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81 Terpsichore (A864 SA)
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 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2108473504144295 3.3777e-08  
a 2.853711594777186 7.5684e-09 au
q 2.25201406617148 9.4791e-08 au
i 7.80314034908354 4.0622e-06 deg
node .9479425233011883 2.1798e-05 deg
peri 51.63427786128141 2.3541e-05 deg
M 69.00207252920957 8.9324e-06 deg
tp 2458663.000463210827
(2019-Jun-28.50046321)
4.2992e-05 TDB
period 1760.814259494445
4.82
7.0049e-06
1.918e-08
d
yr
n .2044508658757461 8.1335e-10 deg/d
Q 3.455409123382891 9.1642e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3591  
   data-arc span      56975 days (155.99 yr)  
   first obs. used      1864-11-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36916  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 19:31:20  

Additional Information
 Earth MOID = 1.27219 au 
 Jupiter MOID = 2.0061 au 
 T_jup = 3.258 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455280.5 (2010-Mar-25.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2070286477763589 3.3642e-08  
q 2.264367004465623 9.3946e-08 au
tp 2455135.756153930478
(2009-Oct-31.25615393)
3.9523e-05 TDB
node 1.05184122139314 2.1788e-05 deg
peri 51.27919220129281 2.3614e-05 deg
i 7.803297713940066 4.0578e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3591  
   data-arc span      56975 days (155.99 yr)  
   first obs. used      1864-11-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36916  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 19:31:20  

Additional Information
 Jupiter MOID = 2.0061 au 
 T_jup = 3.258 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.131750719009155E-15 -3.154643553710824E-15 -2.394645796430188E-13 3.654083668802589E-16 -4.749598354337976E-14 -7.85963974933841E-16
q -3.154643553710824E-15 8.825869613281225E-15 7.240311208513654E-13 4.965078374618554E-16 1.423408523061038E-13 2.261578917706711E-15
tp -2.394645796430188E-13 7.240311208513654E-13 1.562074127019197E-9 -2.89900339824692E-13 3.681354551007104E-10 -5.803861586659793E-13
node 3.654083668802589E-16 4.965078374618554E-16 -2.89900339824692E-13 4.746964718317142E-10 -4.699503730120946E-10 1.427621733270988E-11
peri -4.749598354337976E-14 1.423408523061038E-13 3.681354551007104E-10 -4.699503730120946E-10 5.576207246603717E-10 -1.423015450012441E-11
i -7.85963974933841E-16 2.261578917706711E-15 -5.803861586659793E-13 1.427621733270988E-11 -1.423015450012441E-11 1.646553434253246E-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. 2020-October); 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.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Franco, L.; Marchini, A.; Saya, L.-F.; Galli, G.; et al. (2020) Minor Planet Bull. 47, 242-246.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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 (A864 SA)          Discovered 1864-Sep-30 by Tempel, E. W. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A864 SA = 1936 QR = 1936 RK = 1974 LF = A909 AA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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