.png) A three-dimensional model of 174 Phaedra based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery date | 2 September 1877 |
| Designations | |
| MPC designation | (174) Phaedra |
| Pronunciation | /ˈfiːdrə/ |
| Alternative designations | A877 RA |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 138.61 yr (50629 d) |
| Aphelion | 3.2658 AU (488.56 Gm) |
| Perihelion | 2.4572 AU (367.59 Gm) |
| Semi-major axis | 2.8615 AU (428.07 Gm) |
| Eccentricity | 0.14128 |
| Orbital period (sidereal) | 4.84 yr (1768.0 d) |
| Mean anomaly | 330.70° |
| Mean motion | 0° 12 13.032 / day |
| Inclination | 12.124° |
| Longitude of ascending node | 327.69° |
| Argument of perihelion | 289.08° |
| Earth MOID | 1.47439 AU (220.566 Gm) |
| Jupiter MOID | 1.99981 AU (299.167 Gm) |
| TJupiter | 3.254 |
| Physical characteristics | |
| Mean radius | 34.62±2.2 km |
| Synodic rotation period | 5.744 h (0.2393 d) |
| Geometric albedo | 0.1495±0.021 |
| Spectral type | S |
| Absolute magnitude (H) | 8.48 |
174 Phaedra is a sizable, rocky main belt asteroid that was discovered by Canadian-American astronomer James Craig Watson on September 2, 1877, and named after Phaedra, the tragic lovelorn queen in Greek mythology.
The asteroid is orbiting the Sun with a period of 4.84 years and an eccentricity of 0.14. Lightcurve data obtained from Phaedra indicates a rather irregular or elongated body. It has a cross-section size of ~35 km. Photometric observations of this asteroid at the Shadowbox Observatory in Carmel, Indiana, during 2009 gave a light curve with a period of 4.96 ± 0.01 hours. This is consistent with previous studies in 1977, 1988, and 2008. The asteroid's pole of rotation lies just 5–16° away from the plane of the ecliptic.
References
- Noah Webster (1884) A Practical Dictionary of the English Language
- Yeomans, Donald K., "174 Phaedra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
- Ruthroff, John C. (July 2009), "Photometric Observations and Lightcurve Analysis of Asteroids 129 Antigone, 174 Phaedra, 232 Russia, 291 Alice, and 343 Ostara", The Minor Planet Bulletin, 36 (3): 121–122, Bibcode:2009MPBu...36..121R.
- Marciniak, A.; et al. (May 2011), "Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids", Astronomy & Astrophysics, 529: 14, Bibcode:2011A&A...529A.107M, doi:10.1051/0004-6361/201015365, A107
External links
- 174 Phaedra at AstDyS-2, Asteroids—Dynamic Site
- 174 Phaedra at the JPL Small-Body Database
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