804 Hispania
Discovery
Discovered byJ. Comas Solá
Discovery date20 March 1915
Designations
(804) Hispania
Pronunciation/hɪˈspniə/[1][2]
Named after
Spain
1915 WT
Main belt
AdjectivesHispanian[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc39,655 d (108.57 yr)
Aphelion3.2343 AU (483.84 Gm)
Perihelion2.4418 AU (365.29 Gm)
2.8381 AU (424.57 Gm)
Eccentricity0.13961
4.78 yr (1746.3 d)
17.60 km/s
277.552°
0° 12m 22.104s / day
Inclination15.395°
347.611°
344.626°
Earth MOID1.43481 AU (214.645 Gm)
Jupiter MOID2.16034 AU (323.182 Gm)
TJupiter3.244
Physical characteristics
Dimensions157.30 km
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
14.845 h (0.6185 d)[3]
7.405±0.010 h[5]
0.0520±0.004
Temperature~167.4K
P
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. 1 2 "Hispanian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. 1 2 3 "804 Hispania (1915 WT)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016.
    4. 1 2 3 4 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.
    5. 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.
    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, 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.


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