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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 192 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7030713458677447 6.1535e-08  
a .7387413912480462 2.2934e-09 au
q .2193534870550722 4.5668e-08 au
i 12.60497799973554 8.8256e-06 deg
node 180.486408416648 7.9717e-06 deg
peri 172.376948399522 9.4162e-06 deg
M 34.75199982565872 1.7742e-05 deg
tp 2458978.112047492462
(2020-May-08.61204749)
1.1378e-05 TDB
period 231.9193986863119
0.63
1.08e-06
2.957e-09
d
yr
n 1.552263424444829 7.2285e-09 deg/d
Q 1.25812929544102 3.9058e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.191805348617456E-14 1.921E-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)      1178  
   data-arc span      17840 days (48.84 yr)  
   first obs. used      1971-03-26  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4694  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-08 05:54:03  

Additional Information
 Earth MOID = .0706547 au 
 Jupiter MOID = 4.18577 au 
 T_jup = 7.567 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456061.5 (2012-May-14.0) TDB
Reference: JPL 192 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7031085110987725 6.1602e-08  
q .219321169547467 4.5587e-08 au
tp 2455963.303114384113
(2012-Feb-05.80311438)
1.0027e-05 TDB
node 180.5278304323122 7.9759e-06 deg
peri 172.3401026896306 9.4207e-06 deg
i 12.60201232759359 8.8247e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.191805348617456E-14 1.921E-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)      1178  
   data-arc span      17840 days (48.84 yr)  
   first obs. used      1971-03-26  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4694  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-08 05:54:03  

Additional Information
 Jupiter MOID = 4.18577 au 
 T_jup = 7.567 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 3.794822032610037E-15 -2.808180649585145E-15 -7.319210195865633E-14 -5.481083234169074E-14 7.315701562585209E-14 1.352823729964795E-13 -2.994035120399261E-23
q -2.808180649585145E-15 2.078147102880291E-15 5.337987698936034E-14 4.043187866101602E-14 -5.41189725006176E-14 -9.975837804515803E-14 2.246696768753468E-23
tp -7.319210195865633E-14 5.337987698936034E-14 1.005351516801666E-10 -1.949397759556241E-11 5.183284601028896E-11 1.54279217478055E-11 -7.944234309383025E-21
node -5.481083234169074E-14 4.043187866101602E-14 -1.949397759556241E-11 6.361548691967236E-11 -6.871837227826289E-11 3.362314659919063E-12 7.526650362204378E-22
peri 7.315701562585209E-14 -5.41189725006176E-14 5.183284601028896E-11 -6.871837227826289E-11 8.874943416199974E-11 3.224182273482637E-12 -2.201358466229193E-21
i 1.352823729964795E-13 -9.975837804515803E-14 1.54279217478055E-11 3.362314659919063E-12 3.224182273482637E-12 7.787450662959605E-11 -7.279527860924505E-22
A2 -2.994035120399261E-23 2.246696768753468E-23 -7.944234309383025E-21 7.526650362204378E-22 -2.201358466229193E-21 -7.279527860924505E-22 3.688632819965786E-30

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 28.08 h n/a LCDB (Rev. 2019-August); 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:
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Warner, B.D. (2018) Minor Planet Bull. 45, 366-379.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
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

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