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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 119 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4306339755147235 1.6253e-09  
a 1.157318608787396 5.2125e-09 AU
q .6589378953481104 2.5661e-09 AU
i .3405609655653917 6.0297e-07 deg
node 35.8832421439479 2.0237e-05 deg
peri 273.620403061615 2.0073e-05 deg
M 60.29348437874583 5.427e-06 deg
tp 2456724.336706966711
(2014-Mar-07.83670697)
6.3409e-06 JED
period 454.7553649370662
1.25
3.0723e-06
8.411e-09
d
yr
n .791634420959103 5.3483e-09 deg/d
Q 1.655699322226681 7.4572e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      3487  
   # 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      .46369  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 09:40:43  

Additional Information
 Earth MOID = .000480444 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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