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9557 (1986 QL2)
Classification: Main-belt Asteroid          SPK-ID: 2009557
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1555165643053723 4.0749e-08  
a 3.159047434420741 2.5239e-08 au
q 2.667763230941927 1.2398e-07 au
i 3.549668360746611 5.945e-06 deg
node 344.9244998597304 7.1213e-05 deg
peri 275.3363033915878 7.3726e-05 deg
M 168.6303523357286 1.977e-05 deg
tp 2456639.848436040010
(2013-Dec-13.34843604)
0.00011123 JED
period 2050.844099151671
5.61
2.4578e-05
6.729e-08
d
yr
n .1755374775434727 2.1037e-09 deg/d
Q 3.650331637899555 2.9165e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1429  
   data-arc span      10764 days (29.47 yr)  
   first obs. used      1986-08-28  
   last obs. used      2016-02-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49123  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:35:10  

Additional Information
 Earth MOID = 1.65534 au 
 Jupiter MOID = 1.44775 au 
 T_jup = 3.184 
[ 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 12.7 mag n/a MPO347601  
rotation period rot_per 53.6527 h n/a LCDB (Rev. 2016-February); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

9557 (1986 QL2)          Discovered 1986-Aug-28 by Debehogne, H. at La Silla
Reference: 19981110/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1986 QL2 = 1996 GW1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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