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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 ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 63 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2111519090109495 2.5123e-08  
a 2.852635928476841 6.5873e-09 au
q 2.250296406465734 6.8649e-08 au
i 7.804875974629673 1.1667e-06 deg
node .9473068744620901 2.2071e-06 deg
peri 51.54705993257956 3.823e-06 deg
M 150.0643917013137 3.5249e-06 deg
tp 2458662.927402623956
(2019-Jun-28.42740262)
1.5501e-05 TDB
period 1759.818782199908
4.82
6.0956e-06
1.669e-08
d
yr
n .2045665176672183 7.0857e-10 deg/d
Q 3.454975450487949 7.9782e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4128  
   data-arc span      57197 days (156.60 yr)  
   first obs. used      1864-11-19  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35184  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:30:43  

Additional Information
 Earth MOID = 1.26995 au 
 Jupiter MOID = 2.00869 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 8.66   n/a MPO614063 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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