433 Eros
Eros (minor planet designation (433) Eros; provisional designation 1898 DQ) is a stony asteroid of the Amor group, and the first discovered, and second-largest near-Earth object. It has an elongated shape and a volume-equivalent diameter of approximately 16.8 kilometers (10.4 miles). Visited by the NEAR Shoemaker space probe in 1998, it became the first asteroid ever studied from its own orbit.
Eros – composite image of the north polar region, with the craters Psyche above and Himeros below. The long ridge Hinks Dorsum, believed to be a thrust fault, can be seen snaking diagonally between them. The smaller crater in the foreground is Narcissus. Watters, (2011) | |
| Discovery | |
|---|---|
| Discovered by | C. G. Witt |
| Discovery site | Berlin Urania Obs. |
| Discovery date | 13 August 1898 |
| Designations | |
MPC designation | (433) Eros |
| Pronunciation | /ˈɪərɒs/ |
Named after | Ἔρως, Érōs |
Alternative designations |
|
Minor planet category |
|
| Adjectives | Erotian /ɛˈroʊʃ(i)ən/ |
| Symbol | (astrological) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 53.89 yr (19,683 days) |
| Earliest precovery date | 29 October 1893 |
| Aphelion | 1.7825 AU |
| Perihelion | 1.1334 AU |
Semi-major axis | 1.4579 AU |
| Eccentricity | 0.2226 |
Orbital period (sidereal) | 1.76 yr (643 days) |
Mean anomaly | 71.280° |
Mean motion | 0° 33m 35.64s / day |
| Inclination | 10.828° |
Longitude of ascending node | 304.32° |
| 178.82° | |
| Earth MOID | 0.1505 AU (58.6 LD) |
| Mars MOID | 0.2407 AU |
| Physical characteristics | |
| Dimensions |
|
| Mass | (6.687±0.003)×1015 kg |
Mean density | 2.67±0.03 g/cm3 |
Synodic rotation period | 5.270 h |
| 0.25±0.06 | |
| 7.0–15 | |
| 11.16 | |
The asteroid was discovered by German astronomer C. G. Witt at the Berlin Observatory on 13 August 1898 in an eccentric orbit between Mars and Earth. It was later named after Eros, a god from Greek mythology, the son of Aphrodite. He is identified with the planet Venus.
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