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JPL Small-Body Database Browser
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65640 (1981 DY2)
Classification: Main-belt Asteroid          SPK-ID: 2065640
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1332544543027238 6.3588e-08  
a 2.545010301921765 1.0941e-08 au
q 2.20587634294437 1.6245e-07 au
i 21.82157344294423 1.0762e-05 deg
node 336.6006136055852 9.9215e-06 deg
peri 97.97264416902173 5.7387e-05 deg
M 331.5281986866755 5.3148e-05 deg
tp 2459117.785733275415
(2020-Sep-25.28573328)
0.00021906 TDB
period 1482.971291998638
4.06
9.5627e-06
2.618e-08
d
yr
n .242755879323071 1.5654e-09 deg/d
Q 2.88414426089916 1.2399e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1040  
   data-arc span      14179 days (38.82 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52179  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 14:43:17  

Additional Information
 Earth MOID = 1.33214 au 
 Jupiter MOID = 2.41691 au 
 T_jup = 3.331 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.7   n/a MPO453051  

65640 (1981 DY2)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 DY2 = 1999 RW30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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