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81 Terpsichore
Classification: Main-belt Asteroid          SPK-ID: 2000081
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2083461019318 4.1841e-08  
a 2.857732574383337 1.0918e-08 au
q 2.262335132147041 1.1795e-07 au
i 7.805404371897915 4.9633e-06 deg
node .9872692097305292 2.5282e-05 deg
peri 51.83239499595302 2.6783e-05 deg
M 101.7235166286629 8.4094e-06 deg
tp 2456901.902990362409
(2014-Sep-01.40299036)
4.021e-05 JED
period 1764.537143606341
4.83
1.0112e-05
2.769e-08
d
yr
n .2040195080644412 1.1692e-09 deg/d
Q 3.453130016619633 1.3192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1357  
   data-arc span      55178 days (151.07 yr)  
   first obs. used      1864-11-19  
   last obs. used      2015-12-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54446  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:30:57  

Additional Information
 Earth MOID = 1.28143 au 
 Jupiter MOID = 2.01057 au 
 T_jup = 3.257 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.48 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 32
diameter diameter 119.08 km 2.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 32
rotation period rot_per 10.943 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[Zeigler, K.W. (1990) Minor Planet Bul. 17, 1-3.]
[Fauerbach, M.; Bennett, T.; Marks, S.A. (2007) Minor Planet Bul. 34, 57-58.]
[Pilcher, F. (2010) Minor Planet Bul. 37, 45-46.]
[Pilcher, F. (2011) Minor Planet Bul. 38, 156-158.]
geometric albedo albedo 0.0505   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 32
B-V BV .701 mag .011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=2.09, mean=9.43, max.=12.17) deg.
U-B UB .346 mag .038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances ]
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