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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1237593833522233 1.7538e-08  
a 2.305828094814505 7.2111e-09 au
q 2.02046023168403 3.9828e-08 au
i 5.935900796311786 7.3376e-07 deg
node 80.41261335281942 6.4377e-06 deg
peri 57.94401499469923 6.8459e-06 deg
M 170.5730267152252 5.25e-06 deg
tp 2458790.536212292227
(2019-Nov-03.03621229)
1.8375e-05 TDB
period 1278.906564394843
3.50
5.9993e-06
1.643e-08
d
yr
n .281490462260897 1.3205e-09 deg/d
Q 2.59119595794498 8.1035e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1885  
   data-arc span      15288 days (41.86 yr)  
   first obs. used      1979-08-14  
   last obs. used      2021-06-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45193  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 06:53:00  

Additional Information
 Earth MOID = 1.04212 au 
 Jupiter MOID = 2.44104 au 
 T_jup = 3.571 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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

Alternate Designations
 1999 FF9 = 1979 PJ = 1992 FB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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