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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08368442356522211 8.5899e-08  
a 3.103270980716306 3.5212e-08 au
q 2.84357553752838 2.6949e-07 au
i 16.07279859148397 9.2597e-06 deg
node 352.4408471837771 2.0205e-05 deg
peri 17.10885666610659 4.1807e-05 deg
M 245.1158749558645 3.7564e-05 deg
tp 2458037.714276652387
(2017-Oct-11.21427665)
0.00021235 JED
period 1996.769697351403
5.47
3.3985e-05
9.305e-08
d
yr
n .1802911975665089 3.0686e-09 deg/d
Q 3.362966423904231 3.8159e-08 au
  Orbit Determination Parameters
   # obs. used (total)      994  
   data-arc span      30462 days (83.40 yr)  
   first obs. used      1932-02-05  
   last obs. used      2015-07-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52936  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:50:04  

Additional Information
 Earth MOID = 1.84274 au 
 Jupiter MOID = 2.08552 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 11.8 mag n/a MPO337413  
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
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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