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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2142197200986002 6.9797e-08  
a 2.440748064980874 1.8535e-08 au
q 1.917891697669471 1.6394e-07 au
i 12.34968659211103 8.7421e-06 deg
node 156.0435332042932 2.5814e-05 deg
peri 149.7821274841849 3.2552e-05 deg
M 163.5258336403286 1.8997e-05 deg
tp 2456767.845315072009
(2014-Apr-20.34531507)
7.0886e-05 JED
period 1392.781076261138
3.81
1.5865e-05
4.344e-08
d
yr
n .2584756543120221 2.9443e-09 deg/d
Q 2.963604432292277 2.2506e-08 au
  Orbit Determination Parameters
   # obs. used (total)      743  
   data-arc span      8894 days (24.35 yr)  
   first obs. used      1991-08-08  
   last obs. used      2015-12-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53576  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:50:06  

Additional Information
 Earth MOID = .911971 au 
 Jupiter MOID = 2.35797 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 14.6 mag n/a MPO302201  

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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