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JPL Small-Body Database Browser
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6987 Onioshidashi (1994 WZ)
Classification: Main-belt Asteroid          SPK-ID: 2006987
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04559215006337168 3.9011e-08  
a 2.789695409473088 1.2307e-08 au
q 2.662507197733292 1.1027e-07 au
i 2.969206442620801 3.9129e-06 deg
node 264.3811236324052 8.3369e-05 deg
peri 326.8545054483603 9.3709e-05 deg
M 9.254071049827951 4.3138e-05 deg
tp 2458956.751422401067
(2020-Apr-17.25142240)
0.00020394 TDB
period 1701.898315975076
4.66
1.1262e-05
3.083e-08
d
yr
n .2115285012158577 1.3998e-09 deg/d
Q 2.916883621212884 1.2868e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1829  
   data-arc span      10692 days (29.27 yr)  
   first obs. used      1991-01-19  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49381  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:41:11  

Additional Information
 Earth MOID = 1.65193 au 
 Jupiter MOID = 2.07146 au 
 T_jup = 3.326 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.6   n/a MPO384818  
diameter diameter 5.723 km 0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 35.6657 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.135   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6987 Onioshidashi           Discovered 1994 Nov. 25 by T. Kobayashi at Oizumi.
Onioshidashi is a lava plateau formed by the lava flow of the 1783 eruption of Mt. Asamayama. The gigantic, dark lava spread, 3 km by 12 km and 30 m thick, makes a chilling and unearthly scene.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1994 WZ = 1991 CT = 1993 PO6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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