181 Eucharis
Main-belt asteroid
From Wikipedia, the free encyclopedia
181 Eucharis is a large, slowly rotating main-belt asteroid that was discovered by French astronomer Pablo Cottenot on February 2, 1878, from Marseille Observatory.[5] It was his only asteroid discovery. This object was named after Eucharis, a nymph from the 17th-century novel Les Aventures de Télémaque. It is orbiting the Sun at a distance of 3.13 AU with a moderate eccentricity of 0.20 and an orbital period of 5.54 years.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Pablo Cottenot |
| Discovery date | 2 February 1878 |
| Designations | |
| (181) Eucharis | |
| Pronunciation | /ËjuËkÉrɪs/[1] |
Named after | Eucharis |
| A878 CB; 1906 GA | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.63 yr (45157 d) |
| Aphelion | 3.7664 AU (563.45 Gm) |
| Perihelion | 2.49280 AU (372.918 Gm) |
| 3.12958 AU (468.179 Gm) | |
| Eccentricity | 0.20347 |
| 5.54 yr (2022.2 d) | |
Average orbital speed | 16.64 km/s |
| 32.3207° | |
| 0° 10m 40.879s / day | |
| Inclination | 18.890° |
| 143.224° | |
| 318.943° | |
| Earth MOID | 1.53686 AU (229.911 Gm) |
| Jupiter MOID | 1.47086 AU (220.038 Gm) |
| TJupiter | 3.099 |
| Physical characteristics | |
| Dimensions | 106.66±2.2 km |
| 52.23 h (2.176 d)[2][3] | |
| 0.1135±0.0054 | |
| S (Tholen) Xk (Bus)[4] | |
| 7.84 | |
In the Tholen classification system, it is categorized as a stony S-type asteroid, while the Bus asteroid taxonomy system lists it as an Xk asteroid.[4] Photometric observations of this asteroid at the Goat Mountain Astronomical Research Station in Rancho Cucamonga, California during 2007 gave a light curve with a leisurely rotation period of 52.23 ± 0.05 hours.[3] Based on infrared measurements, it has a diameter of 116 km.
This object is the namesake of a family of 149â778 asteroids that share similar spectral properties and orbital elements; hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.[6] In the case of 181 Eucharis, the orbital plane is inclined at an angle of 18.9° to the plane of the ecliptic.
