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20122 (1995 WH17)
Classification: Main-belt Asteroid          SPK-ID: 2020122
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2790041997340698 4.0879e-08  
a 2.721837739026474 1.3862e-08 au
q 1.962433578843403 1.1407e-07 au
i 11.02640327220514 4.158e-06 deg
node 70.69444310434434 2.3418e-05 deg
peri 304.8376449967528 2.4718e-05 deg
M 231.0358900385352 1.05e-05 deg
tp 2459788.068004206876
(2022-Jul-27.56800421)
5.1131e-05 TDB
period 1640.180989716286
4.49
1.253e-05
3.431e-08
d
yr
n .2194879725208081 1.6768e-09 deg/d
Q 3.481241899209545 1.773e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1111  
   data-arc span      9251 days (25.33 yr)  
   first obs. used      1995-10-21  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4753  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:13:32  

Additional Information
 Earth MOID = .987349 au 
 Jupiter MOID = 2.05611 au 
 T_jup = 3.275 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.49   n/a E2021B10  
diameter diameter 3.686 km 1.244 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.272   0.175 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20122 (1995 WH17)          Discovered 1995-Nov-28 by Shimizu, Y., Urata, T. at Nachi-Katsuura
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1995 WH17 = 1999 OV3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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