119 Althaea
Althaea (minor planet designation: 119 Althaea) is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on April 3, 1872, and named after Althaea, the mother of Meleager in Greek mythology. Two occultations by Althaea were observed in 2002, only a month apart.
A three-dimensional model of 119 Althaea based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | 3 April 1872 |
| Designations | |
MPC designation | (119) Althaea |
| Pronunciation | /ælˈθiːə/ |
Named after | Althaea |
Alternative designations | A872 GA; 1972 KO |
Minor planet category | Main belt |
| Orbital characteristics | |
| 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) |
Semi-major axis | 2.58147 AU (386.182 Gm) |
| Eccentricity | 0.080623 |
Orbital period (sidereal) | 4.15 yr (1515.0 d) |
Average orbital speed | 18.51 km/s |
Mean anomaly | 114.868° |
Mean motion | 0° 14m 15.472s / day |
| Inclination | 5.7831° |
Longitude of ascending node | 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 | 2.0×1017 kg |
Equatorial surface gravity | 0.0160 m/s2 |
Equatorial escape velocity | 0.0303 km/s |
Synodic rotation period | 11.484 h (0.4785 d) |
| 0.2306±0.010 | |
| Temperature | ~173 K |
| S | |
| 8.42 | |
Based upon its spectrum, this is classified as an S-type asteroid. 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.
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