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18342 (1989 ST9)
Classification: Main-belt Asteroid          SPK-ID: 2018342
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358042429491595 3.2985e-08  
a 2.349820302680304 7.8131e-09 au
q 1.79572270514021 7.8319e-08 au
i 2.271994295356941 4.1851e-06 deg
node 19.29541813768942 9.4384e-05 deg
peri 315.7549108914774 9.4788e-05 deg
M 306.9751980738116 9.9076e-06 deg
tp 2459590.288034872397
(2022-Jan-10.78803487)
3.6651e-05 TDB
period 1315.680398979622
3.60
6.562e-06
1.797e-08
d
yr
n .2736226824380744 1.3647e-09 deg/d
Q 2.903917900220398 9.6555e-09 au
  Orbit Determination Parameters
   # obs. used (total)      835  
   data-arc span      11622 days (31.82 yr)  
   first obs. used      1989-09-04  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50101  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:35:49  

Additional Information
 Earth MOID = .78609 au 
 Jupiter MOID = 2.47847 au 
 T_jup = 3.519 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.93   n/a MPO614063  
diameter diameter 1.799 km 0.286 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.261   0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18342 (1989 ST9)          Discovered 1989-Sep-26 by Debehogne, H. at La Silla
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 ST9 = 1999 FM14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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