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101861 (1999 LA4)
Classification: Inner Main-belt Asteroid          SPK-ID: 2101861
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03263885984787693 5.2016e-08  
a 1.94063439284453 8.381e-09 au
q 1.877294298880508 1.0219e-07 au
i 20.95502203259934 5.8404e-06 deg
node 244.4646787563584 1.3077e-05 deg
peri 353.0611962173659 8.0678e-05 deg
M 6.151391169727623 8.2477e-05 deg
tp 2459183.627289429648
(2020-Nov-30.12728943)
0.00022619 TDB
period 987.4474956525374
2.70
6.3968e-06
1.751e-08
d
yr
n .3645763461702845 2.3617e-09 deg/d
Q 2.003974486808553 8.6546e-09 au
  Orbit Determination Parameters
   # obs. used (total)      549  
   data-arc span      8100 days (22.18 yr)  
   first obs. used      1997-12-22  
   last obs. used      2020-02-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51257  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:58:07  

Additional Information
 Earth MOID = .863217 au 
 Jupiter MOID = 3.01599 au 
 T_jup = 3.821 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457063.5 (2015-Feb-10.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0326643858974748 5.2e-08  
q 1.87736474903908 1.0217e-07 au
tp 2457207.782688286408
(2015-Jul-04.28268829)
0.00022234 TDB
node 244.4836075992905 1.3079e-05 deg
peri 352.7858472483503 8.063e-05 deg
i 20.9518409324789 5.8397e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      549  
   data-arc span      8100 days (22.18 yr)  
   first obs. used      1997-12-22  
   last obs. used      2020-02-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51257  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:58:07  

Additional Information
 Jupiter MOID = 3.01599 au 
 T_jup = 3.821 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.703964720398604E-15 -5.296242891090286E-15 -2.623057855244837E-13 8.259773271751657E-15 -3.111399167429909E-14 -1.104780544322062E-14
q -5.296242891090286E-15 1.043920021396698E-14 9.893524141349687E-13 -1.747613936826646E-14 2.268996310259904E-13 2.276392693740951E-14
tp -2.623057855244837E-13 9.893524141349687E-13 4.943571703753012E-8 -2.147132935223383E-11 1.770214961579648E-8 3.995792106238643E-11
node 8.259773271751657E-15 -1.747613936826646E-14 -2.147132935223383E-11 1.710646217264514E-10 -1.659668527121646E-10 1.064325873795167E-11
peri -3.111399167429909E-14 2.268996310259904E-13 1.770214961579648E-8 -1.659668527121646E-10 6.501151444829957E-9 4.311110709271265E-12
i -1.104780544322062E-14 2.276392693740951E-14 3.995792106238643E-11 1.064325873795167E-11 4.311110709271265E-12 3.410166406775077E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.13   n/a E2021B55  

101861 (1999 LA4)          Discovered 1999-Jun-09 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

Alternate Designations
 1999 LA4 = 2004 FF16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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