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7815 Dolon (1987 QN)
Classification: Jupiter Trojan          SPK-ID: 2007815
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05844868230309026 6.7487e-08  
a 5.273747268451037 9.9194e-08 au
q 4.965503689810552 3.4072e-07 au
i 20.36390874588013 6.3789e-06 deg
node 147.505675708248 1.3969e-05 deg
peri 218.5640295513583 4.9421e-05 deg
M 180.8601608203648 5.042e-05 deg
tp 2460801.738379296404
(2025-May-06.23837930)
0.00065127 TDB
period 4423.615763951135
12.11
0.00012481
3.417e-07
d
yr
n .08138139006866435 2.2961e-09 deg/d
Q 5.581990847091522 1.0499e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1843  
   data-arc span      11587 days (31.72 yr)  
   first obs. used      1987-08-21  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4723  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:31:03  

Additional Information
 Earth MOID = 3.9804 au 
 Jupiter MOID = .000253403 au 
 T_jup = 2.871 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456746.5 (2014-Mar-30.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05946319328660599 6.7396e-08  
q 4.967615975251549 3.4051e-07 au
tp 2456395.456499504758
(2013-Apr-12.95649950)
0.00058323 TDB
node 147.5027090908389 1.397e-05 deg
peri 219.9880634157498 4.8666e-05 deg
i 20.35617940433655 6.3764e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1843  
   data-arc span      11587 days (31.72 yr)  
   first obs. used      1987-08-21  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4723  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:31:03  

Additional Information
 Jupiter MOID = .000253403 au 
 T_jup = 2.871 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.542211463406504E-15 -2.212148354864041E-14 1.530430150987493E-12 -5.880038579223463E-15 -5.586504059746462E-14 -3.55585255264837E-15
q -2.212148354864041E-14 1.159480480928272E-13 1.280788183592842E-11 3.641714352372916E-14 1.947808460381803E-12 2.110539689820067E-14
tp 1.530430150987493E-12 1.280788183592842E-11 3.401599461557494E-7 4.442669299000684E-12 2.719948743890247E-8 -2.832731517933391E-11
node -5.880038579223463E-15 3.641714352372916E-14 4.442669299000684E-12 1.951572837517935E-10 -1.820097554633289E-10 1.187964820952433E-11
peri -5.586504059746462E-14 1.947808460381803E-12 2.719948743890247E-8 -1.820097554633289E-10 2.36835738902349E-9 -1.323925312600164E-11
i -3.55585255264837E-15 2.110539689820067E-14 -2.832731517933391E-11 1.187964820952433E-11 -1.323925312600164E-11 4.065831821884295E-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 10.2   n/a MPO350865  
diameter diameter 42.516 km 0.955 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.089   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

7815 Dolon (1987 QN)          Discovered 1987-Aug-21 by Elst, E. W. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 QN = 1993 BO7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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