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308635 (2005 YU55)
Classification: Apollo [NEO, PHA]          SPK-ID: 2308635
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4306339821171206 2.2945e-09  
a 1.157318665653808 1.4999e-08 AU
q .6589379200848362 6.7469e-09 AU
i .3405593683535689 7.8394e-07 deg
node 35.88324709885827 2.9985e-05 deg
peri 273.6204037231839 2.9458e-05 deg
M 60.29342531468189 1.5589e-05 deg
tp 2456724.336775963415
(2014-Mar-07.83677596)
1.8212e-05 JED
period 454.7553984545948
1.25
8.8408e-06
2.42e-08
d
yr
n .7916343626120677 1.539e-08 deg/d
Q 1.65569941122278 2.1459e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      3662  
   # delay obs. used      9  
   # Doppler obs. used      10  
   data-arc span      2183 days (5.98 yr)  
   first obs. used      2005-12-24  
   last obs. used      2011-12-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .31783  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-12 13:31:54  

Additional Information
 Earth MOID = .000480441 AU 
 T_jup = 5.347 
[ 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 21.9 mag 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 type   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 (691)
Reference: 20111210/Numbers.arcLast Updated: 2011-12-12

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