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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0590000160122218 5.4339e-08  
a 5.271507167423276 8.904e-08 au
q 4.960488160136761 2.9272e-07 au
i 20.36643176598422 5.3113e-06 deg
node 147.5156168850916 1.3766e-05 deg
peri 218.2967466058399 4.7946e-05 deg
M 213.7303332558981 5.001e-05 deg
tp 2460796.690520440765
(2025-May-01.19052044)
0.00064118 TDB
period 4420.797570353046
12.10
0.00011201
3.067e-07
d
yr
n .08143326951096977 2.0632e-09 deg/d
Q 5.58252617470979 9.4293e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2185  
   data-arc span      11988 days (32.82 yr)  
   first obs. used      1987-08-21  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45114  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:44:29  

Additional Information
 Earth MOID = 3.97603 au 
 Jupiter MOID = .0040743 au 
 T_jup = 2.871 
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Orbital Elements at Epoch 2457111.5 (2015-Mar-30.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05900387586361599 5.4485e-08  
q 4.968315468737842 2.9347e-07 au
tp 2456395.277270728280
(2013-Apr-12.77727073)
0.00057708 TDB
node 147.5050588041934 1.377e-05 deg
peri 219.9862536715191 4.7736e-05 deg
i 20.35620608852507 5.3084e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2185  
   data-arc span      11988 days (32.82 yr)  
   first obs. used      1987-08-21  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45114  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:44:29  

Additional Information
 Jupiter MOID = .0040743 au 
 T_jup = 2.871 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.968665309700158E-15 -1.530778461376188E-14 4.826664386801885E-12 -5.966035823512631E-15 3.094576145897258E-13 9.009062306783772E-16
q -1.530778461376188E-14 8.612317553429884E-14 -1.630967849651178E-12 3.735625752659824E-14 3.438698893264911E-13 3.114954214424232E-16
tp 4.826664386801885E-12 -1.630967849651178E-12 3.330215831204961E-7 -1.612890908028978E-11 2.642682533956346E-8 4.987143029297503E-12
node -5.966035823512631E-15 3.735625752659824E-14 -1.612890908028978E-11 1.896027618951187E-10 -1.785316768687853E-10 1.797128725183308E-11
peri 3.094576145897258E-13 3.438698893264911E-13 2.642682533956346E-8 -1.785316768687853E-10 2.278716198994345E-9 -1.64119112311536E-11
i 9.009062306783772E-16 3.114954214424232E-16 4.987143029297503E-12 1.797128725183308E-11 -1.64119112311536E-11 2.817885828239304E-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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