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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07516345493880158 2.4483e-08  
a 1.925047700590191 5.439e-09 au
q 1.780354464491836 4.8927e-08 au
i 19.93471428926159 1.048e-06 deg
node 217.6987822469443 2.5712e-06 deg
peri 145.8098835638009 1.5832e-05 deg
M 264.0891823770143 1.8539e-05 deg
tp 2459460.411659631508
(2021-Sep-02.91165963)
5.074e-05 TDB
period 975.5750163151405
2.67
4.1345e-06
1.132e-08
d
yr
n .3690131399220959 1.5639e-09 deg/d
Q 2.069740936688545 5.8478e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1421  
   data-arc span      11190 days (30.64 yr)  
   first obs. used      1989-10-27  
   last obs. used      2020-06-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46208  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:14:18  

Additional Information
 Earth MOID = .798635 au 
 Jupiter MOID = 3.17193 au 
 T_jup = 3.843 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.94   n/a E2021B10  
diameter diameter 1.690 km 0.239 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 372. h n/a LCDB (Rev. 2020-October); 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] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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