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18314 (1981 EX27)
Classification: Main-belt Asteroid          SPK-ID: 2018314
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1578631588494944 3.9822e-08  
a 2.366452122412506 7.7333e-09 au
q 1.992876515102377 9.5422e-08 au
i .302975534072262 3.7961e-06 deg
node 156.6750626981553 0.00077794 deg
peri 57.61546351748327 0.00077801 deg
M 308.7137159111535 1.1152e-05 deg
tp 2459389.927812160793
(2021-Jun-24.42781216)
4.1432e-05 TDB
period 1329.673490474544
3.64
6.5179e-06
1.785e-08
d
yr
n .2707431580601946 1.3271e-09 deg/d
Q 2.740027729722635 8.9541e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      14652 days (40.11 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:42:30  

Additional Information
 Earth MOID = .985358 au 
 Jupiter MOID = 2.22537 au 
 T_jup = 3.531 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456978.5 (2014-Nov-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579652498648092 3.9828e-08  
q 1.992600828232991 9.5441e-08 au
tp 2456731.388920525950
(2014-Mar-14.88892053)
3.9925e-05 TDB
node 156.5684232045813 0.00077971 deg
peri 57.85363564923914 0.00077978 deg
i .302372522726277 3.795e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      14652 days (40.11 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:42:30  

Additional Information
 Jupiter MOID = 2.22537 au 
 T_jup = 3.531 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.586252455325651E-15 -3.792592149865181E-15 -5.876035560451709E-15 -1.089509806098097E-14 2.689229763224067E-14 -1.523608712340586E-16
q -3.792592149865181E-15 9.108975469885612E-15 1.447774941115883E-15 2.531788498439396E-14 -6.55656927233222E-14 3.798689243594723E-16
tp -5.876035560451709E-15 1.447774941115883E-15 1.594040236810498E-9 6.001819385321237E-12 4.427871234557647E-10 -2.288169356444468E-14
node -1.089509806098097E-14 2.531788498439396E-14 6.001819385321237E-12 6.0795049203219E-7 -6.079403182384658E-7 5.876060292960716E-10
peri 2.689229763224067E-14 -6.55656927233222E-14 4.427871234557647E-10 -6.079403182384658E-7 6.080646185846191E-7 -5.876040334023607E-10
i -1.523608712340586E-16 3.798689243594723E-16 -2.288169356444468E-14 5.876060292960716E-10 -5.876040334023607E-10 1.440213940869941E-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 15.68   n/a MPCxxxxx  
diameter diameter 1.914 km 0.300 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.304   0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18314 (1981 EX27)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EX27 = 1997 RN10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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