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27685 (1981 EE21)
Classification: Main-belt Asteroid          SPK-ID: 2027685
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1932500440198466 3.2777e-08  
a 2.724625834930465 9.4907e-09 au
q 2.198091772392542 9.135e-08 au
i 12.10196955175742 4.0089e-06 deg
node 181.2130960674948 1.5421e-05 deg
peri 213.3402785601747 1.8247e-05 deg
M 26.02073789479955 8.7811e-06 deg
tp 2458881.765797482315
(2020-Feb-02.26579748)
3.9977e-05 TDB
period 1642.701797281055
4.50
8.5831e-06
2.35e-08
d
yr
n .219151157316477 1.1451e-09 deg/d
Q 3.251159897468389 1.1325e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      14525 days (39.77 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54171  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:53:33  

Additional Information
 Earth MOID = 1.21346 au 
 Jupiter MOID = 2.2273 au 
 T_jup = 3.298 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456847.5 (2014-Jul-09.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1933204338656854 3.2973e-08  
q 2.198159316914856 9.1969e-08 au
tp 2457232.101689291576
(2015-Jul-28.60168929)
3.9401e-05 TDB
node 181.3509082493989 1.5362e-05 deg
peri 212.0591082565867 1.8219e-05 deg
i 12.12323935297633 4.0164e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      14525 days (39.77 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54171  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:53:33  

Additional Information
 Jupiter MOID = 2.2273 au 
 T_jup = 3.298 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.087202503721098E-15 -3.02264649222334E-15 -2.425319315008354E-13 -1.100288003667471E-15 -6.734331141348477E-14 -3.24044726119474E-15
q -3.02264649222334E-15 8.458244068447967E-15 6.59119468914658E-13 2.589631459029835E-15 1.805990144562578E-13 9.316723562082067E-15
tp -2.425319315008354E-13 6.59119468914658E-13 1.552464865907206E-9 -2.824202294515751E-12 3.947510871166971E-10 -2.805116922538241E-12
node -1.100288003667471E-15 2.589631459029835E-15 -2.824202294515751E-12 2.359773686551343E-10 -2.310036618942758E-10 5.970970132261119E-12
peri -6.734331141348477E-14 1.805990144562578E-13 3.947510871166971E-10 -2.310036618942758E-10 3.319365938572237E-10 -6.573318651289846E-12
i -3.24044726119474E-15 9.316723562082067E-15 -2.805116922538241E-12 5.970970132261119E-12 -6.573318651289846E-12 1.613156456063347E-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 14.3   n/a MPO358888  
diameter diameter 4.046 km 0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.247   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27685 (1981 EE21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EE21 = 2000 LY32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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