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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08343114804239965 9.3737e-08  
a 3.103686650471544 3.9348e-08 AU
q 2.844742510058833 2.8807e-07 AU
i 16.07241031778085 9.5508e-06 deg
node 352.4420445484 2.1299e-05 deg
peri 17.25453574552777 4.7362e-05 deg
M 172.8238586748798 4.0003e-05 deg
tp 2456041.725607873137
(2012-Apr-24.22560787)
0.00022073 JED
period 1997.170898810859
5.47
3.7979e-05
1.04e-07
d
yr
n .1802549797888346 3.4278e-09 deg/d
Q 3.362630790884255 4.2631e-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 = 1.84594 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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