Astronomy:119 Althaea
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Short description: Main-belt asteroid
.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 |
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,[3] 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.[4] 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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