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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2398256874479961 3.8997e-08  
a 2.615937784650853 1.2687e-08 au
q 1.988568707125774 1.0489e-07 au
i 12.35653434064111 3.9532e-06 deg
node 231.4786672670101 2.0755e-05 deg
peri 142.1383235791215 2.2517e-05 deg
M 13.69546608228324 1.1945e-05 deg
tp 2459337.708592293802
(2021-May-03.20859229)
5.0989e-05 TDB
period 1545.395143697273
4.23
1.1243e-05
3.078e-08
d
yr
n .2329501302422368 1.6947e-09 deg/d
Q 3.243306862175932 1.573e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2038  
   data-arc span      12301 days (33.68 yr)  
   first obs. used      1987-11-21  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43226  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:39:59  

Additional Information
 Earth MOID = 1.00534 au 
 Jupiter MOID = 2.28703 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456977.5 (2014-Nov-16.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .241179005346829 3.8762e-08  
q 1.984155194211677 1.0425e-07 au
tp 2456250.030437625472
(2012-Nov-18.53043763)
3.997e-05 TDB
node 231.5448255537179 2.073e-05 deg
peri 142.498406317543 2.2484e-05 deg
i 12.36806257003584 3.9566e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2038  
   data-arc span      12301 days (33.68 yr)  
   first obs. used      1987-11-21  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43226  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:39:59  

Additional Information
 Jupiter MOID = 2.28703 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.502456417554688E-15 -4.024860056081249E-15 -4.575623262889219E-13 4.56118405721181E-15 -1.014152360401011E-13 -1.058943176769975E-15
q -4.024860056081249E-15 1.08670286346672E-14 1.297937018958219E-12 -1.356111147991729E-14 2.959404838087457E-13 3.505362150333114E-15
tp -4.575623262889219E-13 1.297937018958219E-12 1.597595962639571E-9 -4.537877444638575E-12 3.705146646160799E-10 1.828996821033404E-12
node 4.56118405721181E-15 -1.356111147991729E-14 -4.537877444638575E-12 4.297383907215241E-10 -4.207446177569224E-10 -6.514375506362672E-12
peri -1.014152360401011E-13 2.959404838087457E-13 3.705146646160799E-10 -4.207446177569224E-10 5.055176870119057E-10 6.900053401683259E-12
i -1.058943176769975E-15 3.505362150333114E-15 1.828996821033404E-12 -6.514375506362672E-12 6.900053401683259E-12 1.565498955979476E-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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