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8176 (1991 WA)
Classification: Apollo [NEO]          SPK-ID: 2008176
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 104 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6430099035793261 5.7513e-08  
a 1.574774151135386 4.585e-09 au
q .5621787760546064 9.1902e-08 au
i 39.59852866534316 1.3263e-05 deg
node 66.55425019720407 8.0055e-06 deg
peri 241.87099482 1.0533e-05 deg
M 204.7001265697814 9.9595e-06 deg
tp 2457911.882674241865
(2017-Jun-07.38267424)
2.0776e-05 JED
period 721.8149007535465
1.98
3.1524e-06
8.631e-09
d
yr
n .4987428212193654 2.1782e-09 deg/d
Q 2.587369526216166 7.5332e-09 au
  Orbit Determination Parameters
   # obs. used (total)      588  
   data-arc span      8783 days (24.05 yr)  
   first obs. used      1991-12-01  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .69028  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:06:35  

Additional Information
 Earth MOID = .192589 au 
 Jupiter MOID = 3.2173 au 
 T_jup = 3.953 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.9 mag n/a MPO263422  
rotation period rot_per 7.111 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Incomplete or inconclusive result.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1997) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D. (2015) Minor Planet Bul. 42, 256-266.]
SMASSII spectral type spec_B Q   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

8176 (1991 WA)          Discovered 1991-Nov-29 by McNaught, R. H. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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