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31564 (1999 FF9)
Classification: Main-belt Asteroid          SPK-ID: 2031564
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1243021810039809 3.9529e-08  
a 2.304127309409503 7.5298e-09 au
q 2.017719259539068 8.9455e-08 au
i 5.939361527294221 3.3495e-06 deg
node 80.43122270472047 4.9688e-05 deg
peri 57.60581475089086 5.3587e-05 deg
M 59.36038317232742 1.9596e-05 deg
tp 2458789.854430606684
(2019-Nov-02.35443061)
6.9396e-05 TDB
period 1277.491837635999
3.50
6.2622e-06
1.714e-08
d
yr
n .2818021919155121 1.3814e-09 deg/d
Q 2.590535359279939 8.4658e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1803  
   data-arc span      14975 days (41.00 yr)  
   first obs. used      1979-08-14  
   last obs. used      2020-08-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46011  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:00:21  

Additional Information
 Earth MOID = 1.03877 au 
 Jupiter MOID = 2.44374 au 
 T_jup = 3.572 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO452614  
rotation period rot_per 13.4457 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

31564 (1999 FF9)          Discovered 1999-Mar-20 by LONEOS at Anderson Mesa
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 FF9 = 1979 PJ = 1992 FB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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