A three-dimensional model of 110 Lydia based on its light curve.
|Discovered by||Alphonse Borrelly|
|Discovery date||April 19, 1870|
|Minor planet category||Main belt, lydia family|
|Epoch December 31, 2006 (JD 2454100.5)|
|Aphelion||440.756 Gm (2.946 AU)|
|Perihelion||377.016 Gm (2.520 AU)|
|Semi-major axis||408.886 Gm (2.733 AU)|
|Orbital period||1650.493 d (4.52 a)|
|Average orbital speed||17.99 km/s|
|Longitude of ascending node||56.993°|
|Argument of perihelion||281.953°|
|Equatorial surface gravity||0.0241 m/s²|
|Escape velocity||0.0455 km/s|
|Rotation period||10.9258 hours|
|Spectral type||M (Tholen)
Xk (DeMeo et al)
|Absolute magnitude (H)||7.80|
110 Lydia is a large main-belt asteroid with an M-type spectrum, and thus may be metallic in composition, consisting primarily of nickel-iron. It was discovered by French astronomer Alphonse Borrelly on April 19, 1870 and was named for the 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.
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. 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%). Measurements of the thermal inertia of 110 Lydia give a value between 70 and 200 J m−2 K−1 s–1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere. It is a likely interloper in the Padua family of minor planets that share similar dynamic properties.
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