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JPL Small-Body Database Browser
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81 Terpsichore
Classification: Main-belt Asteroid          SPK-ID: 2000081
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2108473534033551 3.5082e-08  
a 2.853711594093838 7.8652e-09 au
q 2.252014057102683 9.9075e-08 au
i 7.803141116878059 4.2564e-06 deg
node .9479456288507462 2.24e-05 deg
peri 51.6342740353516 2.4113e-05 deg
M 69.00207361011158 9.2238e-06 deg
tp 2458663.000458045199
4.4344e-05 TDB
period 1760.81425886198
n .2044508659491826 8.4524e-10 deg/d
Q 3.455409131084993 9.5236e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3303  
   data-arc span      56688 days (155.20 yr)  
   first obs. used      1864-11-19  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38209  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:16:41  

Additional Information
 Earth MOID = 1.27219 au 
 Jupiter MOID = 2.0061 au 
 T_jup = 3.258 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.6   n/a MPO502153 IRAS observations used: 32
diameter diameter 117.727 km 0.734 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 10.943 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Zeigler, K.W. (1990) Minor Planet Bull. 17, 1-3.]
[Fauerbach, M.; Bennett, T.; Marks, S.A. (2007) Minor Planet Bull. 34, 57-58.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 45-46.]
[Pilcher, F. (2011) Minor Planet Bull. 38, 156-158.]
geometric albedo albedo 0.045   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.701   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=2.09, mean=9.43, max.=12.17) deg.
U-B UB 0.346   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=2.09, mean=9.43, max.=12.17) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Cb   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)

81 Terpsichore          Discovered 1864-Sep-30 by Tempel, E. W. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1936 QR = 1936 RK = 1974 LF = A909 AA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Feb-24 21:08 UT
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