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4455 Ruriko (1988 XA)
Classification: Main-belt Asteroid          SPK-ID: 2004455
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 .05186741917298678 8.7618e-09  
a 3.013864420625004 1.3038e-08 au
q 2.857543051389897 2.4817e-08 au
i 9.402458804694973 7.6533e-07 deg
node 243.65887284367 2.1391e-06 deg
peri 230.1795941664894 2.7402e-05 deg
M 43.04898739316281 2.5062e-05 deg
tp 2459167.969361079267
(2020-Nov-14.46936108)
0.00013302 TDB
period 1911.102559976372
5.23
1.2401e-05
3.395e-08
d
yr
n .1883729358849537 1.2223e-09 deg/d
Q 3.170185789860113 1.3714e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3244  
   data-arc span      26309 days (72.03 yr)  
   first obs. used      1949-05-31  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40676  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 23:11:23  

Additional Information
 Earth MOID = 1.88504 au 
 Jupiter MOID = 2.0001 au 
 T_jup = 3.226 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457456.5 (2016-Mar-09.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05052128707211849 9.2303e-09  
q 2.8630571012918 2.6662e-08 au
tp 2457270.793299625014
(2015-Sep-05.29329963)
0.00013633 TDB
node 243.7796331339956 2.1449e-06 deg
peri 232.7176555846163 2.7879e-05 deg
i 9.389428243247762 7.6466e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3244  
   data-arc span      26309 days (72.03 yr)  
   first obs. used      1949-05-31  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40676  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 23:11:23  

Additional Information
 Jupiter MOID = 2.0001 au 
 T_jup = 3.226 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.519933431593953E-17 -2.207378165420248E-16 4.687771539170248E-13 -3.739681397502748E-15 1.00897296557756E-13 6.979761916591101E-16
q -2.207378165420248E-16 7.108578491922456E-16 -1.609589191807073E-12 1.200866354060115E-14 -3.447701745540525E-13 -2.192602278017502E-15
tp 4.687771539170248E-13 -1.609589191807073E-12 1.858506460105275E-8 -1.35158321511719E-11 3.789475195952946E-9 2.999097201599859E-12
node -3.739681397502748E-15 1.200866354060115E-14 -1.35158321511719E-11 4.600563062689477E-12 -7.129087031300639E-12 -8.486374591209443E-14
peri 1.00897296557756E-13 -3.447701745540525E-13 3.789475195952946E-9 -7.129087031300639E-12 7.77244139660628E-10 6.329189767021554E-13
i 6.979761916591101E-16 -2.192602278017502E-15 2.999097201599859E-12 -8.486374591209443E-14 6.329189767021554E-13 5.847111130350755E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.86   n/a MPCxxxxx  
diameter diameter 13.794 km 0.243 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.23 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:
[De Sanctis, M.C.; Barucci, M.A.; Angeli, C.A.; Fulchignoni, M.; et al. (1994) Planet. Space Sci. 42, 859-864.]
geometric albedo albedo 0.337   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4455 Ruriko (1988 XA)          Discovered 1988-Dec-02 by Ueda and Kaneda at Kushiro
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 XA = 1972 TL4 = 1972 VQ = 1982 UO5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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