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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4569585146449078 9.5577e-08  
a 2.621979638788045 5.8179e-09 AU
q 1.423843717618268 2.5026e-07 AU
i 15.78163897369916 1.4225e-05 deg
node 229.4685218423773 3.8014e-05 deg
peri 186.3895969101031 4.0843e-05 deg
M 92.97357072896412 1.185e-05 deg
tp 2456400.002869246503
(2013-Apr-17.50286925)
5.1385e-05 JED
period 1550.752175492629
4.25
5.1615e-06
1.413e-08
d
yr
n .2321454102655947 7.7266e-10 deg/d
Q 3.820115559957822 8.4765e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      431  
   data-arc span      33030 days (90.43 yr)  
   first obs. used      1923-10-31  
   last obs. used      2014-04-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .68053  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 13:37:09  

Additional Information
 Earth MOID = .435075 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 13.8 mag n/a MPO265961  

1009 Sirene (1923 PE)          Discovered 1923-Oct-31 by Reinmuth, K. at Heidelberg (024)
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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