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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 91 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2372975330255334 5.2178e-08  
a 1.010643886577268 2.8712e-09 au
q .7708205855251457 5.0947e-08 au
i 9.843390419772236 4.0267e-06 deg
node 138.1283950954677 4.1502e-06 deg
peri 74.10004566510143 6.7454e-06 deg
M 331.0997580280857 1.5769e-05 deg
tp 2459030.291655341245
(2020-Jun-29.79165534)
1.6378e-05 TDB
period 371.1040182040943
1.02
1.5814e-06
4.33e-09
d
yr
n .9700784209833387 4.1339e-09 deg/d
Q 1.250467187629391 3.5525e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53455  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-21 06:15:25  

Additional Information
 Earth MOID = .00386765 au 
 Jupiter MOID = 3.72686 au 
 T_jup = 5.992 
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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 20.1   n/a MPO268317  
rotation period rot_per 2.595 h n/a LCDB (Rev. 2019-August); 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

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