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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 ]

[ show orbit diagram ]
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
(2019-Jun-28.50045805)
4.4344e-05 TDB
period 1760.81425886198
4.82
7.2796e-06
1.993e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454995.5 (2009-Jun-13.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2069843369955714 3.4959e-08  
q 2.264395706851079 9.8234e-08 au
tp 2455135.580808639300
(2009-Oct-31.08080864)
4.0138e-05 TDB
node 1.052072649321077 2.239e-05 deg
peri 51.22394923378967 2.4183e-05 deg
i 7.803169008292808 4.2512e-06 deg
  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
 Jupiter MOID = 2.0061 au 
 T_jup = 3.258 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.222098786713861E-15 -3.427430509079991E-15 -3.02753849108318E-13 -1.888854410120751E-16 -5.463029586825806E-14 -8.842436326427608E-16
q -3.427430509079991E-15 9.64985992982191E-15 9.182402146266335E-13 2.042861547436689E-15 1.645752262327009E-13 2.575482665495906E-15
tp -3.02753849108318E-13 9.182402146266335E-13 1.611025083232293E-9 -7.485537108213958E-13 3.750298522337534E-10 -6.690502869524054E-13
node -1.888854410120751E-16 2.042861547436689E-15 -7.485537108213958E-13 5.013289456388284E-10 -4.964293781304828E-10 2.067572825856073E-11
peri -5.463029586825806E-14 1.645752262327009E-13 3.750298522337534E-10 -4.964293781304828E-10 5.848290552713247E-10 -2.058674033500497E-11
i -8.842436326427608E-16 2.575482665495906E-15 -6.690502869524054E-13 2.067572825856073E-11 -2.058674033500497E-11 1.807307616967496E-11

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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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 ]
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