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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1241741801409272 1.7571e-08  
a 2.304539169195567 7.2277e-09 au
q 2.018374907258054 3.9914e-08 au
i 5.938902947240644 7.3509e-07 deg
node 80.43178213043829 6.4364e-06 deg
peri 57.690484705618 6.8347e-06 deg
M 115.6393549613906 5.1864e-06 deg
tp 2458790.033491066651
(2019-Nov-02.53349107)
1.8262e-05 TDB
period 1277.834377970562
3.50
6.0115e-06
1.646e-08
d
yr
n .2817266511265308 1.3254e-09 deg/d
Q 2.59070343113308 8.1251e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1829  
   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      .45578  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 05:09:35  

Additional Information
 Earth MOID = 1.03933 au 
 Jupiter MOID = 2.4426 au 
 T_jup = 3.571 
[ 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 13.93   n/a E2021B10  
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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