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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037483280395835 2.9373e-08  
a 2.283475955395 6.4317e-09 au
q 1.818221547364678 6.5405e-08 au
i 2.267707267861261 3.3991e-06 deg
node 122.9617984828444 7.3039e-05 deg
peri 131.5664517516955 7.3489e-05 deg
M 236.2550594497989 8.84e-06 deg
tp 2459829.729520311664
(2022-Sep-07.22952031)
3.1643e-05 TDB
period 1260.355588024448
3.45
5.3249e-06
1.458e-08
d
yr
n .2856336762582092 1.2068e-09 deg/d
Q 2.748730363425322 7.7421e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1385  
   data-arc span      10941 days (29.95 yr)  
   first obs. used      1991-04-09  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51674  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 10:14:19  

Additional Information
 Earth MOID = .804585 au 
 Jupiter MOID = 2.2998 au 
 T_jup = 3.575 
[ 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 15.19   n/a MPCxxxxx  

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