Global Information1566 Icarus information
 Radar image of Icarus taken by the Goldstone Observatory in June 2015 | |
| Discovery[1] | |
|---|---|
| Discovered by | W. Baade |
| Discovery site | Palomar Obs. |
| Discovery date | 27 June 1949 |
| Designations | |
MPC designation | (1566) Icarus |
| Pronunciation | /ˈɪkərəs/[2] |
Named after | Icarus[3] (Greek mythology) |
Alternative designations | 1949 MA |
Minor planet category |
|
| Adjectives | Icarian /aɪˈkɛəriən/[5] |
| Symbol |  (astrological) |
| Orbital characteristics[4] | |
| Epoch 1 July 2021 (JD 2459396.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 72.11 yr (26,339 d) |
| Aphelion | 1.9697 AU |
| Perihelion | 0.1865 AU |
Semi-major axis | 1.0781 AU |
| Eccentricity | 0.8270 |
Orbital period (sidereal) | 1.12 yr (409 d) |
Mean anomaly | 180.73° |
Mean motion | 0° 52m 49.8s / day |
| Inclination | 22.812° |
Longitude of ascending node | 87.981° |
Argument of perihelion | 31.419° |
| Earth MOID | 0.0341 AU (13.3 LD) |
| Physical characteristics | |
| Dimensions | 1.61 km × 1.60 km × 1.17 km[6] |
Mean diameter |
|
Synodic rotation period |
|
Geometric albedo |
|
Spectral type |
|
Absolute magnitude (H) | 16.35[1][4] |
1566 Icarus (/ˈɪkərəs/ IK-ə-rəs; provisional designation: 1949 MA) is a large near-Earth object of the Apollo group and the lowest numbered potentially hazardous asteroid.[20] It has an extremely eccentric orbit (0.83) and measures approximately 1.4 km (0.87 mi) in diameter. In 1968, it became the first asteroid ever observed by radar.[3] Its orbit brings it closer to the Sun than Mercury and further out than the orbit of Mars, which also makes it a Mercury-, Venus-, and Mars-crossing asteroid. This stony asteroid and relatively fast rotator with a period of 2.27 hours was discovered on 27 June 1949, by German astronomer Walter Baade at the Palomar Observatory in California.[1] It was named after the mythological Icarus.[3]
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