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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455688.5 (2011-May-07.0) TDB
Reference: JPL 129 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4289728376187354 1.6062e-09  
q .6525298003202852 1.4973e-09 au
tp 2455814.317148248732
(2011-Sep-09.81714825)
9.6612e-08 TDB
node 39.31317317917468 1.6829e-05 deg
peri 268.7769993254818 1.6831e-05 deg
i .5134934632269681 1.1653e-06 deg
  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
 Jupiter MOID = 3.61964 au 
 T_jup = 5.348 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.579799404136263E-18 -2.396589482742609E-18 1.063155117575826E-16 -3.983098008497407E-15 3.885549341892873E-15 1.412975493890298E-16
q -2.396589482742609E-18 2.241790206207159E-18 -9.211542047560956E-17 4.832939808138041E-15 -4.749052014004139E-15 -1.222647156620568E-16
tp 1.063155117575826E-16 -9.211542047560956E-17 9.333831354591949E-15 3.628809370755166E-13 -3.687210291463408E-13 9.010251759244426E-15
node -3.983098008497407E-15 4.832939808138041E-15 3.628809370755166E-13 2.832308374181696E-10 -2.832546099238782E-10 1.54526443903351E-11
peri 3.885549341892873E-15 -4.749052014004139E-15 -3.687210291463408E-13 -2.832546099238782E-10 2.832875229343906E-10 -1.542952000231183E-11
i 1.412975493890298E-16 -1.222647156620568E-16 9.010251759244426E-15 1.54526443903351E-11 -1.542952000231183E-11 1.358030462345701E-12

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 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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