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30761 (1981 EF42)
Classification: Main-belt Asteroid          SPK-ID: 2030761
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1507003672119892 4.0533e-08  
a 2.755902924896847 1.6499e-08 au
q 2.340587342114297 1.1028e-07 au
i 1.675821615966141 4.4017e-06 deg
node 41.50064945973432 0.00014074 deg
peri 210.8419830290599 0.0001415 deg
M 188.5510723649536 1.5971e-05 deg
tp 2459996.341482810960
(2023-Feb-20.84148281)
7.6777e-05 TDB
period 1671.068683624596
4.58
1.5006e-05
4.108e-08
d
yr
n .2154310014470199 1.9346e-09 deg/d
Q 3.171218507679396 1.8985e-08 au
  Orbit Determination Parameters
   # obs. used (total)      769  
   data-arc span      15921 days (43.59 yr)  
   first obs. used      1977-06-12  
   last obs. used      2021-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53881  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:39:46  

Additional Information
 Earth MOID = 1.32479 au 
 Jupiter MOID = 1.86905 au 
 T_jup = 3.326 
[ 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 15.24   n/a MPCxxxxx  
diameter diameter 4.112 km 0.515 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.079   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30761 (1981 EF42)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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