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4648 Tirion (1931 UE)
Classification: Main-belt Asteroid          SPK-ID: 2004648
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1855426986076601 5.0643e-08  
a 2.394611836169874 1.2742e-08 au
q 1.950309093969072 1.1728e-07 au
i 9.794793889787405 7.7498e-06 deg
node 319.7127293374523 3.103e-05 deg
peri 123.0009735621281 3.9131e-05 deg
M 225.7547678764277 2.1007e-05 deg
tp 2457905.216477621335
(2017-May-31.71647762)
7.9604e-05 JED
period 1353.477729297888
3.71
1.0803e-05
2.958e-08
d
yr
n .2659814729177322 2.123e-09 deg/d
Q 2.838914578370677 1.5106e-08 au
  Orbit Determination Parameters
   # obs. used (total)      838  
   data-arc span      30561 days (83.67 yr)  
   first obs. used      1931-10-18  
   last obs. used      2015-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49403  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:49:19  

Additional Information
 Earth MOID = .985197 au 
 Jupiter MOID = 2.41456 au 
 T_jup = 3.487 
[ 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 13.2 mag n/a MPO298995  
diameter diameter 12.29 km 0.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
geometric albedo albedo 0.0614   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4

4648 Tirion (1931 UE)          Discovered 1931-Oct-18 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1931 UE = 1977 CA1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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