110 Lydia is a large asteroid belt, belt asteroid with an M-type asteroid, M-type spectrum, and thus may be metallic in composition, consisting primarily of nickel-iron. It was discovered by French astronomer Alphonse Borrelly on 19 April 1870 and was named for Lydia, the Anatolia, Asia Minor country populated by Phrygians. The Lydia family of asteroids is named after it. Observations made during 1958–1959 at the McDonald Observatory and in 1969 at the Kitt Peak National Observatory found an uneven light curve with a period of 10.9267 hours. In the late 1990s, a network of astronomers worldwide used light curves to derive spin states and shape models of 10 new asteroids, including (110) Lydia. They obtained a period of 10.92580 hours, with the brightness varying by no more than 0.2 in Magnitude (astronomy), magnitude. In the Tholen classification system, it is categorized as an M-type asteroid, while the Bus asteroid taxonomy system lists it as an X-type asteroid, Xk asteroid. Absorption features in the near infrared are attributed to low-iron, low-calcium Orthopyroxenite, orthopyroxene minerals. Water content on the surface is estimated at 0.14–0.27 by Mass fraction (chemistry), mass fraction (wt%). Measurements of the thermal inertia of 110 Lydia give a value between 70 and , compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere. It is a likely interloper in the 363 Padua, Padua Asteroid family, family of minor planets that share similar dynamic properties. Lydia occultation, occulted a dim star on 18 September 1999.

References

External links

Lightcurve plot of 110 Lydia
Palmer Divide Observatory, ''Brian D. Warner, B. D. Warner'' (2012)
Asteroid Lightcurve Database (LCDB)
query form

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Dictionary of Minor Planet Names
Google books

Observatoire de Genève, Raoul Behrend

Minor Planet Center * * {{DEFAULTSORT:Lydia Padua asteroids, 000110 Discoveries by Alphonse Borrelly Named minor planets Objects observed by stellar occultation, 000110 M-type asteroids (Tholen), 000110 X-type asteroids (SMASS), 000110 Astronomical objects discovered in 1870, 18700419