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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1685327564002502 3.313e-08  
a 2.273716279189305 8.726e-09 au
q 1.890520607385411 7.7266e-08 au
i 6.01472428575532 4.1386e-06 deg
node 80.84461255909157 3.6373e-05 deg
peri 229.3887542648155 3.9187e-05 deg
M 244.1332658242558 1.7421e-05 deg
tp 2459003.550161064528
(2020-Jun-03.05016106)
6.1615e-05 TDB
period 1252.284005546825
3.43
7.2089e-06
1.974e-08
d
yr
n .2874747249069922 1.6549e-09 deg/d
Q 2.6569119509932 1.0197e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1321  
   data-arc span      9854 days (26.98 yr)  
   first obs. used      1992-04-29  
   last obs. used      2019-04-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49631  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:41:09  

Additional Information
 Earth MOID = .881572 au 
 Jupiter MOID = 2.59337 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 15.0   n/a MPO435889  
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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