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4688 (1980 WF)
Classification: Amor [NEO]          SPK-ID: 2004688
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5152349547294011 5.9002e-08  
a 2.23464863071694 4.1706e-09 au
q 1.083279544633379 1.3046e-07 au
i 6.376843118529577 9.4249e-06 deg
node 241.3390676597259 4.6153e-05 deg
peri 213.5646094643071 5.2977e-05 deg
M 180.9195000503007 1.1523e-05 deg
tp 2458007.457235270539
(2017-Sep-10.95723527)
4.0341e-05 JED
period 1220.147390468355
3.34
3.4158e-06
9.352e-09
d
yr
n .2950463221183579 8.2599e-10 deg/d
Q 3.3860177168005 6.3195e-09 au
  Orbit Determination Parameters
   # obs. used (total)      211  
   data-arc span      11110 days (30.42 yr)  
   first obs. used      1980-11-29  
   last obs. used      2011-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61294  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:01:50  

Additional Information
 Earth MOID = .114053 au 
 Jupiter MOID = 1.8622 au 
 T_jup = 3.445 
[ 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 19.4 mag n/a MPO226155  
diameter diameter 0.6 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
geometric albedo albedo 0.18   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV .930 mag .047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.35, mean=21.82, max.=22.29) deg.
U-B UB .463 mag .059 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.35, mean=21.82, max.=22.29) deg.
Tholen spectral type spec_T QU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B V   n/a Binzel et al. (2004) Icarus 170, 259-294  

4688 (1980 WF)          Discovered 1980-Nov-29 by Kowal, C. T. at Palomar
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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