125 Liberatrix

125 Liberatrix
	A three-dimensional model of 125 Liberatrix based on its light curve.
Discovery
Discovered by	Paul Henry and Prosper Henry
Discovery date	11 September 1872
Designations
MPC designation	(125) Liberatrix
Pronunciation	/ˈlɪbəreɪtrɪks/
Alternative designations	A872 RA; 1902 EG;; 1943 FE; 1949 OE1;; 1949 SM; 1954 TD1
Minor planet category	Main belt; (liberatrix)
Orbital characteristics
	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)
Semi-major axis	2.74391 AU (410.483 Gm)
Eccentricity	0.077651
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
Inclination	4.66407°
Longitude of ascending node	169.003°
Argument of perihelion	109.288°
Earth MOID	1.51912 AU (227.257 Gm)
Jupiter MOID	2.13019 AU (318.672 Gm)
TJupiter	3.340
Physical characteristics
Dimensions	43.58±2.3 km; 61.058 km
Mass	8.7×1016 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)
Geometric albedo	0.2253±0.026; 0.1305 ± 0.0269
Temperature	~168 K
Spectral type	M (Tholen)
Absolute magnitude (H)	9.04, 8.90

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.

Quick Facts Discovery, Discovered by ...

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It was discovered by Prosper Henry on 11 September 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 11 December 2014, Liberatrix occulted a 9th magnitude star and will be visible over the majority of Southern California and a swath of Mexico.^{[citation needed]}

[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.

125 Liberatrix at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
125 Liberatrix at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[1] [1]
"liberatrix". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.

[JPL-2] [2]
Yeomans, Donald K., "125 Liberatrix", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Pravec2012-3] [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.

[Durech2007-4] [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.

[Lutz-5] [5]
Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.

[6] [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.

[Hardersen1983-7] [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.

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References

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