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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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1837478509342519 4.4984e-08  
a 2.287461687392412 7.2896e-09 au
q 1.867145518239619 1.021e-07 au
i 5.256067435065164 3.6405e-06 deg
node 119.5026356185464 5.0848e-05 deg
peri 233.0597348131193 5.1542e-05 deg
M 346.9608867695266 9.7258e-06 deg
tp 2459246.269348026215
(2021-Jan-31.76934803)
3.4213e-05 TDB
period 1263.656891246979
3.46
6.0405e-06
1.654e-08
d
yr
n .2848874583707223 1.3618e-09 deg/d
Q 2.707777856545206 8.6291e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1390  
   data-arc span      10457 days (28.63 yr)  
   first obs. used      1992-04-26  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49652  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:05  

Additional Information
 Earth MOID = .865166 au 
 Jupiter MOID = 2.72587 au 
 T_jup = 3.573 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456647.5 (2013-Dec-21.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1831857473121159 4.4726e-08  
q 1.868356004370091 1.0144e-07 au
tp 2456718.211833880190
(2014-Mar-01.71183388)
3.2603e-05 TDB
node 119.5536192585483 5.0796e-05 deg
peri 232.8491074172546 5.151e-05 deg
i 5.257838238416634 3.6412e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1390  
   data-arc span      10457 days (28.63 yr)  
   first obs. used      1992-04-26  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49652  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:05  

Additional Information
 Jupiter MOID = 2.72587 au 
 T_jup = 3.573 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.000446630056047E-15 -4.529732724303626E-15 3.238062174662183E-13 1.839956716551283E-14 7.11334236492284E-14 -2.268582345196393E-15
q -4.529732724303626E-15 1.029075766867519E-14 -7.425825324373698E-13 -4.086084140773567E-14 -1.656027423784898E-13 5.166028828440434E-15
tp 3.238062174662183E-13 -7.425825324373698E-13 1.062967376865546E-9 6.800368813725058E-12 3.039015429255889E-10 -8.275163204459972E-14
node 1.839956716551283E-14 -4.086084140773567E-14 6.800368813725058E-12 2.580247463903453E-9 -2.567233639127134E-9 4.876623466008946E-11
peri 7.11334236492284E-14 -1.656027423784898E-13 3.039015429255889E-10 -2.567233639127134E-9 2.653250674157141E-9 -4.858508166271427E-11
i -2.268582345196393E-15 5.166028828440434E-15 -8.275163204459972E-14 4.876623466008946E-11 -4.858508166271427E-11 1.325837931539817E-11

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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