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6514 Torahiko (1987 WY)
Classification: Main-belt Asteroid          SPK-ID: 2006514
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2398256871551606 3.9146e-08  
a 2.615937784765859 1.2773e-08 au
q 1.988568707979239 1.0537e-07 au
i 12.35653433857228 3.9533e-06 deg
node 231.4786666707595 2.0785e-05 deg
peri 142.1383242213084 2.2558e-05 deg
M 13.69546597001972 1.2043e-05 deg
tp 2459337.708592771846
(2021-May-03.20859277)
5.1409e-05 TDB
period 1545.395143799185
4.23
1.1318e-05
3.099e-08
d
yr
n .2329501302268748 1.7061e-09 deg/d
Q 3.24330686155248 1.5836e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2016  
   data-arc span      12083 days (33.08 yr)  
   first obs. used      1987-11-21  
   last obs. used      2020-12-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43397  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:50:02  

Additional Information
 Earth MOID = 1.00534 au 
 Jupiter MOID = 2.28703 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456968.5 (2014-Nov-07.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .241171341813278 3.8908e-08  
q 1.984189623981346 1.0472e-07 au
tp 2456250.033374771360
(2012-Nov-18.53337477)
4.0169e-05 TDB
node 231.5451066764407 2.076e-05 deg
peri 142.4998295629309 2.2525e-05 deg
i 12.36800167138062 3.9567e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2016  
   data-arc span      12083 days (33.08 yr)  
   first obs. used      1987-11-21  
   last obs. used      2020-12-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43397  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:50:02  

Additional Information
 Jupiter MOID = 2.28703 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.51379582621836E-15 -4.058286553390595E-15 -4.708301621942818E-13 4.611344905949944E-15 -1.043106736418133E-13 -1.088851690329732E-15
q -4.058286553390595E-15 1.096552847121713E-14 1.336930669068992E-12 -1.369022004089599E-14 3.044202501334769E-13 3.590222078581627E-15
tp -4.708301621942818E-13 1.336930669068992E-12 1.613557443988508E-9 -4.435351623725074E-12 3.738354177315873E-10 1.871651687989371E-12
node 4.611344905949944E-15 -1.369022004089599E-14 -4.435351623725074E-12 4.309857622259541E-10 -4.219417158339148E-10 -6.502276459119586E-12
peri -1.043106736418133E-13 3.044202501334769E-13 3.738354177315873E-10 -4.219417158339148E-10 5.073961647937697E-10 6.896936837595448E-12
i -1.088851690329732E-15 3.590222078581627E-15 1.871651687989371E-12 -6.502276459119586E-12 6.896936837595448E-12 1.565510451084086E-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 12.82   n/a E2021B10  
diameter diameter 7.555 km 0.201 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.7207 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2016) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.282   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6514 Torahiko (1987 WY)          Discovered 1987-Nov-25 by Seki, T. at Geisei
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 WY = 1991 VB4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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