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5558 Johnnapier (1989 WL2)
Classification: Inner Main-belt Asteroid          SPK-ID: 2005558
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1128234154165505 7.2457e-08  
a 1.935333275889526 1.1233e-08 AU
q 1.716982365734368 1.4153e-07 AU
i 23.38243094983918 8.2295e-06 deg
node 138.9087058744449 1.9231e-05 deg
peri 264.7730597402905 5.1223e-05 deg
M 126.5397230247034 5.6291e-05 deg
tp 2456654.834169227410
(2013-Dec-28.33416923)
0.00015208 JED
period 983.4042315221354
2.69
8.5615e-06
2.344e-08
d
yr
n .3660753009398626 3.1871e-09 deg/d
Q 2.153684186044683 1.25e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      732  
   data-arc span      13388 days (36.65 yr)  
   first obs. used      1978-10-24  
   last obs. used      2015-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50745  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:51:50  

Additional Information
 Earth MOID = .831788 AU 
 T_jup = 3.801 
[ 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 14.1 mag n/a MPO324358  
rotation period rot_per 73.9 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Warner, B.D. (2009) Minor Planet Bul. 36, 109-116.]

5558 Johnnapier           Discovered 1989 Nov. 24 by R. H. McNaught at Siding Spring.
John Napier of Merchiston (1550-1617) was a Scottish mathematician and inventor, who simplified complex calculations through his invention of logarithms, the calculating tool called Napier's bones, and development of the decimal point. Kepler acknowledged the importance of Napier's logarithms in his calculations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-08-10Last Updated: 2014-08-13
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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