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 | |
| (804) Hispania | |
| Pronunciation | /hɪˈspeɪniə/[1][2] |
Named after | Spain |
| 1915 WT | |
| Main belt | |
| Adjectives | Hispanian[2] |
| Orbital characteristics[3] | |
| 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) |
| 2.8381 AU (424.57 Gm) | |
| Eccentricity | 0.13961 |
| 4.78 yr (1746.3 d) | |
Average orbital speed | 17.60 km/s |
| 277.552° | |
| 0° 12m 22.104s / day | |
| Inclination | 15.395° |
| 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[citation needed] |
| 78.79±2.9 km[3] 74.125±2.04 km[4] | |
| Mass | (5.00±1.78)×1018 kg[4] |
Mean density | 2.93±1.06 g/cm3[4] |
Equatorial surface gravity | ~0.107m/s2 |
Equatorial escape velocity | ~129.9m/s |
| 14.845 h (0.6185 d)[3] 7.405±0.010 h[5] | |
| 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.[6] 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.[7] 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.[4]
References
edit- ^ Webster, Noah (1884), A Practical Dictionary of the English Language
- ^ a b "Hispanian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c "804 Hispania (1915 WT)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016.
- ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ^ Calabresi, M.; Roselli, G. (April 2001), "The rotation period of 804 Hispania: Some considerations on its nature", Astronomy and Astrophysics, 369: 305–307, Bibcode:2001A&A...369..305C, doi:10.1051/0004-6361:20010114.
- ^ Busarev, V. V.; Taran, M. N. (November 2002), "On the spectral similarity of carbonaceous chondrites and some hydrated and oxidized asteroids", Asteroids, Comets, and Meteors, 500: 933–936, Bibcode:2002ESASP.500..933B.
- ^ Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, vol. 185, no. 1, pp. 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813, retrieved 27 March 2013.
External links
edit- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 804 Hispania at AstDyS-2, Asteroids—Dynamic Site
- 804 Hispania at the JPL Small-Body Database
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