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18331 (1987 DQ6)
Classification: Main-belt Asteroid          SPK-ID: 2018331
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08450102404682398 5.2656e-08  
a 3.103178404334842 1.8285e-08 au
q 2.840956651368558 1.6311e-07 au
i 16.0745579188935 5.5688e-06 deg
node 352.4170455807532 1.2615e-05 deg
peri 16.42903578867176 2.5614e-05 deg
M 174.1078216638932 2.3461e-05 deg
tp 2458034.839817314153
(2017-Oct-08.33981731)
0.00012712 TDB
period 1996.680346951918
5.47
1.7648e-05
4.832e-08
d
yr
n .1802992655031472 1.5936e-09 deg/d
Q 3.365400157301125 1.983e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2192  
   data-arc span      32274 days (88.36 yr)  
   first obs. used      1932-02-05  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41722  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:21:03  

Additional Information
 Earth MOID = 1.84161 au 
 Jupiter MOID = 2.09169 au 
 T_jup = 3.156 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457267.5 (2015-Sep-02.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08367661889516305 5.2556e-08  
q 2.843461916573509 1.6262e-07 au
tp 2458037.959102987693
(2017-Oct-11.45910299)
0.00012862 TDB
node 352.4431430184695 1.2616e-05 deg
peri 17.15400121998568 2.5885e-05 deg
i 16.07311524168469 5.5683e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2192  
   data-arc span      32274 days (88.36 yr)  
   first obs. used      1932-02-05  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41722  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:21:03  

Additional Information
 Jupiter MOID = 2.09169 au 
 T_jup = 3.156 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.762158203250223E-15 -8.502073528673072E-15 -6.727360914956763E-13 6.466671128520936E-15 -2.128527980271731E-13 -2.071565304255148E-15
q -8.502073528673072E-15 2.644561418097779E-14 2.760278505694474E-12 -1.807577092223928E-14 7.529554476071492E-13 7.356687438779329E-15
tp -6.727360914956763E-13 2.760278505694474E-12 1.654277689242509E-8 -5.105556994968078E-12 2.904342167984648E-9 -4.997362055795703E-12
node 6.466671128520936E-15 -1.807577092223928E-14 -5.105556994968078E-12 1.59172205698285E-10 -1.535445770185815E-10 4.021954009008948E-12
peri -2.128527980271731E-13 7.529554476071492E-13 2.904342167984648E-9 -1.535445770185815E-10 6.700487655363752E-10 -4.644325578570501E-12
i -2.071565304255148E-15 7.356687438779329E-15 -4.997362055795703E-12 4.021954009008948E-12 -4.644325578570501E-12 3.100590501278271E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.9   n/a MPO452430  
diameter diameter 27.533 km 0.324 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.028   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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