110 Lydia
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110 Lydia is a large belt asteroid with an M-type spectrum,<ref name="DeMeo2011"/> and thus may be metallic in composition, consisting primarily of nickel-iron. It was discovered by French astronomer Alphonse Borrelly on 19 April 1870<ref name="IAU_MPC"/> and was named for Lydia, the Asia Minor country populated by Phrygians.<ref name=lutz2003/> 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.<ref name="Taylor1971"/> 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.<ref name="Durech2007"/>
In the Tholen classification system, it is categorized as an M-type asteroid, while the Bus asteroid taxonomy system lists it as an Xk asteroid.<ref name="DeMeo2009"/> Absorption features in the near infrared are attributed to low-iron, low-calcium orthopyroxene minerals. Water content on the surface is estimated at 0.14–0.27 by mass fraction (wt%).<ref name="Hardersen1983"/> Measurements of the thermal inertia of 110 Lydia give a value between 70 and Template:Nowrap, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.<ref name="Delbo2009"/> It is a likely interloper in the Padua family of minor planets that share similar dynamic properties.<ref name="Carruba2009"/>
Lydia occulted a dim star on 18 September 1999.
References
External links
- Lightcurve plot of 110 Lydia, Palmer Divide Observatory, B. D. Warner (2012)
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdRTemplate:Snd Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)–(5000)Template:Snd Minor Planet Center
- Template:AstDys
- Template:JPL small body
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