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27686 (1981 ES21)
Classification: Main-belt Asteroid          SPK-ID: 2027686
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1618105350298401 3.2022e-08  
a 2.680496904072156 1.2408e-08 au
q 2.24676426587841 8.5957e-08 au
i 13.03232522648857 4.9957e-06 deg
node 354.5217054992531 1.6166e-05 deg
peri 100.28217216 2.6358e-05 deg
M 39.17515229046545 1.7079e-05 deg
tp 2458826.066624713700
(2019-Dec-08.56662471)
7.639e-05 TDB
period 1602.955226248132
4.39
1.113e-05
3.047e-08
d
yr
n .2245851874743962 1.5594e-09 deg/d
Q 3.114229542265901 1.4416e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1476  
   data-arc span      14239 days (38.98 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4772  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:08:40  

Additional Information
 Earth MOID = 1.30597 au 
 Jupiter MOID = 2.14066 au 
 T_jup = 3.321 
[ 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 14.0   n/a MPO384984  

27686 (1981 ES21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 ES21 = 1992 SP25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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