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1009 Sirene (1923 PE)
Classification: Mars-crossing Asteroid          SPK-ID: 2001009
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4564763199093725 9.3773e-08  
a 2.622977895835966 4.6471e-09 au
q 1.425650598741135 2.4564e-07 au
i 15.77466662449703 1.341e-05 deg
node 229.4623934995807 3.0437e-05 deg
peri 186.3683282739658 3.1777e-05 deg
M 278.7037887567856 1.1191e-05 deg
tp 2457950.895224260527
(2017-Jul-16.39522426)
4.837e-05 JED
period 1551.637878380448
4.25
4.1236e-06
1.129e-08
d
yr
n .2320128974782164 6.1659e-10 deg/d
Q 3.820305192930797 6.7684e-09 au
  Orbit Determination Parameters
   # obs. used (total)      532  
   data-arc span      33473 days (91.64 yr)  
   first obs. used      1923-10-31  
   last obs. used      2015-06-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5859  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 17:43:44  

Additional Information
 Earth MOID = .436395 au 
 Jupiter MOID = 1.56808 au 
 T_jup = 3.200 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9 mag n/a MPO340699  

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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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