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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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 
[ 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 14.3   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

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