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3781 Dufek (1986 RG1)
Classification: Main-belt Asteroid          SPK-ID: 2003781
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07281892460686312 1.3902e-08  
a 2.843588327083933 9.58e-09 au
q 2.636521283081052 3.8594e-08 au
i 2.046200960183418 1.0359e-06 deg
node 183.5626528245289 9.3416e-06 deg
peri 156.9561491364904 1.8569e-05 deg
M 53.84041061397517 1.5343e-05 deg
tp 2458938.558461704076
(2020-Mar-30.05846170)
7.4814e-05 TDB
period 1751.453094639957
4.80
8.851e-06
2.423e-08
d
yr
n .2055436146715677 1.0387e-09 deg/d
Q 3.050655371086814 1.0278e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3176  
   data-arc span      31047 days (85.00 yr)  
   first obs. used      1936-03-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4701  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:12:12  

Additional Information
 Earth MOID = 1.6261 au 
 Jupiter MOID = 2.23319 au 
 T_jup = 3.303 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.47   n/a MPCxxxxx  
diameter diameter 8.267 km 0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.158   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3781 Dufek (1986 RG1)          Discovered 1986-Sep-02 by Mrkos, A. at Klet
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1986 RG1 = 1936 FZ = 1948 TK1 = 1972 TS1 = 1981 OA = 1982 VE1 = 1984 CO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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