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18216 (4917 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2018216
[ 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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06805940449627479 7.8005e-08  
a 2.514734862902417 1.0176e-08 au
q 2.343583505667258 1.9531e-07 au
i 2.199997424778596 4.8232e-06 deg
node 18.76675752155361 9.4145e-05 deg
peri 190.214908044621 0.00011285 deg
M 186.8253840872957 6.9181e-05 deg
tp 2459901.177970155947
(2022-Nov-17.67797016)		 0.00028051 TDB
period 1456.588010469704
3.99		 8.8416e-06
2.421e-08		 d
yr
n .247152933713845 1.5002e-09 deg/d
Q 2.685886220137577 1.0869e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1319  
   data-arc span      22079 days (60.45 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50325  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:25:16  

Additional Information
 Earth MOID = 1.33725 au 
 Jupiter MOID = 2.27345 au 
 T_jup = 3.455 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.87   n/a E2021B10  
diameter diameter 3.104 km 0.203 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.167   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18216 (4917 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

Alternate Designations
 4917 P-L = 1996 TP64 = 1998 BR11 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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