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JPL Small-Body Database Browser
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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 71 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2473380112823969 3.6561e-08  
a 2.653594415180581 9.6345e-09 au
q 1.997259649779741 9.5642e-08 au
i 14.92813782594492 4.5189e-06 deg
node 218.1877989147454 1.6415e-05 deg
peri 227.5850021572321 1.8698e-05 deg
M 136.175563001041 1.0772e-05 deg
tp 2458003.262701531627
(2017-Sep-06.76270153)
4.6037e-05 TDB
period 1578.88407222499
4.32
8.5988e-06
2.354e-08
d
yr
n .2280091403371255 1.2418e-09 deg/d
Q 3.309929180581421 1.2017e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2415  
   data-arc span      38678 days (105.89 yr)  
   first obs. used      1913-11-27  
   last obs. used      2019-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .33345  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:57:17  

Additional Information
 Earth MOID = 1.04207 au 
 Jupiter MOID = 2.10749 au 
 T_jup = 3.298 
[ 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 10.49   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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. 2019-January); 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]
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

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Alternate Designations
 A913 WB = 1958 HA 
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