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11891 (1991 FJ2)
Classification: Main-belt Asteroid          SPK-ID: 2011891
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09328648203022283 5.8749e-08  
a 2.24225800092502 1.3088e-08 AU
q 2.033085640214605 1.3037e-07 AU
i 2.980229661625225 6.2821e-06 deg
node 186.6813817984393 0.00010581 deg
peri 357.2010603231534 0.00011045 deg
M 13.41710683496433 3.2832e-05 deg
tp 2456954.792951541995
(2014-Oct-24.29295154)
0.00011178 JED
period 1226.384916456215
3.36
1.0738e-05
2.94e-08
d
yr
n .2935456846943801 2.5701e-09 deg/d
Q 2.451430361635436 1.4309e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      853  
   data-arc span      24001 days (65.71 yr)  
   first obs. used      1949-11-19  
   last obs. used      2015-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49874  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:34:15  

Additional Information
 Earth MOID = 1.03609 AU 
 T_jup = 3.626 
[ 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 14.6 mag n/a MPO250330  
rotation period rot_per 3.6085 h n/a LCDB (Rev. 2015-July); 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. (2015) Astron. J., in press.]

11891 (1991 FJ2)          Discovered 1991-Mar-20 by Debehogne, H. at La Silla
Reference: 19991026/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 FJ2 = 1999 RR257 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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