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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08068278748253807 3.7376e-08  
a 2.744995682940594 9.4943e-09 au
q 2.523521779613414 1.0297e-07 au
i 1.332322238210659 4.0273e-06 deg
node 5.274224193170242 0.00013579 deg
peri 350.1054738996318 0.00013742 deg
M 229.1113991313698 2.2427e-05 deg
tp 2460000.462883785603
(2023-Feb-24.96288379)
0.00010413 TDB
period 1661.157936748389
4.55
8.6183e-06
2.36e-08
d
yr
n .2167162989358358 1.1244e-09 deg/d
Q 2.966469586267774 1.026e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3514  
   data-arc span      32374 days (88.64 yr)  
   first obs. used      1932-12-17  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 09:04:15  

Additional Information
 Earth MOID = 1.51782 au 
 Jupiter MOID = 2.38974 au 
 T_jup = 3.343 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456902.5 (2014-Sep-02.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07942838783229134 3.7077e-08  
q 2.527097708717299 1.0201e-07 au
tp 2456666.157854753911
(2014-Jan-08.65785475)
0.00010395 TDB
node 5.310767622054168 0.00013555 deg
peri 347.9819440087081 0.00013727 deg
i 1.335785916278982 4.0232e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3514  
   data-arc span      32374 days (88.64 yr)  
   first obs. used      1932-12-17  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 09:04:15  

Additional Information
 Jupiter MOID = 2.38974 au 
 T_jup = 3.343 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.374672481996996E-15 -3.768470293147123E-15 9.191670295877373E-13 2.150331113048151E-15 1.718958903968837E-13 1.678783976596683E-16
q -3.768470293147123E-15 1.0406506331344E-14 -2.438245338477094E-12 -6.07054669082188E-15 -4.534286280707104E-13 -4.552247010289887E-16
tp 9.191670295877373E-13 -2.438245338477094E-12 1.080556051864093E-8 -1.04791318608028E-11 2.261316004765374E-9 -3.686616742547436E-13
node 2.150331113048151E-15 -6.07054669082188E-15 -1.04791318608028E-11 1.837376650421004E-8 -1.83707255098271E-8 2.65771992982098E-11
peri 1.718958903968837E-13 -4.534286280707104E-13 2.261316004765374E-9 -1.83707255098271E-8 1.884322405466333E-8 -2.66519597021417E-11
i 1.678783976596683E-16 -4.552247010289887E-16 -3.686616742547436E-13 2.65771992982098E-11 -2.66519597021417E-11 1.618631625509638E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.17   n/a MPO636105  
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. 2020-October); 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

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 ]
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