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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 91 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6429457243690211 5.5806e-08  
a 1.57495192767134 4.4469e-09 AU
q .5623433196883043 8.9108e-08 AU
i 39.60663823465698 1.5931e-05 deg
node 66.59483032873455 8.5886e-06 deg
peri 241.8381802659894 1.1042e-05 deg
M 165.7031557163225 6.4752e-06 deg
tp 2456468.202052349525
(2013-Jun-24.70205235)
1.2577e-05 JED
period 721.9371329232154
1.98
3.0576e-06
8.371e-09
d
yr
n .4986583783858217 2.1119e-09 deg/d
Q 2.587560535654376 7.306e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      559  
   data-arc span      8034 days (22.00 yr)  
   first obs. used      1991-12-01  
   last obs. used      2013-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .68703  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Dec-19 23:24:30  

Additional Information
 Earth MOID = .193376 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Incomplete or inconclusive result.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1997) http://www.asu.cas.cz/~ppravec/neo.htm]
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 (413)
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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