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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08343114853206413 9.3733e-08  
a 3.103686649945597 3.9257e-08 AU
q 2.844742508057001 2.8802e-07 AU
i 16.07241061115054 9.5464e-06 deg
node 352.4420458393936 2.1261e-05 deg
peri 17.25453493272477 4.7285e-05 deg
M 172.8238584434759 3.9978e-05 deg
tp 2456041.725609400606
(2012-Apr-24.22560940)
0.00022054 JED
period 1997.170898303201
5.47
3.7891e-05
1.037e-07
d
yr
n .1802549798346534 3.4199e-09 deg/d
Q 3.362630791834192 4.2532e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      901  
   data-arc span      30075 days (82.34 yr)  
   first obs. used      1932-02-05  
   last obs. used      2014-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54887  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 14:09:49  

Additional Information
 Earth MOID = 1.84594 AU 
 T_jup = 3.156 
[ 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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