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27684 (1981 EX20)
Classification: Main-belt Asteroid          SPK-ID: 2027684
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09264706768740751 4.2482e-08  
a 2.798349697206431 1.441e-08 au
q 2.539090803396311 1.2058e-07 au
i 7.726540131420651 4.7359e-06 deg
node 165.2020263252307 3.5618e-05 deg
peri 91.90589417962418 4.5309e-05 deg
M 61.99077704424644 2.6372e-05 deg
tp 2458706.074118242963
(2019-Aug-10.57411824)
0.00012551 TDB
period 1709.823984895036
4.68
1.3207e-05
3.616e-08
d
yr
n .2105479880855105 1.6263e-09 deg/d
Q 3.057608591016552 1.5745e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1092  
   data-arc span      14424 days (39.49 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54173  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 02:30:13  

Additional Information
 Earth MOID = 1.53922 au 
 Jupiter MOID = 2.01346 au 
 T_jup = 3.307 
[ 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 14.6   n/a MPO347729  
diameter diameter 3.533 km 0.239 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.205   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27684 (1981 EX20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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