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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .185902255159598 5.0741e-08  
a 2.394236595313499 1.3034e-08 AU
q 1.949142612859082 1.1769e-07 AU
i 9.794924436862592 8.1808e-06 deg
node 319.7141387779586 3.1372e-05 deg
peri 123.0199395743739 4.1065e-05 deg
M 66.09861196246358 2.2583e-05 deg
tp 2456552.050079210624
(2013-Sep-16.55007921)
8.4945e-05 JED
period 1353.159602428082
3.70
1.105e-05
3.025e-08
d
yr
n .2660440049747445 2.1725e-09 deg/d
Q 2.839330577767916 1.5457e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      828  
   data-arc span      30193 days (82.66 yr)  
   first obs. used      1931-10-18  
   last obs. used      2014-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49633  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:09:53  

Additional Information
 Earth MOID = .98385 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 13.1 mag n/a MPO250251  
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 (024)
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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