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18221 (6526 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2018221
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1419580980620677 3.9722e-08  
a 3.165872209242493 1.8102e-08 au
q 2.716451011710872 1.2723e-07 au
i 18.1150202202742 4.5984e-06 deg
node 179.216361928257 1.0614e-05 deg
peri 183.4831523114901 1.6228e-05 deg
M 257.9437061334375 1.3465e-05 deg
tp 2459979.778260395563
(2023-Feb-04.27826040)
8.0002e-05 TDB
period 2057.493622264486
5.63
1.7647e-05
4.831e-08
d
yr
n .1749701656930448 1.5007e-09 deg/d
Q 3.615293406774114 2.0672e-08 au
  Orbit Determination Parameters
   # obs. used (total)      913  
   data-arc span      22178 days (60.72 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-06-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .503  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:35:09  

Additional Information
 Earth MOID = 1.71308 au 
 Jupiter MOID = 1.84434 au 
 T_jup = 3.111 
[ 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 14.46   n/a MPO614063  
diameter diameter 7.127 km 0.290 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.073   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18221 (6526 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 6526 P-L = 1997 ED31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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