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JPL Small-Body Database Browser
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115 Thyra
Classification: Main-belt Asteroid          SPK-ID: 2000115
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 75 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1931026282462318 3.0487e-08  
a 2.37958246861135 3.3877e-09 au
q 1.920078839793842 7.2442e-08 au
i 11.59296375188064 3.8246e-06 deg
node 308.7956628640295 1.7013e-05 deg
peri 97.14189576679603 2.0285e-05 deg
M 16.74345779223764 1.1016e-05 deg
tp 2458538.141994102922
(2019-Feb-23.64199410)
4.097e-05 TDB
period 1340.755440214716
3.67
2.8632e-06
7.839e-09
d
yr
n .2685053434818415 5.7339e-10 deg/d
Q 2.839086097428858 4.0419e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2187  
   data-arc span      53671 days (146.94 yr)  
   first obs. used      1872-12-25  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52984  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:37:03  

Additional Information
 Earth MOID = .969638 au 
 Jupiter MOID = 2.62842 au 
 T_jup = 3.487 
[ 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 7.6   n/a MPO502153 IRAS observations used: 17
magnitude slope G 0.12   n/a PDS3 (MPC 17257) Fit
diameter diameter 79.83 km 1.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 7.241 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Scaltriti, F.; Zappala, V.; Harris, A.W. (1981) Icarus 46, 275-280.]
[Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.]
[Michalowski, T.; Kwiatkowski, T.; Pych, W.; Kryszczynska, A.; et al. (2004) Astron. Astrophys. 416, 353-366.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.2747   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV 0.851   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=11.98, mean=19.65, max.=30.11) deg.
U-B UB 0.431   0.048 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=11.98, mean=19.65, max.=30.11) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   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)

115 Thyra          Discovered 1871-Aug-06 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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