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65639 (1981 DS2)
Classification: Main-belt Asteroid          SPK-ID: 2065639
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07868061518067358 5.8603e-08  
a 2.586030798532535 1.6953e-08 au
q 2.382560304427827 1.5055e-07 au
i 10.36689258091559 5.7809e-06 deg
node 290.5434926818388 3.106e-05 deg
peri 28.15859319659464 4.8234e-05 deg
M 289.5173476251606 4.1085e-05 deg
tp 2458897.891604663584
(2020-Feb-18.39160466)
0.00017512 TDB
period 1518.969194143274
4.16
1.4937e-05
4.09e-08
d
yr
n .2370028315176243 2.3306e-09 deg/d
Q 2.789501292637244 1.8287e-08 au
  Orbit Determination Parameters
   # obs. used (total)      997  
   data-arc span      13985 days (38.29 yr)  
   first obs. used      1981-02-04  
   last obs. used      2019-05-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51414  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 04:49:12  

Additional Information
 Earth MOID = 1.37247 au 
 Jupiter MOID = 2.43809 au 
 T_jup = 3.395 
[ 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 14.1   n/a MPO259753  
diameter diameter 4.543 km 0.291 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.236   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

65639 (1981 DS2)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 DS2 = 1999 RY196 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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