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18357 (1990 SR2)
Classification: Main-belt Asteroid          SPK-ID: 2018357
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1958137911153343 5.5901e-08  
a 2.189007646552286 1.5182e-08 AU
q 1.760369760500427 1.2698e-07 AU
i 4.734904317050238 7.0517e-06 deg
node 32.50421403969436 6.7604e-05 deg
peri 279.9440401550058 6.9885e-05 deg
M 149.7316917410191 2.0742e-05 deg
tp 2456308.482471029567
(2013-Jan-15.98247103)
6.5651e-05 JED
period 1182.958052298769
3.24
1.2307e-05
3.369e-08
d
yr
n .3043218644147477 3.166e-09 deg/d
Q 2.617645532604145 1.8155e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      830  
   data-arc span      13320 days (36.47 yr)  
   first obs. used      1977-09-08  
   last obs. used      2014-02-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51575  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:05:40  

Additional Information
 Earth MOID = .753207 AU 
 T_jup = 3.645 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6 mag n/a MPO234934  

18357 (1990 SR2)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar (675)
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SR2 = 1977 RA2 = 1990 SX28 = 1999 FX30 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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