426 Hippo

426 Hippo

Discovery
Discovered by	Auguste Charlois
Discovery date	August 25, 1897
Designations
Named after	Hippo Regius
Alternative names	1897 DH
Minor planet category	Main belt
Orbital characteristics
Epoch November 4, 2013
Aphelion	3.1880 AU (476.92 Gm)
Perihelion	2.5906 AU (387.55 Gm)
Semi-major axis	2.8893 AU (432.23 Gm)
Eccentricity	0.1034
Orbital period	4.91 yr
Average orbital speed	17.53 km/s
Mean anomaly	47.4380°
Inclination	19.4779°
Longitude of ascending node	311.434°
Argument of perihelion	221.982°
Proper orbital elements[1]
Proper semi-major axis	2.88928 AU
Proper eccentricity	0.179526
Proper inclination	20.3798°
Proper mean motion	73.2862 deg / yr
Proper orbital period	4.91225 yr (1794.199 d)
Precession of perihelion	32.8357 arcsec / yr
Precession of the ascending node	−59.8571 arcsec / yr
Physical characteristics
Dimensions	127.1 km[2]
Rotation period	1.4292 Earth days
Albedo	0.0469[2]
Temperature	154-171 K
Spectral type	F
Absolute magnitude (H)	8.42[2]

426 Hippo is a rather large main-belt asteroid. It was discovered by Auguste Charlois on August 25, 1897, in Nice. In the 22nd century, it will come closer than 6,000,000 km (0.04 AU) to the larger asteroids 65 Cybele and 511 Davida.^[2]

References

1. "AstDyS-2 (426) Hippo Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 2014-02-09.
2. "JPL Small-Body Database Browser: 426 Hippo (1897 DH)" (2013-06-21 last obs). Jet Propulsion Laboratory. Retrieved 2014-02-09.

External links

http://ssd.jpl.nasa.gov/sbdb.cgi?orb=1;sstr=426

• 426 Hippo at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters