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78 Diana

Main-belt asteroid

Field	Value
minorplanet	yes
background	#D6D6D6
name	78 Diana
discoverer	Karl Theodor Robert Luther
discovered	March 15, 1863
mpc_name	(78) Diana
image	Орбита астероида 78.png
caption	Orbital diagram
pronounced
adjective	Dianian ( )
named_after	Diāna (Roman mythology)
mp_category	Main belt
epoch	December 31, 2006 (JD 2454100.5)
orbit_ref
semimajor	391.934 Gm
perihelion	310.686 Gm
aphelion	473.182 Gm
eccentricity	0.207
period	1548.922 days
inclination	8.688°
asc_node	333.582°
arg_peri	151.423°
mean_anomaly	353.808°
avg_speed	18.20 km/s
dimensions
mass
density	1.28 g/cm3
rotation	7.2991 h
spectral_type	C
abs_magnitude	8.09
albedo	0.071

78 Diana is a large and dark main-belt asteroid. It was discovered by German astronomer Robert Luther on March 15, 1863, and named after Diana, Roman goddess of the hunt. The asteroid is orbiting the Sun at a distance of 391.934 Gm with a period of 4.24 years and an eccentricity (ovalness) of 0.207. The orbital plane is tilted at an angle of 8.688° relative to the plane of the ecliptic. Its composition is carbonaceous and primitive.

Photometric observations of this asteroid during 1986 and 2006–08 gave a light curve with a rotation period of 7.2991 hours and a brightness variation in the range 0.02–0.104 magnitude. Based upon radar data, the near surface solid density of the asteroid is 2.7g cm−3. 78 Diana occulted a star on September 4, 1980. A diameter of 116 km was measured, closely matching the value given by the IRAS satellite.

Diana is expected to pass about 0.003 AU from (29075) 1950 DA on August 5, 2150. Main-belt asteroid 4217 Engelhardt (~9 km in diameter) will pass about 0.0017 AU from (29075) 1950 DA in 2736.

References

{{OED. Diana
"Asteroid Data Sets".

Info: Wikipedia Source

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background-asteroids discoveries-by-robert-luther named-minor-planets c-type-asteroids-(tholen) ch-type-asteroids-(smass) astronomical-objects-discovered-in-1863

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