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21626 Matthewhall (1999 NP2)
Classification: Main-belt Asteroid          SPK-ID: 2021626
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1809965496594354 3.7431e-08  
a 2.25400064890193 6.6417e-09 au
q 1.846034308520552 8.4466e-08 au
i 5.238967133256729 4.5623e-06 deg
node 200.1835571142148 3.892e-05 deg
peri 124.8572544639981 4.0468e-05 deg
M 115.7767855779295 1.1761e-05 deg
tp 2458802.989624386361
(2019-Nov-15.48962439)
3.9798e-05 TDB
period 1236.031338290928
3.38
5.4632e-06
1.496e-08
d
yr
n .2912547512733579 1.2873e-09 deg/d
Q 2.661966989283308 7.8438e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1494  
   data-arc span      14096 days (38.59 yr)  
   first obs. used      1982-07-16  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50195  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:50:45  

Additional Information
 Earth MOID = .838624 au 
 Jupiter MOID = 2.68196 au 
 T_jup = 3.598 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.94   n/a E2021B10  
diameter diameter 3.241 km 0.785 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
geometric albedo albedo 0.085   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21626 Matthewhall           Discovered 1999 July 12 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Matthew J. Hall (b. 1987) was awarded first place in the 2005 Intel International Science and Engineering Fair for his mathematics team project. He attends the Bishop Feehan High School, Attleboro, Massachusetts, 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: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 NP2 = 1998 FK25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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