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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1935187578114008 2.9062e-08  
a 2.724980889618136 8.5804e-09 au
q 2.197645972799428 7.9778e-08 au
i 12.10345569990357 3.6013e-06 deg
node 181.2019850087451 1.441e-05 deg
peri 213.3575233615988 1.7328e-05 deg
M 112.7591705700935 8.8471e-06 deg
tp 2458881.872499601642
(2020-Feb-02.37249960)
3.988e-05 TDB
period 1643.02290631203
4.50
7.7603e-06
2.125e-08
d
yr
n .2191083268632359 1.0349e-09 deg/d
Q 3.252315806436843 1.0241e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1727  
   data-arc span      14698 days (40.24 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-05-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 19:28:36  

Additional Information
 Earth MOID = 1.21233 au 
 Jupiter MOID = 2.22837 au 
 T_jup = 3.298 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.33   n/a MPCxxxxx  
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

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