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JPL Small-Body Database Browser
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85953 (1999 FK21)
Classification: Aten [NEO]          SPK-ID: 2085953
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 189 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7030505487832631 6.1632e-08  
a .7387345694639287 2.0895e-09 au
q .219366824997146 4.5718e-08 au
i 12.60480768393184 8.8585e-06 deg
node 180.4883602439514 8.0064e-06 deg
peri 172.3771086145155 9.4742e-06 deg
M 133.839634215746 1.6676e-05 deg
tp 2458514.278951283197
(2019-Jan-30.77895128)
1.0605e-05 TDB
period 231.9161862622414
0.63
9.8394e-07
2.694e-09
d
yr
n 1.552284925869412 6.5858e-09 deg/d
Q 1.258102313930711 3.5585e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.26300219606145E-14 1.924E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      1168  
   data-arc span      17198 days (47.09 yr)  
   first obs. used      1971-03-26  
   last obs. used      2018-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47186  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-01 08:15:15  

Additional Information
 Earth MOID = .0707244 au 
 Jupiter MOID = 4.18219 au 
 T_jup = 7.567 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 18.1   n/a MPO296717  
diameter diameter 0.59 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
rotation period rot_per 68.44 h n/a LCDB (Rev. 2019-January); 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:
[Warner, B.D. (2018) Minor Planet Bull. 45, 366-379.]
geometric albedo albedo 0.32   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
SMASSII spectral type spec_B S   n/a Binzel et al. (2004) Icarus 170, 259-294  

85953 (1999 FK21)          Discovered 1999-Mar-24 by LINEAR at Socorro
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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