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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1617998302773609 3.2116e-08  
a 2.680389177719779 1.319e-08 au
q 2.246702663687444 8.6031e-08 au
i 13.03223311159132 6.4303e-06 deg
node 354.5322598117357 1.6455e-05 deg
peri 100.3559431875066 2.8182e-05 deg
M 309.2779347158099 2.0278e-05 deg
tp 2458826.334162019166
(2019-Dec-08.83416202)
9.0196e-05 TDB
period 1602.858595591157
4.39
1.1832e-05
3.239e-08
d
yr
n .2245987269184072 1.6579e-09 deg/d
Q 3.114075691752114 1.5325e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1288  
   data-arc span      14168 days (38.79 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5064  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 01:06:56  

Additional Information
 Earth MOID = 1.30601 au 
 Jupiter MOID = 2.14168 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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