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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1930388231027369 3.3083e-08  
a 2.724223580110464 9.6457e-09 au
q 2.198342666337215 9.2133e-08 au
i 12.10241295693607 4.0376e-06 deg
node 181.2172396367755 1.5617e-05 deg
peri 213.3037361412969 1.8413e-05 deg
M 298.3651347549025 8.8028e-06 deg
tp 2458881.681341451672
(2020-Feb-02.18134145)
4.036e-05 TDB
period 1642.338026051798
4.50
8.7225e-06
2.388e-08
d
yr
n .2191996984113219 1.1642e-09 deg/d
Q 3.250104493883712 1.1508e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1405  
   data-arc span      14180 days (38.82 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54019  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 01:40:38  

Additional Information
 Earth MOID = 1.213 au 
 Jupiter MOID = 2.22562 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

[ 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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