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JPL Small-Body Database Browser
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2835 Ryoma (1982 WF)
Classification: Main-belt Asteroid          SPK-ID: 2002835
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08026798174948699 4.0863e-08  
a 2.746052342293117 1.0764e-08 au
q 2.525632262998797 1.1185e-07 au
i 1.33217413145842 4.3102e-06 deg
node 5.27614373654789 0.0001537 deg
peri 350.0294362335779 0.00015538 deg
M 143.3988180137847 2.3257e-05 deg
tp 2458338.428772992291
(2018-Aug-07.92877299)
0.00010733 TDB
period 1662.117198900924
4.55
9.7727e-06
2.676e-08
d
yr
n .2165912248775538 1.2735e-09 deg/d
Q 2.966472421587437 1.1628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2742  
   data-arc span      31825 days (87.13 yr)  
   first obs. used      1932-12-17  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46324  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:32:12  

Additional Information
 Earth MOID = 1.52074 au 
 Jupiter MOID = 2.39013 au 
 T_jup = 3.343 
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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 12.1   n/a MPO458857  
diameter diameter 24.230 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.234 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.043   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2835 Ryoma (1982 WF)          Discovered 1982-Nov-20 by Seki, T. at Geisei
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1982 WF = 1932 YB = 1941 WB = 1961 CB1 = 1963 QC = 1972 NT = 1975 EX3 = 1977 QF5 = 1977 RY7 = 1979 AA = 1980 GP = 1989 GQ8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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