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771 Libera (A913 WB)
Classification: Main-belt Asteroid          SPK-ID: 2000771
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 80 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2468913436064772 2.1844e-08  
a 2.652828782229736 8.9626e-09 au
q 1.997868319827101 5.896e-08 au
i 14.88685990569206 7.6674e-07 deg
node 217.8849161859707 2.7632e-06 deg
peri 228.438410294923 4.5972e-06 deg
M 272.1161864792458 8.107e-06 deg
tp 2459585.773067952365
(2022-Jan-06.27306795)
3.6678e-05 TDB
period 1578.20079610106
4.32
7.9979e-06
2.19e-08
d
yr
n .2281078560404853 1.156e-09 deg/d
Q 3.30778924463237 1.1175e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3077  
   data-arc span      39126 days (107.12 yr)  
   first obs. used      1913-11-27  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3184  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:24:58  

Additional Information
 Earth MOID = 1.04325 au 
 Jupiter MOID = 2.11168 au 
 T_jup = 3.299 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.31   n/a E2021B10 IRAS observations used: 6
diameter diameter 29.322 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.892 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Warner, B.D. (2000) Minor Planet Bull. 27, 4-6.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marciniak, A.; Michalowski, T.; Hirsch, R.; Behrend, R.; et al. (2009) Astron. Astrophys. 508, 1503-1507.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.123   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.687   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.37, mean=11.17, max.=16.97) deg.
U-B UB 0.300   0.070 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.37, mean=11.17, max.=16.97) deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

771 Libera (A913 WB)          Discovered 1913-Nov-21 by Rheden, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A913 WB = 1958 HA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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