206 Hersilia

206 Hersilia

Discovery
Discovered by	C. H. F. Peters
Discovery date	October 13, 1879
Designations
Named after	Hersilia
Alternative names	1961 WG, 1974 PM
Minor planet category	Main belt
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion	426.626 Gm (2.852 AU)
Perihelion	393.121 Gm (2.628 AU)
Semi-major axis	409.873 Gm (2.74 AU)
Eccentricity	0.041
Orbital period	1656.444 d (4.54 a)
Average orbital speed	17.99 km/s
Mean anomaly	153.721°
Inclination	3.781°
Longitude of ascending node	145.281°
Argument of perihelion	302.608°
Physical characteristics
Dimensions	104.6 km
Mass	unknown
Mean density	unknown
Surface gravity	unknown
Escape velocity	unknown
Rotation period	7.330 h
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.^[1]

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

References

1. Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", eprint arXiv, arXiv:1204.1116, Bibcode:2012arXiv1204.1116R.

External links

• The Asteroid Orbital Elements Database
• Minor Planet Discovery Circumstances
• Asteroid Lightcurve Parameters
• Asteroid Albedo Compilation
• 206 Hersilia at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters