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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1329856893381237 6.3595e-08  
a 2.545331382979564 1.1134e-08 au
q 2.206838734420066 1.626e-07 au
i 21.81876865307915 1.077e-05 deg
node 336.605420101943 9.9491e-06 deg
peri 97.90438624393148 5.7646e-05 deg
M 234.4686006064528 5.3309e-05 deg
tp 2459117.707477092600
(2020-Sep-25.20747709)
0.00022016 TDB
period 1483.251940573102
4.06
9.7325e-06
2.665e-08
d
yr
n .242709947078109 1.5926e-09 deg/d
Q 2.88382403153906 1.2615e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1037  
   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      .52847  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 06:56:53  

Additional Information
 Earth MOID = 1.3333 au 
 Jupiter MOID = 2.41852 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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