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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 ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2791700491283595 3.6548e-08  
a 3.162136123408642 2.1576e-08 au
q 2.279362426486091 1.1243e-07 au
i 12.9419910899184 4.9534e-06 deg
node 193.9560127977578 1.8543e-05 deg
peri 274.8286291292537 2.0435e-05 deg
M 100.4365518662408 7.726e-06 deg
tp 2458823.494800715079
(2019-Dec-05.99480072)
4.3211e-05 TDB
period 2053.852585633297
5.62
2.1021e-05
5.755e-08
d
yr
n .1752803499716585 1.794e-09 deg/d
Q 4.044909820331193 2.76e-08 au
  Orbit Determination Parameters
   # obs. used (total)      617  
   data-arc span      14754 days (40.39 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-07-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55362  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 17:28:42  

Additional Information
 Earth MOID = 1.33919 au 
 Jupiter MOID = 1.48515 au 
 T_jup = 3.105 
[ 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 15.29   n/a MPO636868  
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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