189 Phthia
| Discovery[1] | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery site | Clinton, New York |
| Discovery date | September 9, 1878 |
| Orbital characteristics[2][3] | |
| Aphelion | 2.541 AU |
| Perihelion | 2.360 AU |
| 2.450 AU | |
| Eccentricity | 0.037 |
| 3.84 years | |
| Inclination | 5.18° |
| Physical characteristics | |
| Dimensions | 40.91 ± 1.36[4] km |
| Mass | (3.84 ± 0.81) × 1016 kg[4] |
Mean density | 1.07 ± 0.25[4] g/cm3 |
| 22.346[5] h | |
| Albedo | 0.1566 ± 0.0349[6] |
Spectral type | S[6] (Tholen) |
| 9.60[6] | |
|
| |
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.
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.[5]
References
- 1 2 "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ Yeomans, Donald K., "189 Phthia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
- ↑ The Asteroid Orbital Elements Database
- 1 2 3 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.
- 1 2 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.
- 1 2 3 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
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