206 Hersilia

206 Hersilia
	3D convex shape model of 206 Hersilia
Discovery
Discovered by	C. H. F. Peters
Discovery date	13 October 1879
Designations
MPC designation	(206) Hersilia
Pronunciation	/hərˈsɪliə/
Named after	Hersilia
Alternative designations	A879 TC, 1961 WG; 1974 PM
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	136.34 yr (49798 d)
Aphelion	2.84299 AU (425.305 Gm)
Perihelion	2.63811 AU (394.656 Gm)
Semi-major axis	2.74055 AU (409.980 Gm)
Eccentricity	0.037379
Orbital period (sidereal)	4.54 yr (1657.1 d)
Average orbital speed	17.99 km/s
Mean anomaly	348.975°
Mean motion	0° 13m 2.078s / day
Inclination	3.77868°
Longitude of ascending node	145.169°
Argument of perihelion	299.705°
Physical characteristics
Dimensions	113 km
Synodic rotation period	11.122 h (0.4634 d)
Geometric albedo	0.055
Temperature	unknown
Spectral type	C
Absolute magnitude (H)	8.68

206 Hersilia is a fairly large Main belt asteroid. It was discovered by C. H. F. Peters on October 13, 1879, in Clinton, New York. The asteroid was named after Hersilia, Roman wife of Romulus. It is classified as a primitive, dark carbon-rich C-type asteroid.

Measurements made with the IRAS observatory give a diameter of 101.72 ± 5.18 km and a geometric albedo of 0.06 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 97.99 ± 7.40 km and a geometric albedo of 0.06 ± 0.02.^[3]

The last close earth transit was in November and December 2002.

References

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ "206 Hersilia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv:1204.1116 [astro-ph.EP]

External links

The Asteroid Orbital Elements Database
Asteroid Lightcurve Parameters
Asteroid Albedo Compilation
206 Hersilia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
206 Hersilia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[jpldata-2] "206 Hersilia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[2012arXiv1204-3] Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv:1204.1116 [astro-ph.EP]

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