IAA RAS IAA Minor Planet Database

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
2020-07-18 00:55:11 C 22 21 34.11 -42 41 10.8 – o K95
2020-07-21 10:27:47 C 22 13 55.26 -44 33 04.9 – V T08
2020-07-21 10:33:57 C 22 13 54.55 -44 33 12.9 – V T08
2020-07-21 10:41:56 C 22 13 53.68 -44 33 23.8 – V T08
2020-07-21 10:56:37 C 22 13 52.19 -44 33 44.4 – V T08
2020-07-23 11:20:04 C 22 08 37.25 -45 40 34.6 – V T05
2020-07-23 11:24:40 C 22 08 36.70 -45 40 41.3 – V T05
2020-07-23 11:28:38 C 22 08 36.22 -45 40 46.3 – V T05
2020-07-23 11:29:57 C 22 08 36.12 -45 40 48.6 – V T05
2020-07-23 11:33:14 C 22 08 35.72 -45 40 52.9 – V T05
2020-07-23 11:37:11 C 22 08 35.27 -45 40 58.6 – V T05
2020-07-23 11:39:10 C 22 08 35.05 -45 41 01.4 – V T05
2020-07-23 12:04:25 C 22 08 32.08 -45 41 36.1 – V T05
2020-07-27 06:15:32 C 21 57 14.92 -47 44 59.2 – q X74
2020-07-27 06:35:40 C 21 57 12.15 -47 45 26.1 – q X74
2020-07-27 06:55:42 C 21 57 09.29 -47 45 53.0 – q X74
2020-07-30 22:24:49 C 21 44 17.02 -49 41 14.8 – o K95
2020-07-30 22:34:50 C 21 44 15.16 -49 41 28.3 – o K95
2020-07-31 08:44:15 S 21 42 27.828 -49 56 11.22 – V C57
2020-07-31 08:44:15 s 1 +106519.74 6 + 2782.751 9440.0 – C57
2020-07-31 08:54:15 S 21 42 26.078 -49 56 21.12 – V C57
2020-07-31 08:54:15 s 1 +107254.05 5 + 4018.333 6400.0 – C57
2020-07-31 09:34:15 S 21 42 18.518 -49 57 08.14 – V C57
2020-07-31 09:34:15 s 1 +110068.63 2 + 8954.724 8840.0 – C57
2020-07-31 10:04:15 S 21 42 13.531 -49 57 48.20 – V C57
2020-07-31 10:04:15 s 1 +112055.78 3 +12647.447 2620.0 – C57
2020-07-31 10:24:15 S 21 42 07.934 -49 58 21.72 – V C57
2020-07-31 10:24:15 s 1 +113324.19 6 +15103.111 1390.0 – C57
2020-07-31 11:44:15 S 21 41 54.314 -49 59 52.26 – V C57
2020-07-31 11:44:15 s 1 +117975.12 5 +24861.398 3390.0 – C57
2020-07-31 11:54:15 S 21 41 51.564 -50 00 11.34 – V C57
2020-07-31 11:54:15 s 1 +118511.46 6 +26072.723 5490.0 – C57
2020-07-31 12:04:15 S 21 41 50.681 -50 00 19.76 – V C57
2020-07-31 12:04:15 s 1 +119038.28 9 +27281.955 6390.0 – C57
2020-07-31 12:14:15 S 21 41 48.353 -50 00 29.63 – V C57
2020-07-31 12:14:15 s 1 +119555.73 2 +28489.038 6110.0 – C57
2020-07-31 12:24:15 S 21 41 46.454 -50 00 43.92 – V C57
2020-07-31 12:24:15 s 1 +120063.93 3 +29693.921 4680.0 – C57
2020-07-31 12:34:15 S 21 41 45.038 -50 00 56.74 – V C57
2020-07-31 12:34:15 s 1 +120563.02 6 +30896.553 2090.0 – C57
2020-07-31 12:44:15 S 21 41 43.255 -50 01 06.31 – V C57
2020-07-31 12:44:15 s 1 +121053.14 4 +32096.886 8390.0 – C57
2020-07-31 13:14:15 S 21 41 37.560 -50 01 44.54 – V C57
2020-07-31 13:14:15 s 1 +122470.93 9 +35683.655 660.0 – C57
2020-07-31 13:24:15 S 21 41 35.686 -50 01 52.68 – V C57
2020-07-31 13:24:15 s 1 +122926.43 6 +36874.366 2600.0 – C57
2020-07-31 13:44:15 S 21 41 32.086 -50 02 21.48 – V C57
2020-07-31 13:44:15 s 1 +123812.51 1 +39248.248 3360.0 – C57
2020-07-31 13:54:15 S 21 41 30.506 -50 02 35.48 – V C57
2020-07-31 13:54:15 s 1 +124243.32 4 +40431.352 2200.0 – C57
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)