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
1995-06-25 08:29:37 C 19 58 03.26 -34 56 24.8 711
1995-06-25 08:39:27 C 19 58 01.31 -34 56 35.1 711
1995-06-26 09:02:18 C 19 53 16.26 -35 21 28.9 711
1995-06-27 08:55:11 C 19 48 34.51 -35 44 47.5 711
1995-06-27 09:04:11 C 19 48 32.60 -35 44 56.8 711
1995-07-06 16:00:52 C 19 04 29.71 -38 25 49.8 413
1995-07-06 16:07:03 C 19 04 28.53 -38 25 52.8 413
1995-07-20 12:52:05 C 18 09 20.14 -39 31 09.3 413
1995-07-20 12:55:25 C 18 09 19.64 -39 31 09.3 413
1996-06-07 18:35:43 C 22 45 19.06 +11 32 59.1 413
1996-06-07 18:38:02 C 22 45 16.71 +11 32 40.4 413
1996-06-07 18:40:59 C 22 45 13.69 +11 32 17.4 413
1996-06-07 18:43:18 C 22 45 11.32 +11 31 58.6 413
1996-06-08 20:12:56 C 22 18 11.64 +07 51 08.0 413
1996-06-08 20:15:29 C 22 18 08.78 +07 50 44.4 413
1996-06-08 20:17:51 C 22 18 06.09 +07 50 22.0 413
1996-06-08 23:07:09 C 22 15 01.78 +07 22 02.8 z 121
1996-06-08 23:08:42 C 22 15 00.05 +07 21 48.4 z 121
1996-06-08 23:53:45 C 22 14 09.10 +07 14 41.6 z 121
1996-06-08 23:55:39 C 22 14 06.96 +07 14 23.9 z 121
1996-06-09 18:47:48 C 21 52 18.73 +04 09 00.5 413
1996-06-09 18:52:39 C 21 52 12.89 +04 08 10.6 413
1996-06-09 23:14:08 C 21 47 04.69 +03 21 07.0 z 121
1996-06-09 23:18:41 C 21 46 59.18 +03 20 19.4 z 121
1996-06-09 23:43:46 C 21 46 28.88 +03 15 58.0 z 121
1996-06-09 23:45:46 C 21 46 26.46 +03 15 37.1 z 121
1996-06-10 17:37:22 C 21 24 42.06 +00 06 30.8 413
1996-06-10 17:39:35 C 21 24 39.27 +00 06 06.4 413
1996-06-10 17:41:58 C 21 24 36.29 +00 05 40.7 413
1996-06-12 11:59:03 C 20 32 06.71 -07 31 49.8 q 566
1996-06-12 12:15:21 C 20 31 46.32 -07 34 39.0 q 566
1996-06-12 12:31:40 C 20 31 25.87 -07 37 28.4 q 566
1996-06-13 00:50:57 C 20 16 26.41 -09 42 35.7 z 967
1996-06-13 00:57:02 C 20 16 18.94 -09 43 35.9 z 967
1996-06-13 01:03:13 C 20 16 11.39 -09 44 37.2 z 967
1996-06-13 01:29:17 C 20 15 39.61 -09 48 54.3 z 967
1996-06-13 01:37:48 C 20 15 29.36 -09 50 16.8 z 967
1996-06-13 12:01:24 C 20 03 08.088 -11 29 16.12 q 566
1996-06-13 12:22:55 C 20 02 42.346 -11 32 36.47 q 566
1996-06-13 12:39:36 C 20 02 22.406 -11 35 11.52 q 566
1996-06-13 22:47:59 C 19 50 41.05 -13 06 52.4 z 118
1996-06-13 22:49:35 C 19 50 39.23 -13 07 06.2 z 118
1996-06-13 22:53:49 C 19 50 34.34 -13 07 43.5 z 118
1996-06-14 12:02:39 C 19 35 53.735 -14 57 02.31 q 566
1996-06-14 12:21:17 C 19 35 33.004 -14 59 30.83 q 566
1996-06-14 12:40:48 C 19 35 11.355 -15 02 05.50 q 566
1996-06-15 06:06:59 C 19 16 52.85 -17 11 44.1 z 801
1996-06-15 06:09:46 C 19 16 49.97 -17 12 04.5 z 801
1996-06-15 08:32:32 C 19 14 26.41 -17 28 12.2 z 684
1996-06-15 08:33:58 C 19 14 24.92 -17 28 21.9 z 684
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)