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JPL Small-Body Database Browser
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954 Li (A921 PC)
Classification: Main-belt Asteroid          SPK-ID: 2000954
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1732127248914744 3.7069e-08  
a 3.128905072110384 1.4325e-08 au
q 2.58693889864339 1.1651e-07 au
i 1.169560327210819 4.4144e-06 deg
node 163.2423870471129 0.00018621 deg
peri 151.3580181939354 0.0001866 deg
M 212.5264391841127 1.4466e-05 deg
tp 2459428.630297221909
(2021-Aug-02.13029722)
8.4228e-05 TDB
period 2021.561731814982
5.53
1.3883e-05
3.801e-08
d
yr
n .1780801418697157 1.223e-09 deg/d
Q 3.670871245577379 1.6806e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3026  
   data-arc span      41469 days (113.54 yr)  
   first obs. used      1905-10-26  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46789  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:16:37  

Additional Information
 Earth MOID = 1.57237 au 
 Jupiter MOID = 1.62102 au 
 T_jup = 3.190 
[ 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 9.94   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
diameter diameter 58.771 km 0.474 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.207 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Shevchenko, V.G.; Chiorny, V.G.; Gaftonyuk, M.; Krugly, Y.N.; et al. (2008) Icarus 196, 601-611.]
geometric albedo albedo 0.060   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.625   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.04, mean=5.24, max.=8.44) deg.
U-B UB 0.310   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.04, mean=5.24, max.=8.44) deg.
Tholen spectral type spec_T FCX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

954 Li (A921 PC)          Discovered 1921-Aug-04 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A921 PC = 1943 PE = 1952 BE2 = A905 UN = A920 GC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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