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9538 (1982 UM2)
Classification: Main-belt Asteroid          SPK-ID: 2009538
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1389089849374013 2.2063e-07  
a 2.521654566942982 1.1289e-08 AU
q 2.17137409068617 5.5597e-07 AU
i 2.268691792980732 6.8906e-06 deg
node 158.8312651792122 0.00017693 deg
peri 250.5395132168746 0.00018921 deg
M 359.1687892591491 5.5467e-05 deg
tp 2457003.877034234149
(2014-Dec-12.37703423)
0.00022535 JED
period 1462.60420437928
4.00
9.8217e-06
2.689e-08
d
yr
n .2461363087307559 1.6529e-09 deg/d
Q 2.871935043199794 1.2857e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1398  
   data-arc span      22012 days (60.27 yr)  
   first obs. used      1954-12-21  
   last obs. used      2015-03-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51318  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:35:22  

Additional Information
 Earth MOID = 1.18247 AU 
 T_jup = 3.441 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7 mag n/a MPO299031  
rotation period rot_per 21.9952 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J., in press.]

9538 (1982 UM2)          Discovered 1982-Oct-20 by Mrkos, A. at Klet
Reference: 19981110/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1982 UM2 = 1986 VH 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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