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
1987-06-22 04:22:33 A 11 15 15.00 +22 40 50.0 B 691
1987-06-22 04:41:09 A 11 15 33.09 +22 37 41.2 B 691
1987-06-22 05:00:10 A 11 15 51.59 +22 34 27.7 B 691
1987-06-23 03:54:10 A 11 37 19.15 +18 42 22.2 688
1987-06-23 03:56:39 A 11 37 21.39 +18 41 56.8 688
1987-06-23 03:58:39 A 11 37 23.16 +18 41 36.7 688
1987-06-24 04:36:32 A 11 58 08.69 +14 37 01.1 B 691
1987-06-24 05:01:57 A 11 58 28.60 +14 32 51.2 B 691
1987-06-24 05:20:23 A 11 58 43.10 +14 29 49.7 B 691
1987-07-30 13:15:06 A 15 15 24.38 -24 20 11.6 286
1987-07-30 13:46:06 A 15 15 26.56 -24 20 24.8 286
1987-07-30 14:17:07 A 15 15 29.09 -24 20 41.3 286
1987-07-30 14:41:07 A 15 15 31.09 -24 20 58.3 286
1987-07-30 15:05:37 A 15 15 32.88 -24 21 11.2 286
1987-07-30 15:26:07 A 15 15 34.30 -24 21 18.0 286
1987-07-31 13:28:26 A 15 17 20.67 -24 33 01.1 286
1987-07-31 13:41:57 A 15 17 21.59 -24 33 08.4 286
1987-07-31 13:55:06 A 15 17 22.72 -24 33 15.8 286
1987-07-31 14:08:37 A 15 17 23.77 -24 33 22.1 286
1987-07-31 14:19:07 A 15 17 24.48 -24 33 27.9 286
1987-07-31 14:27:06 A 15 17 25.11 -24 33 31.9 286
1987-07-31 14:36:36 A 15 17 25.78 -24 33 36.7 286
1987-07-31 14:45:06 A 15 17 26.66 -24 33 42.2 286
1987-07-31 14:52:27 A 15 17 27.15 -24 33 45.9 286
1987-07-31 15:02:07 A 15 17 27.70 -24 33 49.8 286
1987-07-31 15:14:26 A 15 17 28.76 -24 33 54.9 286
1987-07-31 15:26:07 A 15 17 29.65 -24 34 01.4 286
1987-08-28 03:34:10 A 16 04 32.04 -28 20 11.7 688
1992-09-05 12:41:11 C 18 47 37.44 -53 13 47.4 413
1992-09-06 10:08:11 C 18 45 10.01 -53 04 24.9 413
1992-09-06 10:12:18 C 18 45 09.60 -53 04 23.2 413
1992-10-12 10:01:29 C 18 11 46.74 -46 02 11.9 413
1992-10-12 10:05:06 C 18 11 46.81 -46 02 09.7 413
1994-06-17 17:44:30 C 21 13 43.83 -32 05 20.5 413
1994-06-17 17:49:20 C 21 13 43.42 -32 05 25.2 413
1995-05-31 10:28:44 C 21 24 53.81 -22 19 30.9 711
1995-06-01 10:22:58 C 21 22 42.21 -22 48 49.5 711
1995-06-01 10:31:09 C 21 22 41.33 -22 49 00.6 711
1995-06-05 17:41:44 C 21 12 01.51 -24 59 56.9 413
1995-06-05 17:44:36 C 21 12 01.17 -25 00 00.5 413
1995-06-05 18:00:59 C 21 11 59.41 -25 00 35.1 z 360
1995-06-05 18:07:30 C 21 11 58.74 -25 00 42.6 z 360
1995-06-05 18:13:14 C 21 11 58.05 -25 00 51.0 z 360
1995-06-08 19:09:42 C 21 03 11.76 -26 36 49.0 413
1995-06-08 19:13:08 C 21 03 11.30 -26 36 53.5 413
1995-06-19 15:41:56 C 20 23 28.39 -32 19 06.1 413
1995-06-19 15:45:17 C 20 23 27.81 -32 19 10.2 413
1995-06-20 16:46:10 C 20 19 00.09 -32 49 47.7 413
1995-06-20 16:50:38 C 20 18 59.28 -32 49 53.2 413
1995-06-24 09:11:53 C 20 02 32.44 -34 31 39.0 711
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)