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3726 Johnadams (1981 LJ)
Classification: Main-belt Asteroid          SPK-ID: 2003726
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07746808390748472 2.0887e-08  
a 2.868005924730285 1.1075e-08 au
q 2.645827001106116 6.3808e-08 au
i 3.026153732140157 6.8441e-07 deg
node 105.3561609998961 1.4071e-05 deg
peri 232.4243727387828 1.9167e-05 deg
M 325.9776466563223 1.2284e-05 deg
tp 2459368.160340193603
(2021-Jun-02.66034019)
6.053e-05 TDB
period 1774.06077292749
4.86
1.0276e-05
2.813e-08
d
yr
n .2029242771688938 1.1754e-09 deg/d
Q 3.090184848354454 1.1933e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2814  
   data-arc span      18982 days (51.97 yr)  
   first obs. used      1968-10-22  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43324  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:28:22  

Additional Information
 Earth MOID = 1.63579 au 
 Jupiter MOID = 2.19789 au 
 T_jup = 3.293 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456498.5 (2013-Jul-25.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07584659917557054 2.1345e-08  
q 2.649476433712111 6.546e-08 au
tp 2455834.842536014511
(2011-Sep-30.34253601)
6.4909e-05 TDB
node 105.3636539999951 1.407e-05 deg
peri 234.5711010238394 1.9125e-05 deg
i 3.026094502314562 6.8575e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2814  
   data-arc span      18982 days (51.97 yr)  
   first obs. used      1968-10-22  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43324  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:28:22  

Additional Information
 Jupiter MOID = 2.19789 au 
 T_jup = 3.293 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.555968098416498E-16 -1.381621375810318E-15 4.538385266637372E-13 -5.382374535788447E-14 1.815081050472092E-13 3.003742468838576E-15
q -1.381621375810318E-15 4.284990228299775E-15 -1.534916327415703E-12 1.666701145136762E-13 -5.717592328837392E-13 -9.173689980926391E-15
tp 4.538385266637372E-13 -1.534916327415703E-12 4.213226920924199E-9 5.679450149446497E-11 8.101072416389897E-10 -4.221032783133393E-12
node -5.382374535788447E-14 1.666701145136762E-13 5.679450149446497E-11 1.979641796446664E-10 -1.900157443372006E-10 -7.944777841236867E-12
peri 1.815081050472092E-13 -5.717592328837392E-13 8.101072416389897E-10 -1.900157443372006E-10 3.657513405914657E-10 7.249456416086756E-12
i 3.003742468838576E-15 -9.173689980926391E-15 -4.221032783133393E-12 -7.944777841236867E-12 7.249456416086756E-12 4.702576963965355E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.17   n/a E2021B10  
diameter diameter 10.143 km 0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.509 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.261   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3726 Johnadams (1981 LJ)          Discovered 1981-Jun-04 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 LJ = 1968 UJ = 1971 KF = 1982 RC = 1985 FU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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