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
1949-06-27 05:44:00 A 16 44 15.31 -27 57 25.4 675
1949-06-29 05:32:00 A 16 35 01.91 -28 22 30.0 675
1949-07-01 07:34:29 A 16 27 22.56 -28 41 45.8 675
1949-07-13 04:57:30 A 16 06 17.39 -29 34 12.3 675
1949-07-14 05:12:29 A 16 05 33.81 -29 36 45.0 675
1949-07-23 04:41:59 A 16 03 08.83 -29 55 38.6 675
1949-07-24 04:30:00 A 16 03 13.92 -29 57 31.4 675
1949-07-28 04:57:06 A 16 04 07.27 -30 05 02.5 672
1949-07-28 05:22:06 A 16 04 07.43 -30 05 03.9 672
1950-08-03 04:36:00 A 13 57 01.75 -12 16 03.2 675
1950-08-03 05:01:59 A 13 57 06.57 -12 16 43.6 675
1950-08-04 04:36:00 A 14 01 23.91 -12 54 03.9 675
1950-08-05 04:35:30 A 14 05 38.26 -13 30 23.5 675
1950-08-05 05:01:00 A 14 05 42.64 -13 31 00.4 675
1952-06-23 02:51:59 A 01 29 38 -16 05.3 079
1952-06-23 03:29:00 A 01 29 44 -16 05.2 079
1952-06-24 03:15:00 A 01 33 28 -15 59.8 079
1952-07-25 03:17:59 A 04 31 30 -08 58.7 079
1952-07-25 03:39:29 A 04 31 37 -08 58.2 079
1953-08-08 02:35:30 A 01 48 57.51 -53 19 38.4 079
1953-08-08 03:19:29 A 01 49 05.80 -53 21 48.5 079
1953-08-10 02:08:57 A 01 59 39.05 -55 43 17.4 079
1953-08-10 02:50:59 A 01 59 49.21 -55 45 30.6 079
1953-08-11 01:53:07 A 02 05 39.47 -56 57 27.6 051
1953-08-13 02:36:26 A 02 19 46.77 -59 34 17.8 079
1953-08-13 03:21:24 A 02 20 00.79 -59 36 44.7 079
1953-08-14 02:23:13 A 02 27 44.80 -60 52 25.5 051
1953-08-15 02:19:17 A 02 36 37.17 -62 11 46.7 051
1953-08-18 02:46:23 A 03 10 20.81 -66 10 49.3 051
1953-08-22 03:30:29 A 04 19 35.08 -70 53 29.8 051
1954-07-30 22:38:57 A 22 11 24.99 -49 59 57.1 079
1954-07-30 23:32:59 A 22 11 17.19 -50 01 19.0 079
1954-08-23 21:35:28 A 20 02 05.27 -59 51 17.6 079
1954-08-23 22:30:56 A 20 01 50.21 -59 51 28.6 079
1957-07-01 07:31:08 A 19 58 57.72 -37 26 24.1 821
1957-07-01 08:11:07 A 19 58 50.90 -37 26 57.1 821
1958-05-15 10:34:06 A 23 03 14.25 +01 58 39.8 689
1958-05-15 10:56:02 A 23 03 10.88 +01 58 00.3 689
1958-05-23 10:03:18 A 22 32 07.97 -04 28 28.2 689
1958-05-23 10:38:12 A 22 32 01.54 -04 29 45.1 689
1958-06-18 02:57:05 A 19 46 03.04 -29 45 15.2 079
1958-06-18 03:24:35 A 19 45 53.70 -29 46 03.8 079
1958-06-22 03:02:25 A 19 14 26.52 -32 14 47.0 079
1958-06-23 08:58:19 A 19 04 59.74 -32 51 48.4 689
1958-06-23 09:15:16 A 19 04 54.41 -32 52 07.2 689
1958-06-25 09:47:01 A 18 50 07.86 -33 42 00.8 662
1958-06-25 10:13:02 A 18 49 59.87 -33 42 24.4 662
1958-06-25 10:41:01 A 18 49 51.50 -33 42 49.2 662
1958-07-08 06:11:37 A 17 37 56.56 -35 40 28.6 689
1958-07-08 06:43:01 A 17 37 51.11 -35 40 29.4 689
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)