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
1968-07-21 00:15:59 A 15 34 58.79 -26 48 28.7 807
1968-07-24 00:13:56 A 15 37 48.79 -27 10 59.7 805
1968-07-24 00:42:52 A 15 37 50.02 -27 11 09.3 805
1968-07-24 01:29:44 A 15 37 51.63 -27 11 23.6 805
1968-07-25 00:21:58 A 15 38 47.63 -27 18 02.2 805
1968-07-25 00:47:53 A 15 38 48.59 -27 18 09.1 805
1968-07-25 01:07:51 A 15 38 49.23 -27 18 14.1 805
1968-07-25 18:22:50 A 15 39 31.67 -27 23 05.4 079
1968-08-15 03:44:59 A 16 02 16.32 -29 08 21.7 693
1968-08-15 04:51:59 A 16 02 19.60 -29 08 32.6 693
1976-05-28 10:40:54 A 21 27 52.28 -22 46 05.1 695
1976-05-28 10:56:49 A 21 27 51.28 -22 46 20.5 695
1976-06-05 10:02:57 A 21 13 21.10 -26 10 48.2 19.4 695
1976-06-06 09:42:01 A 21 11 08.13 -26 37 34.9 807
1976-06-06 10:23:31 A 21 11 03.99 -26 38 22.8 807
1976-06-27 08:55:00 A 20 01 19.10 -36 06 57.4 18.8 695
1977-06-12 14:58:35 A 20 25 12.05 -21 59 27.8 474
1977-06-15 11:33:46 A 19 51 16.15 -25 43 37.4 474
1977-06-15 11:47:31 A 19 51 09.57 -25 44 16.9 474
1977-06-23 16:34:59 A 18 26 03.91 -31 55 47.6 323
1982-08-20 13:12:04 A 20 53 48.63 -62 44 42.5 474
1982-08-20 13:54:53 A 20 53 34.79 -62 45 19.5 474
1985-06-21 15:48:22 A 20 46 30.82 -33 45 31.9 474
1985-06-21 17:20:11 A 20 46 19.31 -33 47 06.7 474
1986-06-05 09:28:56 A 21 14 09.14 -21 34 32.0 B 691
1986-06-05 09:37:39 A 21 14 07.47 -21 34 49.0 B 691
1986-06-05 09:54:19 A 21 14 04.26 -21 35 21.0 B 691
1986-06-13 13:54:45 A 20 32 10.09 -27 45 46.4 474
1986-06-13 14:32:34 A 20 32 00.66 -27 46 56.7 474
1986-07-12 12:06:14 A 17 52 42.54 -37 26 43.7 474
1986-07-13 11:56:30 A 17 49 05.52 -37 25 49.3 474
1986-07-13 13:24:04 A 17 48 52.04 -37 25 45.2 474
1987-06-16 03:45:04 A 08 31 05.19 +40 01 34.3 B 691
1987-06-16 04:09:44 A 08 31 32.33 +40 00 15.1 B 691
1987-06-16 04:15:25 A 08 31 38.67 +39 59 56.7 B 691
1987-06-16 05:05:41 A 08 32 34.55 +39 57 13.8 675
1987-06-16 05:08:24 A 08 32 37.51 +39 57 04.6 675
1987-06-16 05:10:59 A 08 32 40.35 +39 56 56.0 675
1987-06-16 05:13:44 A 08 32 43.46 +39 56 47.2 675
1987-06-16 05:16:05 A 08 32 46.02 +39 56 39.2 675
1987-06-16 05:25:11 A 08 32 56.12 +39 56 09.1 675
1987-06-16 05:30:00 A 08 33 01.50 +39 55 52.8 675
1987-06-17 03:48:36 A 08 58 26.51 +38 30 09.8 B 691
1987-06-17 04:08:44 A 08 58 49.95 +38 28 36.6 B 691
1987-06-17 04:11:57 A 08 58 53.62 +38 28 21.1 B 691
1987-06-18 04:02:47 A 09 27 04.23 +36 22 34.4 B 691
1987-06-18 04:14:33 A 09 27 18.19 +36 21 22.1 B 691
1987-06-18 04:17:45 A 09 27 21.93 +36 21 02.0 B 691
1987-06-19 02:11:47 A 09 53 28.05 +33 53 34.5 A 801
1987-06-20 02:54:48 A 10 22 19.86 +30 33 52.9 A 801
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)