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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2106974031124606 3.6254e-08  
a 2.853597191430496 8.1005e-09 au
q 2.252351673667079 1.0292e-07 au
i 7.802983016645118 4.4336e-06 deg
node .9596455000487254 2.2619e-05 deg
peri 51.67737716557171 2.4343e-05 deg
M 347.1899450992025 9.4276e-06 deg
tp 2458663.152141550670
(2019-Jun-28.65214155)
4.6262e-05 TDB
period 1760.708375796029
4.82
7.4972e-06
2.053e-08
d
yr
n .2044631609350079 8.7062e-10 deg/d
Q 3.454842709193912 9.8073e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3210  
   data-arc span      56627 days (155.04 yr)  
   first obs. used      1864-11-19  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37978  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:36:24  

Additional Information
 Earth MOID = 1.27209 au 
 Jupiter MOID = 2.00521 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 8.48   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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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