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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5154984010034415 7.367e-08  
a 2.234556795882599 3.9288e-09 AU
q 1.082646340653746 1.6295e-07 AU
i 6.378460205832736 9.9615e-06 deg
node 241.3463819639208 4.4421e-05 deg
peri 213.5541801184779 5.3449e-05 deg
M 3.864495289472451 1.2266e-05 deg
tp 2456787.402880056361
(2014-May-09.90288006)
4.1543e-05 JED
period 1220.07217670944
3.34
3.2177e-06
8.81e-09
d
yr
n .2950645108315867 7.7818e-10 deg/d
Q 3.386467251111453 5.9541e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      198  
   data-arc span      11050 days (30.25 yr)  
   first obs. used      1980-11-29  
   last obs. used      2011-03-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .66588  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 09:19:01  

Additional Information
 Earth MOID = .113306 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 (675)
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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