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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1858264057735334 5.0679e-08  
a 2.394057076584865 1.2916e-08 AU
q 1.949178054826407 1.1741e-07 AU
i 9.794909491468232 8.0472e-06 deg
node 319.7136926115181 3.1341e-05 deg
peri 122.9955872797772 4.0558e-05 deg
M 119.3461117095865 2.2099e-05 deg
tp 2456551.955071502442
(2013-Sep-16.45507150)
8.3027e-05 JED
period 1353.007416379452
3.70
1.0949e-05
2.998e-08
d
yr
n .266073929560071 2.1532e-09 deg/d
Q 2.838936098343323 1.5316e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      835  
   data-arc span      30430 days (83.31 yr)  
   first obs. used      1931-10-18  
   last obs. used      2015-02-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49468  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:54:35  

Additional Information
 Earth MOID = .984245 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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