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27688 (1981 EX23)
Classification: Main-belt Asteroid          SPK-ID: 2027688
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09303631990364959 3.4013e-08  
a 2.775513751104151 1.7308e-08 au
q 2.517290165859446 9.667e-08 au
i 2.315940671879553 4.411e-06 deg
node 253.9117204009708 0.00011362 deg
peri 36.12932955337728 0.00011714 deg
M 64.60051209433399 2.8156e-05 deg
tp 2458697.427199629820
(2019-Aug-01.92719963)
0.00013179 TDB
period 1688.93720182807
4.62
1.5799e-05
4.326e-08
d
yr
n .2131517972428718 1.9939e-09 deg/d
Q 3.033737336348855 1.8919e-08 au
  Orbit Determination Parameters
   # obs. used (total)      874  
   data-arc span      15523 days (42.50 yr)  
   first obs. used      1977-05-18  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55346  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 01:40:38  

Additional Information
 Earth MOID = 1.50146 au 
 Jupiter MOID = 2.09813 au 
 T_jup = 3.328 
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Orbital Elements at Epoch 2456507.5 (2013-Aug-03.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09343248791637815 3.3743e-08  
q 2.516112647242266 9.6058e-08 au
tp 2457014.087462939541
(2014-Dec-22.58746294)
0.00013161 TDB
node 253.9640558942914 0.00011375 deg
peri 37.54812541776553 0.00011728 deg
i 2.314068275081056 4.4118e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      874  
   data-arc span      15523 days (42.50 yr)  
   first obs. used      1977-05-18  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55346  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 01:40:38  

Additional Information
 Jupiter MOID = 2.09813 au 
 T_jup = 3.328 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.138595813816316E-15 -3.197710158749371E-15 -2.860102281178783E-14 -2.804093241949716E-15 -2.733547831769805E-14 -1.001166861574157E-16
q -3.197710158749371E-15 9.227058585384736E-15 -1.02229493001097E-14 1.085962023011746E-14 3.542501271060165E-14 3.74981059654745E-16
tp -2.860102281178783E-14 -1.02229493001097E-14 1.732155983055578E-8 -1.134924683315888E-11 3.780829131430943E-9 -2.008941603130056E-12
node -2.804093241949716E-15 1.085962023011746E-14 -1.134924683315888E-11 1.293972147895736E-8 -1.293127240977102E-8 -1.522317521629236E-10
peri -2.733547831769805E-14 3.542501271060165E-14 3.780829131430943E-9 -1.293127240977102E-8 1.375470033849307E-8 1.51657564640177E-10
i -1.001166861574157E-16 3.74981059654745E-16 -2.008941603130056E-12 -1.522317521629236E-10 1.51657564640177E-10 1.946377798601953E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9   n/a MPO474127  
diameter diameter 2.781 km 0.436 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.301   0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27688 (1981 EX23)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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