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JPL Small-Body Database Browser
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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2404771939385028 4.1255e-08  
a 2.617100306001035 1.3392e-08 au
q 1.987747368158309 1.0997e-07 au
i 12.36017030349704 4.1774e-06 deg
node 231.5278739805397 2.2078e-05 deg
peri 142.109797751826 2.3691e-05 deg
M 281.5108693663572 1.1796e-05 deg
tp 2459337.659962760206
(2021-May-03.15996276)
5.2413e-05 TDB
period 1546.425417300364
4.23
1.187e-05
3.25e-08
d
yr
n .2327949320882616 1.7869e-09 deg/d
Q 3.246453243843761 1.6613e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1715  
   data-arc span      11550 days (31.62 yr)  
   first obs. used      1987-11-21  
   last obs. used      2019-07-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46151  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:05:15  

Additional Information
 Earth MOID = 1.00529 au 
 Jupiter MOID = 2.28206 au 
 T_jup = 3.333 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.8   n/a MPO337309  
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. 2019-August); 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]
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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