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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .196369478530968 5.5603e-08  
a 2.187784959450576 1.3894e-08 au
q 1.758170767825371 1.2657e-07 au
i 4.73686627022456 6.5193e-06 deg
node 32.42795165462415 6.1319e-05 deg
peri 280.2573972916764 6.3529e-05 deg
M 332.1241659161992 2.1694e-05 deg
tp 2457492.023105005487
(2016-Apr-13.52310501)
7.1781e-05 JED
period 1181.967065197958
3.24
1.1259e-05
3.083e-08
d
yr
n .3045770145378006 2.9014e-09 deg/d
Q 2.61739915107578 1.6622e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1005  
   data-arc span      13822 days (37.84 yr)  
   first obs. used      1977-09-08  
   last obs. used      2015-07-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5123  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:50:06  

Additional Information
 Earth MOID = .750092 au 
 Jupiter MOID = 2.65708 au 
 T_jup = 3.646 
[ 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 14.7 mag n/a MPO319314  

18357 (1990 SR2)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar
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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