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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 ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 212 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .703099827595778 4.5816e-08  
a .7387398711364657 1.9398e-09 au
q .2193319951022894 3.3794e-08 au
i 12.60558991271869 7.3093e-06 deg
node 180.4847416928985 7.7652e-06 deg
peri 172.3784640349047 9.1811e-06 deg
M 345.2046234088534 1.2554e-05 deg
tp 2459210.031456253754
(2020-Dec-26.53145625)
8.0992e-06 TDB
period 231.9186828542497
0.63
9.1346e-07
2.501e-09
d
yr
n 1.552268215606603 6.114e-09 deg/d
Q 1.258147747170642 3.3037e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.244354343903869E-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)      1263  
   data-arc span      18307 days (50.12 yr)  
   first obs. used      1971-03-26  
   last obs. used      2021-05-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46479  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-10 05:54:16  

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 2456406.5 (2013-Apr-24.0) TDB
Reference: JPL 212 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7030904678402284 4.5809e-08  
q .2193256811969218 3.3802e-08 au
tp 2456427.115984282346
(2013-May-14.61598428)
9.0621e-06 TDB
node 180.5198106148015 7.7723e-06 deg
peri 172.3469416388352 9.1882e-06 deg
i 12.60257118201292 7.3075e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.244354343903869E-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)      1263  
   data-arc span      18307 days (50.12 yr)  
   first obs. used      1971-03-26  
   last obs. used      2021-05-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46479  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-10 05:54:16  

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 2.098494441962321E-15 -1.548412163484162E-15 1.239173793460635E-14 -8.820235218251049E-14 1.202927617123963E-13 6.376746411702251E-14 4.288365090610342E-24
q -1.548412163484162E-15 1.142592529475485E-15 -1.018309752607729E-14 6.521032520291786E-14 -8.917082225969998E-14 -4.680630583983743E-14 -2.904645045470929E-24
tp 1.239173793460635E-14 -1.018309752607729E-14 8.21209014322776E-11 -1.891889553547898E-11 4.641098560713096E-11 9.60451436681719E-12 -8.987295585583472E-21
node -8.820235218251049E-14 6.521032520291786E-14 -1.891889553547898E-11 6.040937206344783E-11 -6.57564571688286E-11 -3.774915477317197E-12 1.301157738400855E-21
peri 1.202927617123963E-13 -8.917082225969998E-14 4.641098560713096E-11 -6.57564571688286E-11 8.442337191706906E-11 6.535984956823355E-12 -3.109744122707442E-21
i 6.376746411702251E-14 -4.680630583983743E-14 9.60451436681719E-12 -3.774915477317197E-12 6.535984956823355E-12 5.33996241033436E-11 2.957051196852199E-22
A2 4.288365090610342E-24 -2.904645045470929E-24 -8.987295585583472E-21 1.301157738400855E-21 -3.109744122707442E-21 2.957051196852199E-22 2.98960573058897E-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 18.11   n/a MPCxxxxx  
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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