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249919 (2001 SL261)
Classification: Main-belt Asteroid          SPK-ID: 2249919
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110013635991822 4.8925e-08  
a 2.769274759827277 2.0539e-08 au
q 2.461881485305651 1.3479e-07 au
i 10.55369461095996 4.9008e-06 deg
node 209.5613392245633 2.8773e-05 deg
peri 101.9681650950291 3.7428e-05 deg
M 75.72588518438562 2.1606e-05 deg
tp 2458646.429816683958
(2019-Jun-11.92981668)
0.00010141 TDB
period 1683.2456389702
4.61
1.8727e-05
5.127e-08
d
yr
n .2138725279693854 2.3794e-09 deg/d
Q 3.076668034348903 2.2819e-08 au
  Orbit Determination Parameters
   # obs. used (total)      338  
   data-arc span      6995 days (19.15 yr)  
   first obs. used      2001-09-20  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55957  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 00:12:33  

Additional Information
 Earth MOID = 1.47535 au 
 Jupiter MOID = 2.20756 au 
 T_jup = 3.304 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457530.5 (2016-May-22.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1128335520205916 4.886e-08  
q 2.456059140501754 1.3502e-07 au
tp 2456964.992891928843
(2014-Nov-03.49289193)
0.00010361 TDB
node 209.5895040231617 2.8748e-05 deg
peri 102.3335494982181 3.7171e-05 deg
i 10.55914858739153 4.9064e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      338  
   data-arc span      6995 days (19.15 yr)  
   first obs. used      2001-09-20  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55957  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 00:12:33  

Additional Information
 Jupiter MOID = 2.20756 au 
 T_jup = 3.304 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.387284421543597E-15 -6.5367005010768E-15 9.752572701106758E-13 4.94804016386283E-16 2.126388885803683E-13 -8.048170998591616E-15
q -6.5367005010768E-15 1.823021622914744E-14 -3.282819988415697E-12 -3.151338837623479E-17 -7.00017474237669E-13 2.258332289344391E-14
tp 9.752572701106758E-13 -3.282819988415697E-12 1.073582814655233E-8 -1.901810832365014E-11 2.472527709527858E-9 -4.470596247213846E-12
node 4.94804016386283E-16 -3.151338837623479E-17 -1.901810832365014E-11 8.264720221221805E-10 -8.164398800102535E-10 -4.052436530671639E-11
peri 2.126388885803683E-13 -7.00017474237669E-13 2.472527709527858E-9 -8.164398800102535E-10 1.381705889130407E-9 3.894635782137303E-11
i -8.048170998591616E-15 2.258332289344391E-14 -4.470596247213846E-12 -4.052436530671639E-11 3.894635782137303E-11 2.407294173300886E-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 16.1   n/a MPO440261  

249919 (2001 SL261)          Discovered 2001-Sep-20 by LINEAR at Socorro
Reference: 20100923/Numbers.arcLast Updated: 2010-09-27
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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