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8026 Johnmckay (1991 JA1)
Classification: Inner Main-belt Asteroid          SPK-ID: 2008026
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07492828858806332 1.0647e-07  
a 1.925339521487372 1.0093e-08 AU
q 1.781077126191363 2.0364e-07 AU
i 19.93228766775222 1.2182e-05 deg
node 217.7362600001071 1.5897e-05 deg
peri 145.8077567193865 5.9816e-05 deg
M 98.49542888008388 5.4347e-05 deg
tp 2456533.523527681002
(2013-Aug-29.02352768)
0.00014745 JED
period 975.7968580638694
2.67
7.6729e-06
2.101e-08
d
yr
n .3689292469277829 2.901e-09 deg/d
Q 2.069601916783382 1.0849e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      659  
   data-arc span      8838 days (24.20 yr)  
   first obs. used      1989-10-27  
   last obs. used      2014-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52509  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jan-22 00:01:12  

Additional Information
 Earth MOID = .7992 AU 
 T_jup = 3.843 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8 mag n/a MPO263420  
rotation period rot_per 372. h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Warner, B.D. (2011) Minor Planet Bul. 38, 33-36.]

8026 Johnmckay           Discovered 1991 May 8 by E. F. Helin at Palomar.
NASA research pilot John McKay (1922-1975) was the fifth pilot to fly the X-15 and made a total of 29 flights. Before joining the X-15 program, he made 46 flights in the X-1 and D-558-II Skyrocket. In 2005 McKay received posthumous NASA astronaut wings for a flight that reached an altitude of 89900 metres.
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

Alternate Designations
 1991 JA1 = 1989 UF2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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