804 Hispania

804 HispaniaDiscovery

Discovered by| J. Comas Solá
Discovery date| 20 March 1915
Designations

MPC designation

| (804) Hispania
Pronunciation| /hɪˈspeɪniə/[1][2]
Named after| Spain

Alternative designations

| 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)

Semi-major axis

| 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°

|{{{apsis}}}|helion}}

| 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

Spectral type

| 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

1. ↑ Webster, Noah (1884), A Practical Dictionary of the English Language
2. ↑ 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. ↑ 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. ↑ 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.
5. ↑ 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.
6. ↑ 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.
7. ↑ 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
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 804 Hispania at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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