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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 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2145688711179934 8.5011e-08  
a 2.441033447937795 2.1834e-08 AU
q 1.917263656652519 2.0656e-07 AU
i 12.34916688340093 1.0152e-05 deg
node 156.0430792726818 3.2811e-05 deg
peri 149.8338079503353 3.8971e-05 deg
M 8.357568050257317 2.0049e-05 deg
tp 2456768.160266029463
(2014-Apr-20.66026603)
7.742e-05 JED
period 1393.025358499454
3.81
1.869e-05
5.117e-08
d
yr
n .2584303277779427 3.4674e-09 deg/d
Q 2.964803239223071 2.6519e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      569  
   data-arc span      7998 days (21.90 yr)  
   first obs. used      1991-08-08  
   last obs. used      2013-07-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58246  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 19:57:38  

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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