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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1620761375116233 3.4251e-08  
a 3.17848054946591 2.0819e-08 au
q 2.663324698852653 1.0897e-07 au
i 4.242169369600608 5.055e-06 deg
node 334.2013138792245 5.5854e-05 deg
peri 116.0226117581384 5.8271e-05 deg
M 69.69733886136677 1.5633e-05 deg
tp 2458799.779593013409
(2019-Nov-12.27959301)
8.9236e-05 TDB
period 2069.797052110061
5.67
2.0336e-05
5.568e-08
d
yr
n .173930096012552 1.7088e-09 deg/d
Q 3.693636400079166 2.4193e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1028  
   data-arc span      14648 days (40.10 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4801  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:31:24  

Additional Information
 Earth MOID = 1.68308 au 
 Jupiter MOID = 1.52181 au 
 T_jup = 3.175 
[ 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

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