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308635 (2005 YU55)
Classification: Apollo [NEO, PHA]          SPK-ID: 2308635
[ 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 129 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4305835405719646 1.6462e-09  
a 1.15707221047198 4.1265e-09 au
q .6588559613895252 2.5782e-09 au
i .3402401203407768 1.1612e-06 deg
node 35.9217844119912 4.0664e-05 deg
peri 273.5761684538976 4.0638e-05 deg
M 2.183501771183181 1.4718e-05 deg
tp 2458997.742660962500
(2020-May-28.24266096)		 1.8571e-05 TDB
period 454.6101434862745
1.24		 2.4319e-06
6.658e-09		 d
yr
n .7918873020282028 4.2362e-09 deg/d
Q 1.655288459554434 5.9033e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3993  
   # delay obs. used      9  
   # Doppler obs. used      10  
   data-arc span      4019 days (11.00 yr)  
   first obs. used      2005-12-24  
   last obs. used      2016-12-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .21899  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-21 06:16:09  

Additional Information
 Earth MOID = .000467117 au 
 Jupiter MOID = 3.61964 au 
 T_jup = 5.348 
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Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 21.9   n/a MPO254628  
magnitude slope G -0.12   n/a The Astronomer's Telegram, #3763  
diameter diameter 0.4 km n/a 2010 radar result http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html
rotation period rot_per 18 h n/a 2010 radar result http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html
SMASSII spectral type spec_B C   n/a M. Hicks et al., ATel 2571, 2010 also R. Binzel, personal communication

308635 (2005 YU55)          Discovered 2005-Dec-28 by Spacewatch at Kitt Peak
Reference: 20111210/Numbers.arcLast Updated: 2011-12-12

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