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18601 Zafar (1998 BL11)
Classification: Main-belt Asteroid          SPK-ID: 2018601
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1473829531131828 2.9621e-08  
a 2.409161954741141 8.4856e-09 au
q 2.054092551323464 7.283e-08 au
i 3.240221917586034 3.3556e-06 deg
node 98.26011906997273 5.8602e-05 deg
peri 111.5922892601657 5.9874e-05 deg
M 274.2621920055061 1.3693e-05 deg
tp 2459325.787441331876
(2021-Apr-21.28744133)
5.2616e-05 TDB
period 1365.832432839849
3.74
7.2161e-06
1.976e-08
d
yr
n .2635755245989329 1.3926e-09 deg/d
Q 2.764231358158819 9.7362e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1582  
   data-arc span      10617 days (29.07 yr)  
   first obs. used      1991-03-23  
   last obs. used      2020-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52673  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:51:07  

Additional Information
 Earth MOID = 1.05131 au 
 Jupiter MOID = 2.20043 au 
 T_jup = 3.504 
[ 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 14.8   n/a MPO452434  
diameter diameter 3.011 km 0.206 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.123   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18601 Zafar           Discovered 1998 Jan. 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Abu-Bakr Zafar (b. 1985) was awarded second place in the 2003 Intel International Science and Engineering Fair for his zoology project. He attends the Panama City Advanced School, Panama City, Florida, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040614/MPCPages.arcLast Updated: 2009-12-11

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Alternate Designations
 1998 BL11 = 1991 FU4 = 1999 NF14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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