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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2137675245026952 6.9122e-08  
a 2.441664817371448 1.8205e-08 au
q 1.919716173696628 1.6192e-07 au
i 12.34875262552781 7.7148e-06 deg
node 156.04466715 2.3525e-05 deg
peri 149.7610888695974 2.8574e-05 deg
M 215.2275011375481 1.7673e-05 deg
tp 2458160.916695306901
(2018-Feb-11.41669531)
7.2095e-05 JED
period 1393.56584914768
3.82
1.5585e-05
4.267e-08
d
yr
n .2583300962923137 2.8891e-09 deg/d
Q 2.963613461046268 2.2096e-08 au
  Orbit Determination Parameters
   # obs. used (total)      813  
   data-arc span      8974 days (24.57 yr)  
   first obs. used      1991-08-08  
   last obs. used      2016-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53189  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:42:53  

Additional Information
 Earth MOID = .915222 au 
 Jupiter MOID = 2.35902 au 
 T_jup = 3.438 
[ 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 14.7 mag n/a MPO365518  

22320 (1991 PH18)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar
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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