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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .456832996545099 9.5145e-08  
a 2.622102782665167 5.7685e-09 AU
q 1.424239711210996 2.4908e-07 AU
i 15.78053256961241 1.4079e-05 deg
node 229.4698751192961 4.0422e-05 deg
peri 186.3892640231754 4.231e-05 deg
M 139.4125862917437 1.1941e-05 deg
tp 2456399.917771286717
(2013-Apr-17.41777129)
5.1661e-05 JED
period 1550.861425698881
4.25
5.1177e-06
1.401e-08
d
yr
n .23212905681613 7.6601e-10 deg/d
Q 3.819965854119338 8.4037e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      455  
   data-arc span      33388 days (91.41 yr)  
   first obs. used      1923-10-31  
   last obs. used      2015-03-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58425  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:03:08  

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
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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