1566 Icarus
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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]
Discovery[1] | |
---|---|
Discovered by | W. Baade |
Discovery site | Palomar Obs. |
Discovery date | 27 June 1949 |
Designations | |
(1566) Icarus | |
Pronunciation | /ˈɪkərəs/[2] |
Named after | Icarus[3] (Greek mythology) |
1949 MA | |
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 |
1.0781 AU | |
Eccentricity | 0.8270 |
1.12 yr (409 d) | |
180.73° | |
0° 52m 49.8s / day | |
Inclination | 22.812° |
87.981° | |
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 | |
16.35[1][4] | |