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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1960646237221287 5.6048e-08  
a 2.188581687316613 1.5466e-08 AU
q 1.75947824230774 1.2748e-07 AU
i 4.735661068504668 7.0539e-06 deg
node 32.44179341457112 6.7593e-05 deg
peri 280.1391336204765 6.9861e-05 deg
M 210.4117016071243 2.1046e-05 deg
tp 2457491.902871100873
(2016-Apr-13.40287110)
7.2025e-05 JED
period 1182.612781192914
3.24
1.2535e-05
3.432e-08
d
yr
n .3044107130627018 3.2267e-09 deg/d
Q 2.617685132325486 1.8498e-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 = .754209 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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