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19108 (1981 EV21)
Classification: Main-belt Asteroid          SPK-ID: 2019108
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1102401472235951 4.1337e-08  
a 3.009758819550579 2.4172e-08 au
q 2.67796256417581 1.2669e-07 au
i 10.58071853704803 6.454e-06 deg
node 354.8505820887513 2.6082e-05 deg
peri 82.12245425273423 4.2555e-05 deg
M 270.4313575078253 3.0808e-05 deg
tp 2459475.014471433544
(2021-Sep-17.51447143)
0.00016308 TDB
period 1907.198824979404
5.22
2.2976e-05
6.29e-08
d
yr
n .1887585055553334 2.274e-09 deg/d
Q 3.341555074925348 2.6837e-08 au
  Orbit Determination Parameters
   # obs. used (total)      811  
   data-arc span      13628 days (37.31 yr)  
   first obs. used      1981-02-09  
   last obs. used      2018-06-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53981  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 22:53:38  

Additional Information
 Earth MOID = 1.71868 au 
 Jupiter MOID = 1.94727 au 
 T_jup = 3.215 
[ 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 14.5   n/a MPO350954  
diameter diameter 4.017 km 0.527 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.389 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.209   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

19108 (1981 EV21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EV21 = 1999 RB186 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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