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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 211 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7030998274682541 4.5819e-08  
a .7387398711350183 1.9399e-09 au
q .2193319951960667 3.3796e-08 au
i 12.60558990718864 7.3093e-06 deg
node 180.4847416473399 7.7665e-06 deg
peri 172.3784640679088 9.1828e-06 deg
M 345.2046234444156 1.2554e-05 deg
tp 2459210.031456230816
(2020-Dec-26.53145623)
8.0993e-06 TDB
period 231.9186828535682
0.63
9.1353e-07
2.501e-09
d
yr
n 1.552268215611165 6.1144e-09 deg/d
Q 1.25814774707397 3.3039e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.244185663018104E-14 1.729E-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)      1260  
   data-arc span      18277 days (50.04 yr)  
   first obs. used      1971-03-26  
   last obs. used      2021-04-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .465  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-18 06:26:02  

Additional Information
 Earth MOID = .0705137 au 
 Jupiter MOID = 4.18656 au 
 T_jup = 7.567 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456398.5 (2013-Apr-16.0) TDB
Reference: JPL 211 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7030913023972838 4.5812e-08  
q .2193258914319792 3.3804e-08 au
tp 2456427.115955447221
(2013-May-14.61595545)
9.0629e-06 TDB
node 180.5199526498866 7.7735e-06 deg
peri 172.3466699208779 9.1898e-06 deg
i 12.60260020058912 7.3075e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.244185663018104E-14 1.729E-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)      1260  
   data-arc span      18277 days (50.04 yr)  
   first obs. used      1971-03-26  
   last obs. used      2021-04-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .465  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-18 06:26:02  

Additional Information
 Jupiter MOID = 4.18656 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 2.098752135822105E-15 -1.548604972935738E-15 1.245045279450046E-14 -8.822684739176221E-14 1.203496921328716E-13 6.377007046894287E-14 4.280849476168408E-24
q -1.548604972935738E-15 1.142736483794654E-15 -1.022010319406585E-14 6.522757755412823E-14 -8.921041793999861E-14 -4.680847217889336E-14 -2.900580183816163E-24
tp 1.245045279450046E-14 -1.022010319406585E-14 8.21365055067217E-11 -1.892902985906494E-11 4.642697763864261E-11 9.605013128985279E-12 -8.989484009071384E-21
node -8.822684739176221E-14 6.522757755412823E-14 -1.892902985906494E-11 6.042713025898084E-11 -6.577792218297197E-11 -3.773884488772972E-12 1.302742362663867E-21
peri 1.203496921328716E-13 -8.921041793999861E-14 4.642697763864261E-11 -6.577792218297197E-11 8.445163343115724E-11 6.535305278461559E-12 -3.111924836473092E-21
i 6.377007046894287E-14 -4.680847217889336E-14 9.605013128985279E-12 -3.773884488772972E-12 6.535305278461559E-12 5.340008035435972E-11 2.956619449681719E-22
A2 4.280849476168408E-24 -2.900580183816163E-24 -8.989484009071384E-21 1.302742362663867E-21 -3.111924836473092E-21 2.956619449681719E-22 2.989911412267803E-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. 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:
[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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