110 Lydia

110 Lydia
Lightcurve-based 3D-model of Lydia
Discovery
Discovered byAlphonse Borrelly
Discovery date19 April 1870
Designations
(110) Lydia
Pronunciation/ˈlɪdiə/[1]
Named after
Lydia
A870 HA; 1899 VA; 1972 YS1
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc145.80 yr (53,255 d)
Aphelion2.9539 AU (441.90 Gm)
Perihelion2.51115 AU (375.663 Gm)
2.7325 AU (408.78 Gm)
Eccentricity0.081021
4.52 yr (1649.9 d)
17.99 km/s
348.344°
0° 13m 5.52s / day
Inclination5.9645°
56.871°
283.499°
TJupiter3.341
Physical characteristics
Dimensions
Mass6.7×1017 kg
Equatorial surface gravity
0.0241 m/s2
Equatorial escape velocity
0.0455 km/s
  • 10.927 h (0.4553 d)[2]
  • 10.9258 hours[4]
Temperature~168 K
7.80[2][3]

110 Lydia is a large belt asteroid with an M-type spectrum,[5] and thus may be metallic in composition, consisting primarily of nickel-iron. It was discovered by French astronomer Alphonse Borrelly on 19 April 1870[6] and was named for Lydia, the Asia Minor country populated by Phrygians.[7] 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.[8] 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.[4]

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.[9] 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%).[10] 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.[3] It is a likely interloper in the Padua family of minor planets that share similar dynamic properties.[11]

Lydia occulted a dim star on 18 September 1999.

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d e Cite error: The named reference JPL was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Delbo2009 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Durech2007 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference DeMeo2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference IAU_MPC was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference lutz2003 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Taylor1971 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference DeMeo2009 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Hardersen1983 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Carruba2009 was invoked but never defined (see the help page).