Astronomy:804 Hispania
| Discovery | |
|---|---|
| Discovered by | J. Comas Solá |
| Discovery date | 20 March 1915 |
| Designations | |
| (804) Hispania | |
| Pronunciation | /hɪˈspeɪniə/[1][2] |
| Named after | Spain |
| 1915 WT | |
| Minor planet category | 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) |
| |{{{apsis}}}|helion}} | 3.2343 astronomical unit|AU (483.84 Gm) |
| |{{{apsis}}}|helion}} | 2.4418 AU (365.29 Gm) |
| 2.8381 AU (424.57 Gm) | |
| Eccentricity | 0.13961 |
| Orbital period | 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[citation needed] |
| Mean radius | 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 |
| Rotation period | 14.845 h (0.6185 d)[3] 7.405±0.010 h[5] |
| Geometric albedo | 0.0520±0.004 |
| Physics | ~167.4K |
| P | |
| Absolute magnitude (H) | 7.84 |
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.
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
- ↑ Webster, Noah (1884), A Practical Dictionary of the English Language
- ↑ 2.0 2.1 Hispanian (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Hispanian (Subscription or UK public library membership required.)
- ↑ 3.0 3.1 3.2 "804 Hispania (1915 WT)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=804;cad=1.
- ↑ 4.0 4.1 4.2 4.3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. 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, doi:10.1051/0004-6361:20010114, Bibcode: 2001A&A...369..305C.
- ↑ 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 185 (1): pp. 39–63, doi:10.1016/j.icarus.2006.06.001, PMID 19081813, PMC 2600456, Bibcode: 2006Icar..185...39M, http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006Icar..185...39M&link_type=EJOURNAL&db_key=AST&high=, retrieved 2013-03-27.
External links
- 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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