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1009 Sirene (A923 UE)
Classification: Mars-crossing Asteroid          SPK-ID: 2001009
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4535679414237072 5.717e-08  
a 2.628797377033669 4.0343e-09 au
q 1.436459162312467 1.4953e-07 au
i 15.73128351829863 7.6331e-06 deg
node 229.4176047194557 1.867e-05 deg
peri 186.4364835766492 1.9574e-05 deg
M 243.2194762077634 8.7152e-06 deg
tp 2459505.512367717749
(2021-Oct-18.01236772)
3.8272e-05 TDB
period 1556.804563591755
4.26
3.5837e-06
9.812e-09
d
yr
n .2312428987036319 5.3232e-10 deg/d
Q 3.821135591754871 5.8641e-09 au
  Orbit Determination Parameters
   # obs. used (total)      919  
   data-arc span      35293 days (96.63 yr)  
   first obs. used      1923-10-31  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52097  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:24:49  

Additional Information
 Earth MOID = .44883 au 
 Jupiter MOID = 1.56637 au 
 T_jup = 3.199 
[ show covariance matrix ]

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 13.9   n/a MPO340699  

1009 Sirene (A923 UE)          Discovered 1923-Oct-31 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A923 UE = 2019 FK8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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