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22320 (1991 PH18)
Classification: Main-belt Asteroid          SPK-ID: 2022320
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 .2145689306447627 7.9568e-08  
a 2.441033461393977 2.1497e-08 AU
q 1.917263521914588 1.9287e-07 AU
i 12.34916475480688 9.6622e-06 deg
node 156.0430895792524 3.0149e-05 deg
peri 149.833788500224 3.6321e-05 deg
M 8.357570224891868 1.878e-05 deg
tp 2456768.160257347273
(2014-Apr-20.66025735)
7.2524e-05 JED
period 1393.02537001802
3.81
1.8402e-05
5.038e-08
d
yr
n .2584303256410492 3.4138e-09 deg/d
Q 2.964803400873366 2.611e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      595  
   data-arc span      8363 days (22.90 yr)  
   first obs. used      1991-08-08  
   last obs. used      2014-07-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55221  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:48:20  

Additional Information
 Earth MOID = .912261 AU 
 T_jup = 3.439 
[ 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 14.5 mag n/a MPO266072  

22320 (1991 PH18)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar (675)
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 PH18 = 1998 HU112 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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