Astronomy:119 Althaea
.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 | |
| (119) Althaea | |
| Pronunciation | /ælˈθiːə/[1] |
| Named after | Althaea |
| A872 GA; 1972 KO | |
| Minor planet category | Main belt |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 143.99 yr (52593 d) |
| |{{{apsis}}}|helion}} | 2.7896 astronomical unit|AU (417.32 Gm) |
| |{{{apsis}}}|helion}} | 2.37335 AU (355.048 Gm) |
| 2.58147 AU (386.182 Gm) | |
| Eccentricity | 0.080623 |
| Orbital period | 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 |
| Rotation period | 11.484 h (0.4785 d)[2][3] |
| Geometric albedo | 0.2306±0.010 |
| Physics | ~173 K |
| 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,[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]
This object is orbiting the Sun at a distance of 2.58 astronomical unit|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]
References
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 2.0 2.1 Yeomans, Donald K., "119 Althaea", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=119, retrieved 12 May 2016.
- ↑ 3.0 3.1 3.2 Hutton, R. G. (June 1990), "V+B Photoelectric Photometry of Asteroid 119 Althaea", The Minor Planet Bulletin 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", Icarus 202 (1): pp. 160–180, doi:10.1016/j.icarus.2009.02.005, Bibcode: 2009Icar..202..160D, archived from the original on 2014-03-17, https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf, retrieved 2013-04-08. 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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