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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1334810099054108 6.5754e-08  
a 2.435905293612302 1.5279e-08 AU
q 2.110758194986996 1.5693e-07 AU
i 2.471253248381887 6.9904e-06 deg
node 35.30430840648827 0.00015202 deg
peri 93.17779672784408 0.0001545 deg
M 108.201571535444 2.7987e-05 deg
tp 2456583.131091590689
(2013-Oct-17.63109159)
0.0001068 JED
period 1388.637936539888
3.80
1.3065e-05
3.577e-08
d
yr
n .2592468421948944 2.4391e-09 deg/d
Q 2.761052392237608 1.7318e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      943  
   data-arc span      23222 days (63.58 yr)  
   first obs. used      1951-11-29  
   last obs. used      2015-06-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52517  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:58:20  

Additional Information
 Earth MOID = 1.12767 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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