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18331 (1987 DQ6)
Classification: Main-belt Asteroid          SPK-ID: 2018331
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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08298514521505149 9.3575e-08  
a 3.105219274085633 3.9967e-08 AU
q 2.84753220170106 2.8771e-07 AU
i 16.06741617105739 9.548e-06 deg
node 352.4444456161057 2.1305e-05 deg
peri 17.45771034852769 4.7605e-05 deg
M 136.5689403310195 4.019e-05 deg
tp 2456042.295643481918
(2012-Apr-24.79564348)
0.00022247 JED
period 1998.650408247419
5.47
3.8587e-05
1.056e-07
d
yr
n .1801215452759833 3.4775e-09 deg/d
Q 3.362906346470206 4.3284e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      897  
   data-arc span      30061 days (82.30 yr)  
   first obs. used      1932-02-05  
   last obs. used      2014-05-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54846  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 14:03:08  

Additional Information
 Earth MOID = 1.84736 AU 
 T_jup = 3.155 
[ 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 11.7 mag n/a MPO256998  
diameter diameter 25.28 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
geometric albedo albedo 0.0365   0.005 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4

18331 (1987 DQ6)          Discovered 1987-Feb-24 by Debehogne, H. at La Silla (809)
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1987 DQ6 = 1932 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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