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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1103502021680378 3.6578e-08  
a 3.009024984857246 1.8428e-08 au
q 2.676978469449572 1.1874e-07 au
i 10.582172648 6.346e-06 deg
node 354.849780995421 1.8737e-05 deg
peri 82.26933041734473 3.7846e-05 deg
M 308.0623513793659 3.0693e-05 deg
tp 2459475.553325895173
(2021-Sep-18.05332590)
0.00016256 TDB
period 1906.501352140981
5.22
1.7514e-05
4.795e-08
d
yr
n .1888275608069849 1.7346e-09 deg/d
Q 3.34107150026492 2.0461e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1071  
   data-arc span      14612 days (40.01 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51105  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:46:00  

Additional Information
 Earth MOID = 1.7173 au 
 Jupiter MOID = 1.94668 au 
 T_jup = 3.215 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457384.5 (2015-Dec-28.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1091820623073467 3.5809e-08  
q 2.682493429497077 1.1595e-07 au
tp 2457552.292823885039
(2016-Jun-12.79282389)
0.00016657 TDB
node 355.2433590842053 1.8682e-05 deg
peri 79.40718901985159 3.8519e-05 deg
i 10.60100234352 6.3514e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1071  
   data-arc span      14612 days (40.01 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51105  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:46:00  

Additional Information
 Jupiter MOID = 1.94668 au 
 T_jup = 3.215 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.282263425256938E-15 -4.119692571557303E-15 -4.630695232400781E-14 1.568289123056711E-15 4.817475621199165E-14 6.67010615550169E-16
q -4.119692571557303E-15 1.34449766449945E-14 1.230088222547637E-13 -7.739804386250935E-15 -1.625012757931352E-13 -8.33833158874247E-16
tp -4.630695232400781E-14 1.230088222547637E-13 2.774498278633796E-8 -2.801859827433286E-11 5.613565163144626E-9 3.371876798524955E-12
node 1.568289123056711E-15 -7.739804386250935E-15 -2.801859827433286E-11 3.489989487420875E-10 -3.479014192343525E-10 -7.417457205884494E-12
peri 4.817475621199165E-14 -1.625012757931352E-13 5.613565163144626E-9 -3.479014192343525E-10 1.483682677302704E-9 7.656532409583323E-12
i 6.67010615550169E-16 -8.33833158874247E-16 3.371876798524955E-12 -7.417457205884494E-12 7.656532409583323E-12 4.033979629202086E-11

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 14.52   n/a E2021B10  
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. 2020-October); 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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