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18315 (1981 ED37)
Classification: Main-belt Asteroid          SPK-ID: 2018315
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2158473707372492 2.8376e-08  
a 2.316908369509763 7.0321e-09 au
q 1.816809789711953 6.6312e-08 au
i 4.074468608411355 3.5767e-06 deg
node 28.74042556283063 4.4424e-05 deg
peri 291.5010956376092 4.5135e-05 deg
M 25.44789445001792 1.0201e-05 deg
tp 2459305.443475794722
(2021-Mar-31.94347579)
3.6273e-05 TDB
period 1288.135990122238
3.53
5.8645e-06
1.606e-08
d
yr
n .2794735980987828 1.2724e-09 deg/d
Q 2.817006949307572 8.5499e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1791  
   data-arc span      16739 days (45.83 yr)  
   first obs. used      1975-09-30  
   last obs. used      2021-07-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:32:27  

Additional Information
 Earth MOID = .808364 au 
 Jupiter MOID = 2.50846 au 
 T_jup = 3.546 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456731.5 (2014-Mar-15.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2164343929867939 2.8488e-08  
q 1.815232121549822 6.6596e-08 au
tp 2456727.825654055920
(2014-Mar-11.32565406)
3.1308e-05 TDB
node 28.82533130660115 4.4491e-05 deg
peri 291.2076303632184 4.5188e-05 deg
i 4.073012602767615 3.5734e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1791  
   data-arc span      16739 days (45.83 yr)  
   first obs. used      1975-09-30  
   last obs. used      2021-07-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:32:27  

Additional Information
 Jupiter MOID = 2.50846 au 
 T_jup = 3.546 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.11538539373038E-16 -1.890836448549654E-15 -2.816318498979775E-14 1.403455978967802E-15 3.45865483676493E-16 -3.805930672777058E-16
q -1.890836448549654E-15 4.435032485405422E-15 1.10073248730561E-13 -3.356741810301682E-15 9.790965033040527E-15 9.252322021227971E-16
tp -2.816318498979775E-14 1.10073248730561E-13 9.801814171834466E-10 4.926471031436552E-12 2.557816482455989E-10 -1.037592363902356E-13
node 1.403455978967802E-15 -3.356741810301682E-15 4.926471031436552E-12 1.979466898335734E-9 -1.972938107509195E-9 6.355048244388509E-12
peri 3.45865483676493E-16 9.790965033040527E-15 2.557816482455989E-10 -1.972938107509195E-9 2.041911923049815E-9 -6.367324757507564E-12
i -3.805930672777058E-16 9.252322021227971E-16 -1.037592363902356E-13 6.355048244388509E-12 -6.367324757507564E-12 1.276900771135842E-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 14.8   n/a MPO467907  
diameter diameter 2.965 km 0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.241   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18315 (1981 ED37)          Discovered 1981-Mar-11 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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