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42566 Ryutaro (1996 XQ25)
Classification: Main-belt Asteroid          SPK-ID: 2042566
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2404460036233737 3.3596e-08  
a 2.367784239152901 8.5876e-09 au
q 1.798459981406176 8.2365e-08 au
i 5.996968602012706 3.6637e-06 deg
node 127.865282104475 3.3278e-05 deg
peri 268.605094759024 3.4223e-05 deg
M 286.3102434676646 9.5894e-06 deg
tp 2459668.905728255233
(2022-Mar-30.40572826)
3.6443e-05 TDB
period 1330.796392696076
3.64
7.2399e-06
1.982e-08
d
yr
n .2705147098202392 1.4717e-09 deg/d
Q 2.937108496899627 1.0652e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1263  
   data-arc span      11076 days (30.32 yr)  
   first obs. used      1991-04-13  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 00:43:15  

Additional Information
 Earth MOID = .816923 au 
 Jupiter MOID = 2.51655 au 
 T_jup = 3.500 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457322.5 (2015-Oct-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2391155168185236 3.3369e-08  
q 1.802249853327971 8.1556e-08 au
tp 2457008.371487535688
(2014-Dec-16.87148754)
2.9368e-05 TDB
node 127.9315881066653 3.3241e-05 deg
peri 268.7155278328198 3.4214e-05 deg
i 5.998546608351914 3.6652e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1263  
   data-arc span      11076 days (30.32 yr)  
   first obs. used      1991-04-13  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 00:43:15  

Additional Information
 Jupiter MOID = 2.51655 au 
 T_jup = 3.500 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.113472532050572E-15 -2.713899112710458E-15 -4.788890633788846E-13 3.265128680437538E-15 -1.365381134097293E-13 -1.793505804547974E-15
q -2.713899112710458E-15 6.651338362646363E-15 1.195053218032409E-12 -7.373104171817901E-15 3.414746522372779E-13 4.480888844854746E-15
tp -4.788890633788846E-13 1.195053218032409E-12 8.624675264212395E-10 -3.698159444552989E-13 2.49492212559942E-10 1.79003823273057E-12
node 3.265128680437538E-15 -7.373104171817901E-15 -3.698159444552989E-13 1.104974677182611E-9 -1.098738072473816E-9 3.956022779248673E-11
peri -1.365381134097293E-13 3.414746522372779E-13 2.49492212559942E-10 -1.098738072473816E-9 1.170588241783848E-9 -3.883987667678432E-11
i -1.793505804547974E-15 4.480888844854746E-15 1.79003823273057E-12 3.956022779248673E-11 -3.883987667678432E-11 1.343398269619086E-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 15.10   n/a MPO636676  
diameter diameter 2.675 km 0.313 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.40892 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.325   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

42566 Ryutaro           Discovered 1996 Dec. 3 by T. Seki at Geisei.
Ryutaro Hirota (1892-1952), a renowned Japanese composer, was born in Aki city, Kochi prefecture and studied musical composition at Tokyo Music School. He composed many children's songs, which have been enjoyed by many generations of Japanese.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-01-12Last Updated: 2017-01-17

Alternate Designations
 1996 XQ25 = 2000 WZ168 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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