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30756 (1981 ET39)
Classification: Main-belt Asteroid          SPK-ID: 2030756
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1621296929051486 3.2306e-08  
a 3.177683485243306 1.9238e-08 au
q 2.662486637631047 1.0017e-07 au
i 4.242256001803139 4.6842e-06 deg
node 334.2022403359136 5.3724e-05 deg
peri 115.9329101970553 5.5965e-05 deg
M 103.8808163330982 1.553e-05 deg
tp 2458799.468514138462
(2019-Nov-11.96851414)
8.787e-05 TDB
period 2069.018539678851
5.66
1.8789e-05
5.144e-08
d
yr
n .1739955409272836 1.5801e-09 deg/d
Q 3.692880332855566 2.2358e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1125  
   data-arc span      14703 days (40.25 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-05-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47333  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 19:49:59  

Additional Information
 Earth MOID = 1.68258 au 
 Jupiter MOID = 1.52334 au 
 T_jup = 3.176 
[ 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 14.45   n/a E2021B10  
diameter diameter 8.210 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30756 (1981 ET39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 ET39 = 1998 FL144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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