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
1968-06-25 20:06:19 A 15 14 24.15 -17 30 58.8 095
1968-06-25 20:23:40 A 15 14 24.66 -17 31 47.5 095
1968-06-25 22:49:00 A 15 14 30.13 -17 38 40.7 026
1968-06-25 22:52:00 A 15 14 30.25 -17 38 45.4 026
1968-06-25 22:55:03 A 15 14 30.35 -17 38 49.9 026
1968-06-26 00:50:29 A 15 14 36.52 -17 43 23.2 808
1968-06-26 02:13:43 A 15 14 38.71 -17 47 10.8 808
1968-06-26 02:26:43 A 15 14 38.88 -17 47 46.1 822
1968-06-26 02:40:05 A 15 14 39.26 -17 48 21.2 822
1968-06-26 03:50:13 A 15 14 43.46 -17 52 15.2 693
1968-06-26 04:07:14 A 15 14 43.93 -17 53 01.0 693
1968-06-26 05:06:59 A 15 14 45.87 -17 55 44.5 662
1968-06-26 05:24:00 A 15 14 46.33 -17 56 30.1 662
1968-06-26 19:41:59 A 15 15 18.56 -18 31 57.6 051
1968-06-27 04:49:16 A 15 15 38.23 -18 54 02.9 693
1968-06-27 04:55:31 A 15 15 38.62 -18 54 20.8 662
1968-06-27 05:01:16 A 15 15 38.55 -18 54 30.6 693
1968-06-27 05:15:31 A 15 15 39.14 -18 55 06.2 662
1968-06-27 19:34:59 A 15 16 09.67 -19 25 30.6 051
1968-06-28 00:26:09 A 15 16 20.29 -19 35 27.6 808
1968-06-28 00:52:05 A 15 16 21.12 -19 36 20.2 805
1968-06-28 00:55:45 A 15 16 21.23 -19 36 27.7 805
1968-06-28 00:56:04 A 15 16 21.08 -19 36 28.9 808
1968-06-28 01:00:50 A 15 16 20.93 -19 36 38.0 822
1968-06-28 01:03:39 A 15 16 21.38 -19 36 43.6 805
1968-06-28 01:14:50 A 15 16 21.33 -19 37 07.7 822
1968-06-28 01:25:59 A 15 16 21.79 -19 37 28.5 808
1968-06-28 01:52:51 A 15 16 22.56 -19 38 21.9 805
1968-06-28 01:55:55 A 15 16 22.52 -19 38 28.5 808
1968-06-28 01:57:50 A 15 16 22.65 -19 38 32.1 805
1968-06-28 02:07:34 A 15 16 22.94 -19 38 50.6 805
1968-06-28 02:17:32 A 15 16 23.21 -19 39 10.9 805
1968-06-28 02:25:49 A 15 16 23.24 -19 39 27.9 808
1968-06-28 02:27:45 A 15 16 23.42 -19 39 31.4 805
1968-06-28 02:44:43 A 15 16 23.82 -19 40 04.4 805
1968-06-28 02:59:30 A 15 16 24.19 -19 40 34.1 805
1968-06-28 03:09:24 A 15 16 24.49 -19 40 53.4 805
1968-06-28 04:59:00 A 15 16 29.04 -19 45 11.1 662
1968-06-28 05:19:00 A 15 16 29.60 -19 45 50.4 662
1968-06-28 19:30:00 A 15 16 58.52 -20 11 53.7 051
1968-06-28 20:18:39 A 15 16 59.34 -20 14 01.3 095
1968-06-28 20:30:02 A 15 16 59.52 -20 14 21.9 095
1968-06-29 00:47:53 A 15 17 09.47 -20 21 21.5 808
1968-06-29 01:12:05 A 15 17 09.79 -20 22 04.1 822
1968-06-29 01:22:48 A 15 17 10.30 -20 22 22.6 808
1968-06-29 01:25:05 A 15 17 10.11 -20 22 27.0 822
1968-06-29 01:57:42 A 15 17 11.12 -20 23 23.9 808
1968-06-29 05:10:59 A 15 17 17.64 -20 29 34.4 662
1968-06-29 05:42:00 A 15 17 18.37 -20 30 27.6 662
1968-06-29 20:14:26 A 15 17 46.79 -20 54 15.8 095
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)