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20444 Mamesser (1999 JK63)
Classification: Main-belt Asteroid          SPK-ID: 2020444
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1683140153025952 2.9453e-08  
a 2.273790969654975 6.3663e-09 au
q 1.891080081593565 6.6655e-08 au
i 6.01372751651695 2.8469e-06 deg
node 80.83882405251492 3.4836e-05 deg
peri 229.2016043784899 3.6412e-05 deg
M 56.75454831712324 1.0365e-05 deg
tp 2459003.065791141789
(2020-Jun-02.56579114)
3.6195e-05 TDB
period 1252.345711427531
3.43
5.2596e-06
1.44e-08
d
yr
n .2874605603828363 1.2073e-09 deg/d
Q 2.656501857716385 7.4378e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1826  
   data-arc span      10538 days (28.85 yr)  
   first obs. used      1992-04-29  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45924  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:13  

Additional Information
 Earth MOID = .880875 au 
 Jupiter MOID = 2.59402 au 
 T_jup = 3.584 
[ 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 15.05   n/a E2021B10  
diameter diameter 2.464 km 0.215 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.319   0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20444 Mamesser           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Mary Anne Messer (b. 1989) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her behavioral science project. She attends the Presbyterian Christian School, Hattiesburg, Mississippi.
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 JK63 = 1992 HN3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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