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20441 Elijahmena (1999 JH50)
Classification: Main-belt Asteroid          SPK-ID: 2020441
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 .1837478524989545 4.4998e-08  
a 2.287461685491623 7.2924e-09 au
q 1.867145513108898 1.0213e-07 au
i 5.256067443759137 3.6408e-06 deg
node 119.502635949216 5.0935e-05 deg
peri 233.0597350268398 5.1629e-05 deg
M 346.9608866909689 9.7329e-06 deg
tp 2459246.269348244916
(2021-Jan-31.76934825)
3.4237e-05 TDB
period 1263.656889671905
3.46
6.0428e-06
1.654e-08
d
yr
n .2848874587258176 1.3623e-09 deg/d
Q 2.707777857874347 8.6323e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1383  
   data-arc span      10457 days (28.63 yr)  
   first obs. used      1992-04-26  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49596  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:47:51  

Additional Information
 Earth MOID = .865166 au 
 Jupiter MOID = 2.72587 au 
 T_jup = 3.573 
[ 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 15.18   n/a E2021B10  
diameter diameter 2.710 km 0.105 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.832 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.]
geometric albedo albedo 0.240   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20441 Elijahmena           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Elijah Login Mena (b. 1991) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his botany and zoology project. He attends the Ledyard Middle School, Gales Ferry, Connecticut.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

Alternate Designations
 1999 JH50 = 2000 TN25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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