|Discovered by||Paul Henry and Prosper Henry|
|Discovery date||September 11, 1872|
|Minor planet category||Main belt
|Epoch December 31, 2006 (JD 2454100.5)|
|Aphelion||443.561 Gm (2.965 AU)|
|Perihelion||376.865 Gm (2.519 AU)|
|Semi-major axis||410.213 Gm (2.742 AU)|
|Orbital period||1658.534 d (4.54 a)|
|Average orbital speed||17.96 km/s|
|Longitude of ascending node||169.160°|
|Argument of perihelion||110.210°|
|Mean density||2.0 g/cm³|
|Equatorial surface gravity||0.0122 m/s²|
|Escape velocity||0.0231 km/s|
|Rotation period||3.968 h|
|Albedo||0.1305 ± 0.0269|
|Spectral type||M (Tholen)|
|Absolute magnitude (H)||8.90|
Discovery and name
It was discovered by Prosper Henry on September 11, 1872 from Paris. Some sources give Paul Henry sole credit 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.
- Yeomans, Donald K., "125 Liberatrix", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
- Pravec, P. et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16-20, 2012 in Niigata, Japan (1667), Bibcode:2012LPICo1667.6089P.
- Durech, J. et al. (April 2007), "Physical models of ten asteroids from an observers' collaboration network", Astronomy and Astrophysics 465 (1): 331–337, Bibcode:2007A&A...465..331D, doi:10.1051/0004-6361:20066347.
- Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
- Durech, J.; Kaasalainen, M.; Marciniak, A.; Allen, W. H. et al. "Asteroid brightness and geometry," Astronomy and Astrophysics, Volume 465, Issue 1, April I 2007, pp. 331-337.
- Hardersen, Paul S.; Gaffey, Michael J.; Abell, Paul A. (January 1983), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids", Icarus 175 (1): 141-158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017, retrieved 2013-03-30.
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