771 Libera

771 Libera
	Modelled shape of Libera from its lightcurve
Discovery
Discovered by	J. Rheden
Discovery site	Vienna Observatory
Discovery date	21 November 1913
Designations
MPC designation	(771) Libera
Pronunciation	Classically /ˈlɪbərə/
Named after	friend of discoverer
Alternative designations	1913 TO · 1958 HA
Minor planet category	main-belt · (middle)
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	101.75 yr (37166 d)
Aphelion	3.3092 AU (495.05 Gm)
Perihelion	1.9937 AU (298.25 Gm)
Semi-major axis	2.6514 AU (396.64 Gm)
Eccentricity	0.24808
Orbital period (sidereal)	4.32 yr (1576.9 d)
Mean anomaly	268.14°
Mean motion	0° 13m 41.844s / day
Inclination	14.936°
Longitude of ascending node	218.19°
Argument of perihelion	227.36°
Earth MOID	1.03684 AU (155.109 Gm)
Jupiter MOID	2.11238 AU (316.008 Gm)
TJupiter	3.299
Physical characteristics
Dimensions	29.38±1.1 km (IRAS:6); 28.91±0.72 km; 29.000±1.403 km; 29.33 km (derived)
Mean radius	14.69±0.55 km
Synodic rotation period	5.892±0.002 h; 5.92 h; 5.886±0.001 h; 5.89±0.05 h; 5.890±0.001 h; 5.892 h (0.2455 d)
Geometric albedo	0.1303±0.010 (IRAS:6) ; 0.141±0.008; 0.1299±0.0158; 0.1226 (SIMPS)
Spectral type	B–V = 0.687; U–B = 0.300; X (Tholen), X (SMASS), X
Absolute magnitude (H)	10.49

771 Libera, provisional designation 1913 TO, is a metallic asteroid from the middle region of the asteroid belt, about 29 kilometers in diameter. It was discovered by Austrian astronomer Joseph Rheden at the Vienna Observatory in Austria, on 21 November 1913.^[12]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference jpldata was invoked but never defined (see the help page).
^ Noah Webster (1884) A Practical Dictionary of the English Language
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^ ^a ^b Cite error: The named reference geneva-obs was invoked but never defined (see the help page).
^ Cite error: The named reference Marciniak-2009b was invoked but never defined (see the help page).
^ Cite error: The named reference MPC-Libera was invoked but never defined (see the help page).

[jpldata-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference jpldata was invoked but never defined (see the help page).

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[springer-3] Cite error: The named reference springer was invoked but never defined (see the help page).

[lcdb-4] Cite error: The named reference lcdb was invoked but never defined (see the help page).

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[AKARI-6] Cite error: The named reference AKARI was invoked but never defined (see the help page).

[WISE-7] Cite error: The named reference WISE was invoked but never defined (see the help page).

[Warner-2000a-8] Cite error: The named reference Warner-2000a was invoked but never defined (see the help page).

[Binzel-1987b-9] Cite error: The named reference Binzel-1987b was invoked but never defined (see the help page).

[geneva-obs-10] Cite error: The named reference geneva-obs was invoked but never defined (see the help page).

[Marciniak-2009b-11] Cite error: The named reference Marciniak-2009b was invoked but never defined (see the help page).

[MPC-Libera-12] Cite error: The named reference MPC-Libera was invoked but never defined (see the help page).

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Discovery ^[1]
Modelled shape of Libera from its lightcurve
Discovered by	J. Rheden
Discovery site	Vienna Observatory
Discovery date	21 November 1913
Designations
MPC designation	(771) Libera
Pronunciation	Classically /ˈlɪbərə/^[2]
Named after	friend of discoverer^[3]
Alternative designations	1913 TO · 1958 HA
Minor planet category	main-belt · (middle) ^[4]
Orbital characteristics ^[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	101.75 yr (37166 d)
Aphelion	3.3092 AU (495.05 Gm)
Perihelion	1.9937 AU (298.25 Gm)
Semi-major axis	2.6514 AU (396.64 Gm)
Eccentricity	0.24808
Orbital period (sidereal)	4.32 yr (1576.9 d)
Mean anomaly	268.14°
Mean motion	0° 13^m 41.844^s / day
Inclination	14.936°
Longitude of ascending node	218.19°
Argument of perihelion	227.36°
Earth MOID	1.03684 AU (155.109 Gm)
Jupiter MOID	2.11238 AU (316.008 Gm)
T_Jupiter	3.299
Physical characteristics
Dimensions	29.38±1.1 km (IRAS:6)^[1]^[5] 28.91±0.72 km^[6] 29.000±1.403 km^[7] 29.33 km (derived)^[4]
Mean radius	14.69±0.55 km
Synodic rotation period	5.892±0.002 h^[8] 5.92 h^[9] 5.886±0.001 h^[10] 5.89±0.05 h^[10] 5.890±0.001 h^[11] 5.892 h (0.2455 d)^[1]
Geometric albedo	0.1303±0.010 (IRAS:6)^[1] ^[5] 0.141±0.008^[6] 0.1299±0.0158^[7] 0.1226 (SIMPS)^[4]
Spectral type	B–V = 0.687 U–B = 0.300 X (Tholen), X (SMASS), X ^[4]
Absolute magnitude (H)	10.49^[1]