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18305 (1981 DL1)
Classification: Main-belt Asteroid          SPK-ID: 2018305
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1504970182631832 4.8971e-08  
a 3.128167068759729 2.2246e-08 au
q 2.657387252282308 1.5797e-07 au
i 13.95426428233219 6.0818e-06 deg
node 322.5595232798116 1.749e-05 deg
peri 34.34317355737033 2.4524e-05 deg
M 246.2556271171066 1.9064e-05 deg
tp 2459838.999786448785
(2022-Sep-16.49978645)
0.00011083 TDB
period 2020.846546476783
5.53
2.1557e-05
5.902e-08
d
yr
n .1781431651144601 1.9003e-09 deg/d
Q 3.598946885237151 2.5594e-08 au
  Orbit Determination Parameters
   # obs. used (total)      819  
   data-arc span      14343 days (39.27 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-05-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54433  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:17  

Additional Information
 Earth MOID = 1.66209 au 
 Jupiter MOID = 1.86753 au 
 T_jup = 3.151 
[ show covariance matrix ]

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 14.17   n/a E2021B10  

18305 (1981 DL1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 DL1 = 1994 PY34 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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