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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4568329931669886 9.5508e-08  
a 2.622102784205435 6.0652e-09 AU
q 1.424239720905372 2.5002e-07 AU
i 15.78053276949834 1.4174e-05 deg
node 229.4698703102375 4.2752e-05 deg
peri 186.3892643009793 4.4826e-05 deg
M 139.4125877213656 1.2181e-05 deg
tp 2456399.917764598791
(2013-Apr-17.41776460)
5.2805e-05 JED
period 1550.861427065385
4.25
5.3809e-06
1.473e-08
d
yr
n .2321290566115952 8.054e-10 deg/d
Q 3.819965847505498 8.8359e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      432  
   data-arc span      33086 days (90.58 yr)  
   first obs. used      1923-10-31  
   last obs. used      2014-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .59757  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:15:09  

Additional Information
 Earth MOID = .436214 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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