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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.

125 Liberatrix
A three-dimensional model of 125 Liberatrix based on its light curve.
Discovery
Discovered byPaul Henry and Prosper Henry
Discovery date11 September 1872
Designations
MPC designation
(125) Liberatrix
Pronunciation/ˈlɪbəreɪtrɪks/[1]
Alternative designations
A872 RA; 1902 EG;
1943 FE; 1949 OE1;
1949 SM; 1954 TD1
Minor planet category
Main belt
(liberatrix)
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc143.54 yr (52428 d)
Aphelion2.95698 AU (442.358 Gm)
Perihelion2.53084 AU (378.608 Gm)
Semi-major axis
2.74391 AU (410.483 Gm)
Eccentricity0.077651
Orbital period (sidereal)
4.55 yr (1660.2 d)
Average orbital speed
17.96 km/s
Mean anomaly
307.971°
Mean motion
0° 13m 0.642s / day
Inclination4.66407°
Longitude of ascending node
169.003°
Argument of perihelion
109.288°
Earth MOID1.51912 AU (227.257 Gm)
Jupiter MOID2.13019 AU (318.672 Gm)
TJupiter3.340
Physical characteristics
Dimensions43.58±2.3 km[2]
61.058 km[3]
Mass8.7×1016 kg
Mean density
2.0 g/cm3
Equatorial surface gravity
0.0122 m/s2
Equatorial escape velocity
0.0231 km/s
Synodic rotation period
3.968 h (0.1653 d)[2][4]
Geometric albedo
0.2253±0.026[2]
0.1305 ± 0.0269[3]
Temperature~168 K
Spectral type
M (Tholen)[3]
Absolute magnitude (H)
9.04,[2] 8.90[3]

    It was discovered by Prosper Henry on September 11, 1872, from Paris. Some sources give Paul Henry sole credit for its discovery.[5] 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.[5]

    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.[4][6]

    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.[7]

    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.


    References


    1. "liberatrix". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
    2. Yeomans, Donald K., "125 Liberatrix", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    3. 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, no. 1667, Bibcode:2012LPICo1667.6089P.
    4. Durech, J.; et al. (April 2007), "Physical models of ten asteroids from an observers' collaboration network", Astronomy and Astrophysics, vol. 465, no. 1, pp. 331–337, Bibcode:2007A&A...465..331D, doi:10.1051/0004-6361:20066347.
    5. Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
    6. 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.
    7. 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, vol. 175, no. 1, pp. 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017.



    На других языках

    [de] (125) Liberatrix

    (125) Liberatrix ist ein Asteroid des Asteroiden-Hauptgürtels, der am 11. September 1872 von Prosper Mathieu Henry entdeckt wurde.
    - [en] 125 Liberatrix

    [es] (125) Liberatrix

    (125) Liberatrix es un asteroide perteneciente al cinturón de asteroides descubierto por Prosper Mathieu Henry el 11 de septiembre de 1872 desde el observatorio de París, Francia. Está posiblemente nombrado en recuerdo de la liberación de Francia en tiempos del descubrimiento.[2]

    [ru] (125) Либератрикс

    (125) Либератрикс (фр. Liberatrix) — астероид главного пояса, который принадлежит к металлическим астероидам спектрального класса M. Он был открыт 11 сентября 1872 года французским астрономом Проспером Анри в Парижской обсерватории и, предположительно, назван в честь освобождения Франции от Пруссии во время франко-прусской войны 1870—1871 гг., или же первого президента французской республики Луи Адольфа Тьера, который организовал займы, позволившие выплатить контрибуцию и тем самым удалить немецкие войска с французской территории[1].


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