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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6430703338103234 5.7924e-08  
a 1.574814646638584 4.6863e-09 AU
q .5620980661353232 9.2586e-08 AU
i 39.6001774620548 1.365e-05 deg
node 66.56658198539775 8.1455e-06 deg
peri 241.8655443167227 1.0746e-05 deg
M 265.4320519348846 9.3142e-06 deg
tp 2457190.119964045341
(2015-Jun-16.61996405)
1.9078e-05 JED
period 721.8427432656121
1.98
3.2221e-06
8.822e-09
d
yr
n .4987235839919402 2.2261e-09 deg/d
Q 2.587531227141844 7.6999e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      579  
   data-arc span      8542 days (23.39 yr)  
   first obs. used      1991-12-01  
   last obs. used      2015-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .66756  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:00:40  

Additional Information
 Earth MOID = .193236 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. 2015-July); 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, submitted (NEA gaggle)]
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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