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 in Clinton, New York and named after Phthia, a region of Ancient Greece.
3D convex shape model of 189 Phthia | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery site | Clinton, New York |
| Discovery date | 9 September 1878 |
| Designations | |
MPC designation | (189) Phthia |
| Pronunciation | /ˈθaɪ.ə/ |
Alternative designations | A878 RA |
Minor planet category | main-belt |
| Orbital characteristics | |
| 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) |
Semi-major axis | 2.4506 AU (366.60 Gm) |
| Eccentricity | 0.037105 |
Orbital period (sidereal) | 3.84 yr (1401.2 d) |
Mean anomaly | 336.98° |
Mean motion | 0° 15m 24.912s / day |
| Inclination | 5.1774° |
Longitude of ascending node | 203.42° |
| 168.03° | |
| Physical characteristics | |
| Dimensions | 37.66±2.0 km 40.91 ± 1.36 km |
| Mass | (3.84 ± 0.81) × 1016 kg |
Mean density | 1.07 ± 0.25 g/cm3 |
Synodic rotation period | 22.346 h (0.9311 d) |
| 0.2310±0.027 0.1566 ± 0.0349 | |
| S (Tholen) | |
| 9.33, 9.60 | |
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.
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