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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .215847371978753 2.8465e-08  
a 2.316908369170728 7.0785e-09 au
q 1.816809786569648 6.6569e-08 au
i 4.074468689391667 3.579e-06 deg
node 28.74042572949478 4.4522e-05 deg
peri 291.5010954826417 4.5233e-05 deg
M 25.44789472314378 1.0266e-05 deg
tp 2459305.443474837422
(2021-Mar-31.94347484)
3.6502e-05 TDB
period 1288.135989839498
3.53
5.9031e-06
1.616e-08
d
yr
n .2794735981601261 1.2807e-09 deg/d
Q 2.817006951771809 8.6063e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1767  
   data-arc span      16363 days (44.80 yr)  
   first obs. used      1975-09-30  
   last obs. used      2020-07-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51777  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:59:47  

Additional Information
 Earth MOID = .808364 au 
 Jupiter MOID = 2.50846 au 
 T_jup = 3.546 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456714.5 (2014-Feb-26.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2164370958690233 2.8578e-08  
q 1.815231708279075 6.6856e-08 au
tp 2456727.829717363419
(2014-Mar-11.32971736)
3.1428e-05 TDB
node 28.82567165158634 4.4589e-05 deg
peri 291.2091001508898 4.5285e-05 deg
i 4.073004366243116 3.5756e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1767  
   data-arc span      16363 days (44.80 yr)  
   first obs. used      1975-09-30  
   last obs. used      2020-07-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51777  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:59:47  

Additional Information
 Jupiter MOID = 2.50846 au 
 T_jup = 3.546 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.166926575585831E-16 -1.904204553390332E-15 -3.442763479305023E-14 1.366755667925448E-15 -9.097819451673821E-16 -3.836876556934402E-16
q -1.904204553390332E-15 4.469694977269212E-15 1.26239651139496E-13 -3.213637855029473E-15 1.29825576282773E-14 9.347326830945004E-16
tp -3.442763479305023E-14 1.26239651139496E-13 9.877342509007821E-10 5.2781875874381E-12 2.569857533130317E-10 -8.715049186391749E-14
node 1.366755667925448E-15 -3.213637855029473E-15 5.2781875874381E-12 1.98820970412057E-9 -1.981573924804504E-9 6.728589399446454E-12
peri -9.097819451673821E-16 1.29825576282773E-14 2.569857533130317E-10 -1.981573924804504E-9 2.050760999989771E-9 -6.735981470661942E-12
i -3.836876556934402E-16 9.347326830945004E-16 -8.715049186391749E-14 6.728589399446454E-12 -6.735981470661942E-12 1.278469587403197E-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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