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
2020-08-01 08:24:15 S 21 38 10.219 -50 24 36.79 – V C57
2020-08-01 08:24:15 s 1 +139487.15 8 +154049.52 7510.0 – C57
2020-08-01 09:04:15 S 21 38 02.458 -50 25 22.12 – V C57
2020-08-01 09:04:15 s 1 +139262.53 1 +157519.53 3370.0 – C57
2020-08-01 09:34:15 S 21 37 56.522 -50 25 49.15 – V C57
2020-08-01 09:34:15 s 1 +139071.35 7 +160096.51 9700.0 – C57
2020-08-01 09:44:15 S 21 37 56.362 -50 26 09.67 – V C57
2020-08-01 09:44:15 s 1 +139003.41 1 +160950.68 4570.0 – C57
2020-08-01 09:54:15 S 21 37 54.902 -50 26 22.45 – V C57
2020-08-01 09:54:15 s 1 +138933.38 6 +161802.46 9160.0 – C57
2020-08-01 10:14:15 S 21 37 49.766 -50 26 42.18 – V C57
2020-08-01 10:14:15 s 1 +138787.17 0 +163498.84 7500.0 – C57
2020-08-01 10:24:15 S 21 37 48.780 -50 26 53.02 – V C57
2020-08-01 10:24:15 s 1 +138711.01 6 +164343.47 1250.0 – C57
2020-08-01 10:34:15 S 21 37 46.438 -50 27 04.32 – V C57
2020-08-01 10:34:15 s 1 +138632.85 6 +165185.73 4730.0 – C57
2020-08-01 10:44:15 S 21 37 45.324 -50 27 11.48 – V C57
2020-08-01 10:44:15 s 1 +138552.70 6 +166025.63 7940.0 – C57
2020-08-01 10:54:15 S 21 37 43.102 -50 27 31.21 – V C57
2020-08-01 10:54:15 s 1 +138470.58 4 +166863.17 880.0 – C57
2020-08-01 11:24:15 S 21 37 37.817 -50 28 08.54 – V C57
2020-08-01 11:24:15 s 1 +138212.55 7 +169361.77 8100.0 – C57
2020-08-01 12:04:15 S 21 37 30.845 -50 28 51.28 – V C57
2020-08-01 12:04:15 s 1 +137841.93 2 +172660.75 4070.0 – C57
2020-08-01 12:14:15 S 21 37 29.179 -50 29 09.17 – V C57
2020-08-01 12:14:15 s 1 +137744.63 6 +173479.74 4920.0 – C57
2020-08-01 12:24:15 S 21 37 28.486 -50 29 12.44 – V C57
2020-08-01 12:24:15 s 1 +137645.51 6 +174296.45 5520.0 – C57
2020-08-01 12:34:15 S 21 37 27.019 -50 29 22.02 – V C57
2020-08-01 12:34:15 s 1 +137544.58 6 +175110.87 5870.0 – C57
2020-08-01 13:44:15 S 21 37 13.258 -50 30 43.38 – V C57
2020-08-01 13:44:15 s 1 +136788.68 9 +180748.63 1440.0 – C57
2020-08-01 14:14:15 S 21 37 07.486 -50 31 19.38 – V C57
2020-08-01 14:14:15 s 1 +136439.07 3 +183131.32 5960.0 – C57
2020-08-01 14:44:15 S 21 37 02.376 -50 31 57.32 – V C57
2020-08-01 14:44:15 s 1 +136074.60 4 +185494.19 8390.0 – C57
2020-08-01 15:04:15 S 21 36 58.015 -50 32 17.81 – V C57
2020-08-01 15:04:15 s 1 +135823.55 1 +187058.51 2210.0 – C57
2020-08-01 15:14:15 S 21 36 57.682 -50 32 39.66 – V C57
2020-08-01 15:14:15 s 1 +135695.64 3 +187837.41 8780.0 – C57
2020-08-01 15:34:15 S 21 36 53.172 -50 32 50.14 – V C57
2020-08-01 15:34:15 s 1 +135435.12 4 +189388.74 1250.0 – C57
2020-08-01 15:54:15 S 21 36 49.387 -50 33 19.51 – V C57
2020-08-01 15:54:15 s 1 +135168.42 0 +190931.47 2850.0 – C57
2020-08-01 16:24:15 S 21 36 44.755 -50 33 53.46 – V C57
2020-08-01 16:24:15 s 1 +134756.98 2 +193229.56 8620.0 – C57
2020-08-01 16:34:15 S 21 36 42.322 -50 34 07.57 – V C57
2020-08-01 16:34:15 s 1 +134616.84 9 +193991.35 3440.0 – C57
2020-08-01 16:44:15 S 21 36 40.954 -50 34 21.54 – V C57
2020-08-01 16:44:15 s 1 +134475.24 2 +194751.02 8060.0 – 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)