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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2144830061990499 7.0543e-08  
a 2.440649799005054 1.879e-08 AU
q 1.917171893035343 1.6619e-07 AU
i 12.34964524190991 8.9039e-06 deg
node 156.0437224398106 2.6239e-05 deg
peri 149.8060755144953 3.2953e-05 deg
M 60.07569903489209 1.858e-05 deg
tp 2456768.090989542208
(2014-Apr-20.59098954)
7.1026e-05 JED
period 1392.696965809939
3.81
1.6083e-05
4.403e-08
d
yr
n .2584912646741052 2.9851e-09 deg/d
Q 2.964127704974765 2.282e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      718  
   data-arc span      8568 days (23.46 yr)  
   first obs. used      1991-08-08  
   last obs. used      2015-01-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51927  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 14:01:52  

Additional Information
 Earth MOID = .914073 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 (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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