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58138 (1981 ET45)
Classification: Main-belt Asteroid          SPK-ID: 2058138
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2793942947358488 4.0975e-08  
a 3.163952498558483 2.7299e-08 au
q 2.279962221646009 1.319e-07 au
i 12.93968751405839 7.2443e-06 deg
node 193.9646443675074 2.2072e-05 deg
peri 274.9506845843924 2.5455e-05 deg
M 320.8739633331917 1.1605e-05 deg
tp 2458823.912112804545
(2019-Dec-06.41211280)
6.6912e-05 TDB
period 2055.622482147951
5.63
2.6604e-05
7.284e-08
d
yr
n .1751294331164498 2.2665e-09 deg/d
Q 4.047942775470958 3.4926e-08 au
  Orbit Determination Parameters
   # obs. used (total)      432  
   data-arc span      14180 days (38.82 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61449  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 05:58:43  

Additional Information
 Earth MOID = 1.33964 au 
 Jupiter MOID = 1.48359 au 
 T_jup = 3.104 
[ 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 15.2   n/a MPO324822  
diameter diameter 4.999 km 1.850 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.071   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

58138 (1981 ET45)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20030614/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 ET45 = 1998 FK144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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