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
2015-06-21 22:43:50 C 14 26 11.34 -03 01 30.4 u I61
2015-06-22 03:03:19 C 14 27 39.39 -03 46 38.5 q W19
2015-06-22 03:05:04 C 14 27 39.94 -03 46 56.4 q W19
2015-06-22 03:07:57 C 14 27 40.85 -03 47 26.0 q W19
2015-06-22 03:11:26 C 14 27 41.93 -03 48 01.2 q W19
2015-06-22 19:45:16 C 14 32 41.08 -06 21 33.8 13.6 t 073
2015-06-22 19:50:04 C 14 32 42.35 -06 22 14.9 13.3 t 073
2015-06-22 19:55:31 C 14 32 43.80 -06 23 00.8 13.3 t 073
2015-06-22 20:00:18 C 14 32 45.01 -06 23 40.4 13.4 t 073
2015-06-22 20:05:06 C 14 32 46.26 -06 24 21.0 13.2 t 073
2015-06-22 20:10:33 C 14 32 47.76 -06 25 08.0 13.4 t 073
2015-06-22 20:15:19 C 14 32 48.94 -06 25 47.4 13.2 t 073
2015-06-22 20:20:05 C 14 32 50.18 -06 26 27.1 13.2 t 073
2015-06-22 20:25:34 C 14 32 51.63 -06 27 13.1 13.5 t 073
2015-06-22 20:30:20 C 14 32 52.87 -06 27 53.5 13.4 t 073
2015-06-22 20:35:07 C 14 32 54.13 -06 28 33.4 13.2 t 073
2015-06-22 20:39:53 C 14 32 55.40 -06 29 13.5 13.4 t 073
2015-06-22 20:45:21 C 14 32 56.80 -06 29 58.8 13.5 t 073
2015-06-22 20:49:26 C 14 32 57.84 -06 30 32.5 13.4 t 073
2015-06-22 20:55:21 C 14 32 59.40 -06 31 21.9 13.3 t 073
2015-06-22 20:59:17 C 14 33 01.66 -06 31 51.0 q K14
2015-06-22 21:00:08 C 14 33 00.68 -06 32 02.3 13.9 t 073
2015-06-22 21:04:54 C 14 33 01.87 -06 32 41.4 13.4 t 073
2015-06-22 21:09:40 C 14 33 03.13 -06 33 21.3 13.4 t 073
2015-06-22 21:10:20 C 14 33 04.51 -06 33 23.4 q K14
2015-06-22 21:15:08 C 14 33 04.55 -06 34 06.6 13.3 t 073
2015-06-22 21:18:25 C 14 33 06.66 -06 34 39.3 q C23
2015-06-22 21:19:54 C 14 33 05.80 -06 34 46.1 13.3 t 073
2015-06-22 21:20:38 C 14 33 07.23 -06 34 57.6 q C23
2015-06-22 21:20:58 C 14 33 07.24 -06 34 51.8 q K14
2015-06-22 21:23:04 C 14 33 07.87 -06 35 18.1 q C23
2015-06-22 21:25:22 C 14 33 07.20 -06 35 31.1 13.5 t 073
2015-06-22 21:25:32 C 14 33 08.52 -06 35 38.5 q C23
2015-06-22 21:27:59 C 14 33 09.14 -06 35 58.9 q C23
2015-06-22 21:30:08 C 14 33 08.49 -06 36 11.1 13.3 t 073
2015-06-22 21:32:11 C 14 33 10.12 -06 36 24.9 q K14
2015-06-22 21:34:55 C 14 33 09.72 -06 36 50.3 13.3 t 073
2015-06-22 21:40:21 C 14 33 11.12 -06 37 35.5 13.3 t 073
2015-06-22 21:41:55 C 14 33 12.57 -06 37 43.3 q K14
2015-06-22 21:45:07 C 14 33 12.31 -06 38 15.0 13.4 t 073
2015-06-22 21:49:53 C 14 33 13.71 -06 38 54.9 13.3 t 073
2015-06-22 21:54:39 C 14 33 15.03 -06 39 30.6 13.2 t 073
2015-06-23 02:12:24 C 14 34 25.90 -07 14 10.8 u H21
2015-06-23 02:14:22 C 14 34 26.39 -07 14 26.3 u H21
2015-06-23 02:16:20 C 14 34 26.88 -07 14 41.8 u H21
2015-06-23 02:19:45 C 14 34 27.71 -07 15 08.6 u H21
2015-06-23 02:21:43 C 14 34 28.19 -07 15 24.1 u H21
2015-06-23 02:23:40 C 14 34 28.66 -07 15 39.7 u H21
2015-06-23 02:25:38 C 14 34 29.14 -07 15 55.2 u H21
2015-06-23 02:28:04 C 14 34 29.74 -07 16 14.3 u H21
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)