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21460 Ryozo (1998 HP52)
Classification: Main-belt Asteroid          SPK-ID: 2021460
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039136600763028 2.9382e-08  
a 2.283193856803436 6.4488e-09 au
q 1.817619440798917 6.5412e-08 au
i 2.267643163972937 3.4425e-06 deg
node 122.962941446735 7.409e-05 deg
peri 131.5647086115126 7.4556e-05 deg
M 180.275058174831 8.845e-06 deg
tp 2459829.598223354477
(2022-Sep-07.09822335)
3.1896e-05 TDB
period 1260.122040422859
3.45
5.3387e-06
1.462e-08
d
yr
n .2856866148291436 1.2104e-09 deg/d
Q 2.748768272807954 7.7638e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1366  
   data-arc span      10872 days (29.77 yr)  
   first obs. used      1991-04-09  
   last obs. used      2021-01-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51858  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:45  

Additional Information
 Earth MOID = .802234 au 
 Jupiter MOID = 2.30098 au 
 T_jup = 3.575 
[ 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 15.17   n/a E2020-QM5  

21460 Ryozo           Discovered 1998 Apr. 30 by T. Okuni at Nanyo.
Ryozo Suzuki (b. 1928) is an amateur astronomer and a manufacturer of high-end binoculars for amateur astronomers.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040504/MPCPages.arcLast Updated: 2004-05-11

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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