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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1932500432439224 3.2983e-08  
a 2.724625835823938 9.544e-09 au
q 2.198091775227454 9.1989e-08 au
i 12.10196948336575 4.0339e-06 deg
node 181.2130959202355 1.5444e-05 deg
peri 213.3402792583004 1.8268e-05 deg
M 26.02073699703578 8.7882e-06 deg
tp 2458881.765801520462
(2020-Feb-02.26580152)
4.0008e-05 TDB
period 1642.70179808908
4.50
8.6313e-06
2.363e-08
d
yr
n .2191511572086793 1.1515e-09 deg/d
Q 3.251159896420422 1.1388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1453  
   data-arc span      14237 days (38.98 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54189  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:08:40  

Additional Information
 Earth MOID = 1.21346 au 
 Jupiter MOID = 2.2273 au 
 T_jup = 3.298 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456817.5 (2014-Jun-09.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1933310099115701 3.3172e-08  
q 2.198134537279393 9.259e-08 au
tp 2457232.095227060801
(2015-Jul-28.59522706)
3.942e-05 TDB
node 181.3518924041663 1.5384e-05 deg
peri 212.057757779891 1.824e-05 deg
i 12.12319248972796 4.0415e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1453  
   data-arc span      14237 days (38.98 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54189  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:08:40  

Additional Information
 Jupiter MOID = 2.2273 au 
 T_jup = 3.298 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.100413038909695E-15 -3.061552814409059E-15 -2.411038801953391E-13 -1.188283333514607E-15 -6.619134343408333E-14 -3.373002116410315E-15
q -3.061552814409059E-15 8.572836633994857E-15 6.552931193753926E-13 2.85181468279073E-15 1.772962365700773E-13 9.700527325510748E-15
tp -2.411038801953391E-13 6.552931193753926E-13 1.553923609126825E-9 -2.804890092976709E-12 3.950749936329954E-10 -2.815038972840833E-12
node -1.188283333514607E-15 2.85181468279073E-15 -2.804890092976709E-12 2.366680092391757E-10 -2.31674677818545E-10 6.246148894500908E-12
peri -6.619134343408333E-14 1.772962365700773E-13 3.950749936329954E-10 -2.31674677818545E-10 3.327114935789147E-10 -6.849444300543757E-12
i -3.373002116410315E-15 9.700527325510748E-15 -2.815038972840833E-12 6.246148894500908E-12 -6.849444300543757E-12 1.633360216402525E-11

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

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