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30764 (1981 EK47)
Classification: Outer Main-belt Asteroid          SPK-ID: 2030764
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1308806048773619 4.5815e-08  
a 3.971111671532662 3.2843e-08 au
q 3.451370173926916 1.8225e-07 au
i 1.961364054154662 3.9481e-06 deg
node 236.4557601233543 0.00015268 deg
peri 289.4187442027961 0.0001535 deg
M 17.5748897816733 1.5258e-05 deg
tp 2459059.390359242413
(2020-Jul-28.89035924)
0.00012242 TDB
period 2890.457425554026
7.91
3.5858e-05
9.817e-08
d
yr
n .124547760785993 1.5451e-09 deg/d
Q 4.490853169138409 3.7141e-08 au
  Orbit Determination Parameters
   # obs. used (total)      830  
   data-arc span      14648 days (40.10 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54468  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:31:27  

Additional Information
 Earth MOID = 2.45904 au 
 Jupiter MOID = .541176 au 
 T_jup = 3.041 
[ 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 13.67   n/a E2021B10  
diameter diameter 12.394 km 0.502 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
geometric albedo albedo 0.035   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

30764 (1981 EK47)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EK47 = 1997 HH18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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