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
1968-06-29 20:24:56 A 15 17 47.16 -20 54 36.5 095
1968-06-30 06:00:00 A 15 18 05.85 -21 09 22.2 662
1968-06-30 06:33:59 A 15 18 06.66 -21 10 12.4 662
1968-07-01 07:02:59 A 15 18 53.52 -21 44 42.4 662
1968-07-02 04:05:03 A 15 19 34.51 -22 11 17.6 693
1968-07-02 04:40:03 A 15 19 35.34 -22 11 59.3 693
1968-07-03 00:20:13 A 15 20 13.02 -22 34 09.4 808
1968-07-03 00:29:38 A 15 20 13.38 -22 34 19.2 805
1968-07-03 00:35:06 A 15 20 13.51 -22 34 25.7 805
1968-07-03 00:57:33 A 15 20 13.97 -22 34 50.3 805
1968-07-03 01:10:00 A 15 20 14.33 -22 35 03.8 805
1968-07-03 01:21:58 A 15 20 14.61 -22 35 16.1 805
1968-07-03 01:36:56 A 15 20 14.95 -22 35 32.9 805
1968-07-03 01:50:24 A 15 20 15.38 -22 35 49.0 805
1968-07-03 01:59:57 A 15 20 15.49 -22 35 59.4 808
1968-07-03 02:03:21 A 15 20 15.64 -22 36 01.7 805
1968-07-03 02:31:47 A 15 20 16.35 -22 36 32.9 805
1968-07-03 02:45:15 A 15 20 16.61 -22 36 47.7 805
1968-07-03 03:12:41 A 15 20 17.27 -22 37 17.2 805
1968-07-03 03:26:09 A 15 20 17.69 -22 37 31.8 805
1968-07-03 03:38:36 A 15 20 17.92 -22 37 45.3 805
1968-07-04 00:33:09 A 15 20 58.65 -22 59 32.8 805
1968-07-04 01:16:33 A 15 20 59.66 -23 00 16.7 805
1968-07-04 01:30:30 A 15 21 00.00 -23 00 30.0 805
1968-07-04 02:04:55 A 15 21 00.81 -23 01 05.2 805
1968-07-05 00:34:05 A 15 21 43.81 -23 22 23.3 808
1968-07-05 01:33:55 A 15 21 45.34 -23 23 19.0 808
1968-07-12 17:42:30 A 15 27 46.66 -25 27 27.0 051
1968-07-13 00:02:34 A 15 27 59.52 -25 30 36.8 808
1968-07-15 00:07:05 A 15 29 39.91 -25 53 13.0 805
1968-07-15 00:29:32 A 15 29 40.56 -25 53 23.4 805
1968-07-15 00:49:28 A 15 29 41.20 -25 53 34.7 805
1968-07-15 01:07:56 A 15 29 41.75 -25 53 40.3 805
1968-07-15 01:11:31 A 15 29 41.86 -25 53 44.0 808
1968-07-15 01:30:22 A 15 29 42.50 -25 53 52.4 805
1968-07-15 01:50:19 A 15 29 43.00 -25 53 59.1 805
1968-07-15 02:51:08 A 15 29 44.93 -25 54 26.1 805
1968-07-16 00:07:36 A 15 30 31.00 -26 03 37.3 808
1968-07-17 00:02:50 A 15 31 22.78 -26 13 26.4 808
1968-07-17 01:14:56 A 15 31 25.19 -26 13 55.3 805
1968-07-17 01:44:53 A 15 31 26.23 -26 14 08.0 805
1968-07-18 00:04:37 A 15 32 15.60 -26 22 47.7 805
1968-07-18 00:09:20 A 15 32 15.67 -26 22 50.4 808
1968-07-18 00:31:33 A 15 32 16.49 -26 22 58.2 805
1968-07-18 00:56:29 A 15 32 17.24 -26 23 08.1 805
1968-07-18 01:22:24 A 15 32 18.04 -26 23 17.5 805
1968-07-19 00:00:41 A 15 33 08.91 -26 31 40.8 805
1968-07-19 00:27:37 A 15 33 09.89 -26 31 52.0 805
1968-07-19 00:55:32 A 15 33 10.72 -26 32 02.1 805
1968-07-21 00:00:00 A 15 34 58.21 -26 48 23.1 807
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)