804 Hispania

804 Hispania

Discovery
Discovered by	J. Comas Solá
Discovery date	20 March 1915
Designations
Named after	Spain
Alternative names	1915 WT
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	108.57 yr (39655 d)
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	4.78 yr (1746.3 d)
Average orbital speed	17.60 km/s
Mean anomaly	277.552°
Mean motion	0° 12^m 22.104^s / day
Inclination	15.395°
Longitude of ascending node	347.611°
Argument of perihelion	344.626°
Earth MOID	1.43481 AU (214.645 Gm)
Jupiter MOID	2.16034 AU (323.182 Gm)
Jupiter Tisserand parameter	3.244
Physical characteristics
Dimensions	157.30 km
Mean radius	78.79±2.9 km[1] 74.125 ± 2.04 km[2]
Mass	(5.00 ± 1.78) × 10^18 kg[2] 9.95×10^18
Mean density	2.93 ± 1.06 g/cm^3[2] 4.90 g/cm³
Equatorial surface gravity	~0.107m/s^2
Equatorial escape velocity	~129.9m/s
Rotation period	14.845 h (0.6185 d)[1] 7.405 hr[3]
Geometric albedo	0.0520±0.004
Temperature	~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.

This is a C-type carbonaceous asteroid. Measurements made with adaptive optics at the W. M. Keck Observatory put the size of this object at 122 km. 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.^[4]

References

1. "804 Hispania (1915 WT)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016.
2. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
4. 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, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813, retrieved 2013-03-27.

External links

• Discovery Circumstances: Numbered Minor Planets
• 804 Hispania at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters