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22320 (1991 PH18)
Classification: Main-belt Asteroid          SPK-ID: 2022320
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2133486355959052 3.1218e-08  
a 2.441149717391625 1.0837e-08 au
q 1.920333755900792 7.5748e-08 au
i 12.34430663284474 4.2945e-06 deg
node 155.9995035847047 1.6489e-05 deg
peri 149.9919577806425 1.9988e-05 deg
M 268.2427617302751 1.3238e-05 deg
tp 2459555.581367204741
(2021-Dec-07.08136720)
5.2616e-05 TDB
period 1393.124886975635
3.81
9.2768e-06
2.54e-08
d
yr
n .2584118648411571 1.7208e-09 deg/d
Q 2.961965678882458 1.3149e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1568  
   data-arc span      10812 days (29.60 yr)  
   first obs. used      1991-08-08  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50824  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:04:27  

Additional Information
 Earth MOID = .914234 au 
 Jupiter MOID = 2.37083 au 
 T_jup = 3.439 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.63   n/a E2021B10  
diameter diameter 6.016 km 0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.083   0.001 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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