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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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .214482999452847 7.5795e-08  
a 2.440649802491562 2.0014e-08 AU
q 1.917171912239173 1.8148e-07 AU
i 12.34964822069697 9.6479e-06 deg
node 156.0437114501423 2.8267e-05 deg
peri 149.806086729332 3.4903e-05 deg
M 60.07569676012145 1.8725e-05 deg
tp 2456768.090997844391
(2014-Apr-20.59099784)
7.1516e-05 JED
period 1392.696968794174
3.81
1.7131e-05
4.69e-08
d
yr
n .2584912641202167 3.1796e-09 deg/d
Q 2.964127692743951 2.4307e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      607  
   data-arc span      8392 days (22.98 yr)  
   first obs. used      1991-08-08  
   last obs. used      2014-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54715  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:37:31  

Additional Information
 Earth MOID = .914074 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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