119 Althaea
Main-belt asteroid
From Wikipedia, the free encyclopedia
119 Althaea is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on April 3, 1872,[3] and named after Althaea, the mother of Meleager in Greek mythology. Two occultations by Althaea were observed in 2002, only a month apart.[citation needed]
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A three-dimensional model of 119 Althaea based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | 3 April 1872 |
| Designations | |
| (119) Althaea | |
| Pronunciation | /ælËθiËÉ/[1] |
Named after | Althaea |
| A872 GA; 1972 KO | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 143.99 yr (52593 d) |
| Aphelion | 2.7896 AU (417.32 Gm) |
| Perihelion | 2.37335 AU (355.048 Gm) |
| 2.58147 AU (386.182 Gm) | |
| Eccentricity | 0.080623 |
| 4.15 yr (1515.0 d) | |
Average orbital speed | 18.51 km/s |
| 114.868° | |
| 0° 14m 15.472s / day | |
| Inclination | 5.7831° |
| 203.674° | |
| 170.021° | |
| Earth MOID | 1.37297 AU (205.393 Gm) |
| Jupiter MOID | 2.58409 AU (386.574 Gm) |
| TJupiter | 3.413 |
| Physical characteristics | |
| Dimensions | 57.30±1.1 km |
| Mass | 2.0Ã1017 kg |
Equatorial surface gravity | 0.0160 m/s2 |
Equatorial escape velocity | 0.0303 km/s |
| 11.484 h (0.4785 d)[2][3] | |
| 0.2306±0.010 | |
| Temperature | ~173 K |
| S | |
| 8.42 | |
This object is orbiting the Sun at a distance of 2.58 AU with an eccentricity of 0.08, bringing it as close as 2.37 AU and taking it as far as 2.79 AU over the course of its 4.15 year orbital period. The orbital plane is inclined at an angle of 5.78° relative to the plane of the ecliptic.
Based upon its spectrum, this is classified as an S-type asteroid.[4] Using infrared measurements, its diameter was measured as around 57 km. Photometric observations made in 1988 at the Félix Aguilar Observatory produced a light curve with a period of 11.484±0.010 hours with a brightness variation of 0.365±0.010 in magnitude.[3]
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