|Discovered by||Paul Henry and Prosper Henry|
|Discovery date||11 September 1872|
|Epoch 31 July 2016 (JD 2457600.5)|
|Uncertainty parameter 0|
|Observation arc||143.54 yr (52428 d)|
|Aphelion||2.95698 AU (442.358 Gm)|
|Perihelion||2.53084 AU (378.608 Gm)|
|2.74391 AU (410.483 Gm)|
|4.55 yr (1660.2 d)|
Average orbital speed
|0° 13m 0.642s / day|
|Earth MOID||1.51912 AU (227.257 Gm)|
|Jupiter MOID||2.13019 AU (318.672 Gm)|
Equatorial surface gravity
Equatorial escape velocity
|3.968 h (0.1653 d)|
0.1305 ± 0.0269
Liberatrix (minor planet designation: 125 Liberatrix) is a main-belt asteroid. It has a relatively reflective surface and an M-type spectrum. Liberatrix is a member of an asteroid family bearing its own name.
It was discovered by Prosper Henry on September 11, 1872, from Paris. Some sources give Paul Henry sole cr for its discovery. The asteroid's name is a feminine version of the word "liberator". Henry may have chosen the name to mark the liberation of France from Prussia during the Franco-Prussian War in 1870. More specifically, it may honor Adolphe Thiers, the first President of the French Republic, who arranged a loan that enabled the Prussian troops to be removed from France.
In the late 1990s, a network of astronomers worldwide gathered lightcurve data to derive the spin states and shape models of 10 asteroids, including Liberatrix. Liberatrix's lightcurve has a large amplitude of 0.4 in magnitude, indicating an elongated or irregular shape.
The spectrum of this asteroid matches a M-type asteroid. It may be the remnant of an asteroid that had undergone differentiation, with orthopyroxene minerals scattered evenly across the surface. There is no indication of hydration.
To date, there have been at least two observed occultations by Liberatrix. Early on December 11, 2014, Liberatrix occulted a 9th magnitude star and will be visible over the majority of Southern California and a swath of Mexico.