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181905 (1999 SR1)
Classification: Main-belt Asteroid          SPK-ID: 2181905
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1910959053997033 3.9834e-08  
a 2.211095483762347 1.2853e-08 au
q 1.788564190367586 8.7276e-08 au
i 7.607972629936743 6.8009e-06 deg
node 43.84253304084701 3.5007e-05 deg
peri 264.304558483436 4.3201e-05 deg
M 269.2552310142348 3.1154e-05 deg
tp 2459699.211396597825
(2022-Apr-29.71139660)
0.00010587 TDB
period 1200.907820838814
3.29
1.0472e-05
2.867e-08
d
yr
n .2997732163560613 2.6139e-09 deg/d
Q 2.633626777157108 1.531e-08 au
  Orbit Determination Parameters
   # obs. used (total)      291  
   data-arc span      7900 days (21.63 yr)  
   first obs. used      1999-09-20  
   last obs. used      2021-05-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52542  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 02:38:46  

Additional Information
 Earth MOID = .793319 au 
 Jupiter MOID = 2.64453 au 
 T_jup = 3.622 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458065.5 (2017-Nov-08.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .191432932442517 3.9786e-08  
q 1.787669283622186 8.7217e-08 au
tp 2458497.651617659289
(2019-Jan-14.15161766)
9.8277e-05 TDB
node 43.86309281423863 3.4997e-05 deg
peri 264.2114434173452 4.3193e-05 deg
i 7.609780572407083 6.8024e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      291  
   data-arc span      7900 days (21.63 yr)  
   first obs. used      1999-09-20  
   last obs. used      2021-05-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52542  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 02:38:46  

Additional Information
 Jupiter MOID = 2.64453 au 
 T_jup = 3.622 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.58294044871297E-15 -3.445810853349783E-15 1.107774100059953E-12 1.102386043635636E-14 2.912174821231387E-13 4.894221313318652E-16
q -3.445810853349783E-15 7.606746129776411E-15 -1.741573049172378E-12 -1.813141626941457E-14 -4.706424171284844E-13 -5.792433283561677E-16
tp 1.107774100059953E-12 -1.741573049172378E-12 9.658431986604673E-9 9.180740604187374E-11 2.502961774732614E-9 -1.15267933494977E-13
node 1.102386043635636E-14 -1.813141626941457E-14 9.180740604187374E-11 1.224806980240444E-9 -1.188665295497853E-9 -7.510337964389315E-11
peri 2.912174821231387E-13 -4.706424171284844E-13 2.502961774732614E-9 -1.188665295497853E-9 1.865621892179261E-9 7.437621051500714E-11
i 4.894221313318652E-16 -5.792433283561677E-16 -1.15267933494977E-13 -7.510337964389315E-11 7.437621051500714E-11 4.627246877111646E-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 17.08   n/a MPCxxxxx  

181905 (1999 SR1)          Discovered 1999-Sep-20 by Sarounova, L. at Ondrejov
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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