -50 56 22.78 V C57
2020-08-02 12:04:15 s 1 +110435.18 2 +270014.78 4220.0 C57
2020-08-02 12:14:15 S 21 33 12.821 -50 56 32.35 V C57
2020-08-02 12:14:15 s 1 +110178.10 2 +270563.56 650.0 C57
2020-08-02 12:24:15 S 21 33 09.900 -50 56 51.14 V C57
2020-08-02 12:24:15 s 1 +109920.37 9 +271110.78 6970.0 C57
2020-08-02 12:34:15 S 21 33 08.316 -50 56 54.64 V C57
2020-08-02 12:34:15 s 1 +109662.01 6 +271656.46 3180.0 C57
2020-08-02 12:44:15 S 21 33 06.722 -50 57 14.98 V C57
2020-08-02 12:44:15 s 1 +109403.01 9 +272200.60 9260.0 C57
2020-08-02 13:14:15 S 21 33 01.193 -50 57 42.01 V C57
2020-08-02 13:14:15 s 1 +108622.25 4 +273823.75 6840.0 C57
2020-08-02 13:34:15 S 21 32 57.530 -50 58 01.70 V C57
2020-08-02 13:34:15 s 1 +108098.64 1 +274898.19 7990.0 C57
2020-08-02 14:24:15 S 21 32 48.948 -50 58 58.51 V C57
2020-08-02 14:24:15 s 1 +106778.97 7 +277557.63 3900.0 C57
2020-08-02 15:54:15 S 21 32 32.628 -51 00 39.71 V C57
2020-08-02 15:54:15 s 1 +104366.58 0 +282249.77 3630.0 C57
2020-08-02 16:04:15 S 21 32 30.689 -51 00 59.54 V C57
2020-08-02 16:04:15 s 1 +104095.69 0 +282763.67 7500.0 C57
2020-08-02 16:14:15 S 21 32 29.102 -51 00 58.50 V C57
2020-08-02 16:14:15 s 1 +103824.24 5 +283276.09 1270.0 C57
2020-08-02 16:24:15 S 21 32 26.779 -51 01 23.84 V C57
2020-08-02 16:24:15 s 1 +103552.24 8 +283787.03 4930.0 C57
2020-08-02 16:34:15 S 21 32 25.500 -51 01 36.41 V C57
2020-08-02 16:34:15 s 1 +103279.70 2 +284296.51 8490.0 C57
2020-08-02 16:44:15 S 21 32 23.878 -51 01 36.80 V C57
2020-08-02 16:44:15 s 1 +103006.61 0 +284804.51 1940.0 C57
2020-08-02 16:54:15 S 21 32 21.538 -51 01 57.97 V C57
2020-08-02 16:54:15 s 1 +102732.97 6 +285311.05 5290.0 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)