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9043 (1991 EJ4)
Classification: Main-belt Asteroid          SPK-ID: 2009043
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 .1269452941632671 4.5177e-08  
a 3.06457763488028 2.4144e-08 au
q 2.675543925534233 1.3404e-07 au
i 4.114542611637859 5.1122e-06 deg
node 313.7313544010605 6.0061e-05 deg
peri 326.109457073264 6.3375e-05 deg
M 152.318721792066 1.913e-05 deg
tp 2456771.403361376046
(2014-Apr-23.90336138)
0.00010509 JED
period 1959.541062273872
5.36
2.3158e-05
6.34e-08
d
yr
n .1837164869524358 2.1711e-09 deg/d
Q 3.453611344226327 2.721e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1550  
   data-arc span      22601 days (61.88 yr)  
   first obs. used      1954-04-02  
   last obs. used      2016-02-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50258  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:02:06  

Additional Information
 Earth MOID = 1.66014 au 
 Jupiter MOID = 1.68961 au 
 T_jup = 3.216 
[ 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 12.6 mag n/a MPO358718  
rotation period rot_per 6.0256 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.]

9043 (1991 EJ4)          Discovered 1991-Mar-12 by Debehogne, H. at La Silla
Reference: 19980808/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 EJ4 = 1982 QD1 = 1982 SX7 = 1986 GK = 1996 AK2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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