.png) 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° 14 15.472 / day |
| Inclination | 5.7831° |
| Longitude of ascending node | 203.674° |
| Argument of perihelion | 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 | 2.0×10 kg |
| Equatorial surface gravity | 0.0160 m/s |
| Equatorial escape velocity | 0.0303 km/s |
| Synodic rotation period | 11.484 h (0.4785 d) |
| Geometric albedo | 0.2306±0.010 |
| Temperature | ~173 K |
| Spectral type | S |
| Absolute magnitude (H) | 8.42 |
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.
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.
References
- Noah Webster (1884) A Practical Dictionary of the English Language
- ^ Yeomans, Donald K., "119 Althaea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ Hutton, R. G. (June 1990), "V+B Photoelectric Photometry of Asteroid 119 Althaea", The Minor Planet Bulletin, vol. 17, pp. 15–17, Bibcode:1990MPBu...17...15H.
- DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, vol. 202, no. 1, pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.
External links
- 119 Althaea at AstDyS-2, Asteroids—Dynamic Site
- 119 Althaea at the JPL Small-Body Database
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