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277475 (2005 WK4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2277475
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 92 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2373339163539079 5.2171e-08  
a 1.01061821803818 2.8428e-09 au
q .7707642384125711 5.0959e-08 au
i 9.843575924445386 4.0267e-06 deg
node 138.1283386148595 4.1502e-06 deg
peri 74.09638986725002 6.7456e-06 deg
M 165.1205560353338 1.6565e-05 deg
tp 2459030.292868436676
(2020-Jun-29.79286844)
1.638e-05 TDB
period 371.0898802308089
1.02
1.5658e-06
4.287e-09
d
yr
n .9701153795303948 4.0933e-09 deg/d
Q 1.250472197663789 3.5175e-09 au
  Orbit Determination Parameters
   # obs. used (total)      325  
   # delay obs. used      9  
   # Doppler obs. used      3  
   data-arc span      3182 days (8.71 yr)  
   first obs. used      2005-11-27  
   last obs. used      2014-08-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53459  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 04:01:03  

Additional Information
 Earth MOID = .00277617 au 
 Jupiter MOID = 3.72573 au 
 T_jup = 5.992 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.0   n/a MPO527904  
rotation period rot_per 2.595 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Benner, L.A.M. et al. (2013) http://www.jpl.nasa.gov/news/news.php?release=2013-254]
[Stephens, R.D. (2014) Minor Planet Bull. 41, 13-15.]

277475 (2005 WK4)          Discovered 2005-Nov-27 by Siding Spring Survey at Siding Spring
Reference: 20110517/Numbers.arcLast Updated: 2011-05-20

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