189 Phthia
Phthia (minor planet designation: 189 Phthia) is a bright-coloured, rocky main belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on September 9, 1878[1] in Clinton, New York and named after Phthia, a region of Ancient Greece.
| Discovery[1] | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery site | Clinton, New York |
| Discovery date | 9 September 1878 |
| Designations | |
| (189) Phthia | |
| Pronunciation | /ˈθaɪ.ə/[2] |
| main-belt | |
| Orbital characteristics[3][4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.18 yr (49739 d) |
| Aphelion | 2.5415 AU (380.20 Gm) |
| Perihelion | 2.3597 AU (353.01 Gm) |
| 2.4506 AU (366.60 Gm) | |
| Eccentricity | 0.037105 |
| 3.84 yr (1401.2 d) | |
| 336.98° | |
| 0° 15m 24.912s / day | |
| Inclination | 5.1774° |
| 203.42° | |
| 168.03° | |
| Physical characteristics | |
| Dimensions | 37.66±2.0 km[3] 40.91 ± 1.36 km[5] |
| Mass | (3.84 ± 0.81) × 1016 kg[5] |
Mean density | 1.07 ± 0.25 g/cm3[5] |
| 22.346 h (0.9311 d)[3][6] | |
| 0.2310±0.027[3] 0.1566 ± 0.0349[7] | |
| S[7] (Tholen) | |
| 9.33,[3] 9.60[7] | |
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008 gave a light curve with a period of 22.346 ± 0.001 hours and a brightness variation of 0.26 ± 0.02 in magnitude.[6]
References
- "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
- Noah Webster (1884) A Practical Dictionary of the English Language
- Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", The Minor Planet Bulletin, 36 (1), pp. 25–27, Bibcode:2009MPBu...36...25P.
- Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan (1667), Bibcode:2012LPICo1667.6089P. See Table 4.
External links
- 189 Phthia at AstDyS-2, Asteroids—Dynamic Site
- 189 Phthia at the JPL Small-Body Database
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