445 Edna

Edna (minor planet designation: 445 Edna) is a large Main belt asteroid.

445 Edna

Discovery
Discovered by	E. F. Coddington
Discovery date	2 October 1899
Designations
MPC designation	(445) Edna
Pronunciation	/ˈɛdnə/[1]
Alternative designations	1899 EX
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	116.53 yr (42563 d)
Aphelion	3.82552 AU (572.290 Gm)
Perihelion	2.57569 AU (385.318 Gm)
Semi-major axis	3.20060 AU (478.803 Gm)
Eccentricity	0.19525
Orbital period	5.73 yr (2091.4 d)
Mean anomaly	190.102°
Mean motion	0° 10^m 19.668^s / day
Inclination	21.2944°
Longitude of ascending node	292.111°
Argument of perihelion	81.2763°
Physical characteristics
Dimensions	87.17±2.1 km[2] 88.60 ± 4.10 km[3]
Mass	(3.47 ± 0.78) × 10^18 kg[3]
Mean density	9.52 ± 2.50 g/cm^3[3]
Rotation period	19.97 h (0.832 d)
Geometric albedo	0.0447±0.002
Absolute magnitude (H)	9.29

It was discovered by E. F. Coddington on October 2, 1899, at Mount Hamilton, California. It was the astronomers third and final asteroid discovery.

References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. "445 Edna (1899 EX)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 10 May 2016.
3. 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.

External links

• 445 Edna at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 445 Edna at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters