804 Hispania
804 Hispania is a minor planet orbiting the Sun. It was discovered from Barcelona (Spain) on 20 March 1915 by Josep Comas Solá (1868–1937), the first asteroid to be discovered by a Spaniard.
| Discovery | |
|---|---|
| Discovered by | J. Comas Solá |
| Discovery date | 20 March 1915 |
| Designations | |
MPC designation | (804) Hispania |
| Pronunciation | /hɪˈspeɪniə/ |
Named after | Spain |
Alternative designations | 1915 WT |
Minor planet category | Main belt |
| Adjectives | Hispanian |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 39,655 d (108.57 yr) |
| Aphelion | 3.2343 AU (483.84 Gm) |
| Perihelion | 2.4418 AU (365.29 Gm) |
Semi-major axis | 2.8381 AU (424.57 Gm) |
| Eccentricity | 0.13961 |
Orbital period (sidereal) | 4.78 yr (1746.3 d) |
Average orbital speed | 17.60 km/s |
Mean anomaly | 277.552° |
Mean motion | 0° 12m 22.104s / day |
| Inclination | 15.395° |
Longitude of ascending node | 347.611° |
| 344.626° | |
| Earth MOID | 1.43481 AU (214.645 Gm) |
| Jupiter MOID | 2.16034 AU (323.182 Gm) |
| TJupiter | 3.244 |
| Physical characteristics | |
| Dimensions | 157.30 km |
Mean radius | 78.79±2.9 km 74.125±2.04 km |
| Mass | (5.00±1.78)×1018 kg |
Mean density | 2.93±1.06 g/cm3 |
Equatorial surface gravity | ~0.107m/s2 |
Equatorial escape velocity | ~129.9m/s |
Synodic rotation period | 14.845 h (0.6185 d) 7.405±0.010 h |
| 0.0520±0.004 | |
| Temperature | ~167.4K |
| P | |
| 7.84 | |
Hispania is a carbonaceous C-type asteroid. Busarev and Taran (2002) classed it as CP type with a spectrum that shows a highly hydrated body. It has a diameter of 122 kilometers according to measurements made with the W. M. Keck Observatory. This is 30% smaller than the size estimated from the IRAS observatory data. It has a size ratio of 1.16 between its major and minor axes. Two alternate rotation periods have been found for this asteroid: 7.4 hours and double that at 14.8 hours. To explain this discrepancy, it is possible the asteroid has a peculiar shape or it may be a double asteroid.