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18015 Semenkovich (1999 JD121)
Classification: Main-belt Asteroid          SPK-ID: 2018015
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 .04504086979284493 3.692e-08  
a 2.352330434107759 6.4492e-09 au
q 2.246379425315365 8.697e-08 au
i 6.292661190088715 3.7307e-06 deg
node 190.5255388615588 3.147e-05 deg
peri 334.8115974343309 4.7362e-05 deg
M 120.6684941860892 3.5637e-05 deg
tp 2458954.789919623835
(2020-Apr-15.28991962)
0.00013029 TDB
period 1317.789121410539
3.61
5.4193e-06
1.484e-08
d
yr
n .2731848321942908 1.1235e-09 deg/d
Q 2.458281442900153 6.7397e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1880  
   data-arc span      9764 days (26.73 yr)  
   first obs. used      1994-11-06  
   last obs. used      2021-07-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48591  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:29:25  

Additional Information
 Earth MOID = 1.2543 au 
 Jupiter MOID = 2.50586 au 
 T_jup = 3.547 
[ 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 14.74   n/a MPO636336  
rotation period rot_per 23.907 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]

18015 Semenkovich           Discovered 1999 May 13 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Nicholas Paul Semenkovich (b. 1986) was awarded first place in the 2003 Intel International Science and Engineering Fair for his medicine and health project. He attends the Ladue Horton Watkins High School, Ladue, Missouri, 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

Alternate Designations
 1999 JD121 = 1996 PE1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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