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JPL Small-Body Database Browser
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8026 Johnmckay (1991 JA1)
Classification: Inner Main-belt Asteroid          SPK-ID: 2008026
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07495210969157816 5.545e-08  
a 1.925181806175092 6.4046e-09 au
q 1.780885368262426 1.0799e-07 au
i 19.93542756143175 6.6099e-06 deg
node 217.7071609459074 1.121e-05 deg
peri 145.9406280179281 3.5447e-05 deg
M 42.54501261959956 3.412e-05 deg
tp 2458485.193920496849
9.2364e-05 TDB
period 975.6769610643267
n .3689745831522869 1.8412e-09 deg/d
Q 2.069478244087758 6.8846e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1089  
   data-arc span      10660 days (29.19 yr)  
   first obs. used      1989-10-27  
   last obs. used      2019-01-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47591  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:53:29  

Additional Information
 Earth MOID = .799552 au 
 Jupiter MOID = 3.17336 au 
 T_jup = 3.843 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9   n/a MPO337323  
diameter diameter 1.690 km 0.239 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 372. h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2011) Minor Planet Bull. 38, 33-36.]
[Warner, B.D. (2015) Minor Planet Bull. 42, 267-276.]
geometric albedo albedo 0.815   0.196 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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 
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