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8023 Josephwalker (1991 DD)
Classification: Main-belt Asteroid          SPK-ID: 2008023
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1332394707660283 6.3556e-08  
a 2.436363442104134 1.5242e-08 au
q 2.11174366648448 1.5104e-07 au
i 2.471157736999891 6.1537e-06 deg
node 35.29486074363727 0.0001484 deg
peri 93.3031013011221 0.00015033 deg
M 263.5719166893537 2.581e-05 deg
tp 2457972.559648894196
(2017-Aug-07.05964889)
0.00010121 JED
period 1389.029720422978
3.80
1.3035e-05
3.569e-08
d
yr
n .2591737201205279 2.4322e-09 deg/d
Q 2.760983217723787 1.7273e-08 au
  Orbit Determination Parameters
   # obs. used (total)      984  
   data-arc span      23285 days (63.75 yr)  
   first obs. used      1951-11-29  
   last obs. used      2015-08-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51553  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-05 13:35:33  

Additional Information
 Earth MOID = 1.12706 au 
 Jupiter MOID = 2.28976 au 
 T_jup = 3.491 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2 mag n/a MPO279599  

8023 Josephwalker           Discovered 1991 Feb. 17 by T. Urata at Oohira.
NASA research pilot Joseph Walker (1921-1966) was the second pilot to fly the X-15 and made a total of 25 flights. Three of these flights entered space and he received NASA astronaut wings posthumously in 2005.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120207/MPCPages.arcLast Updated: 2012-02-09

[ show close-approach data ]
Alternate Designations
 1991 DD = 1993 TR18 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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