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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .123759383431827 1.7537e-08  
a 2.305828094330419 7.0843e-09 au
q 2.020460231076301 3.9809e-08 au
i 5.935900754797215 7.3079e-07 deg
node 80.41261357101367 6.429e-06 deg
peri 57.94401515711973 6.8285e-06 deg
M 170.5730265597637 5.2456e-06 deg
tp 2458790.536213035331
(2019-Nov-03.03621304)
1.8337e-05 TDB
period 1278.906563992102
3.50
5.8939e-06
1.614e-08
d
yr
n .2814904623495413 1.2973e-09 deg/d
Q 2.591195957584536 7.9611e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1966  
   data-arc span      15336 days (41.99 yr)  
   first obs. used      1979-08-14  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44723  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 23:50:56  

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 13.95   n/a MPO636525  
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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