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18377 (1991 SH1)
Classification: Main-belt Asteroid          SPK-ID: 2018377
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1966602441870211 6.5651e-08  
a 2.574905358461685 2.0885e-08 au
q 2.06852384190814 1.7406e-07 au
i 14.01378791779556 6.7459e-06 deg
node 74.11982309006011 2.982e-05 deg
peri 199.9159681512075 3.6953e-05 deg
M 46.57782183615905 2.652e-05 deg
tp 2457405.238326118625
(2016-Jan-17.73832612)
0.00011024 JED
period 1509.177540430293
4.13
1.8362e-05
5.027e-08
d
yr
n .2385405231364347 2.9023e-09 deg/d
Q 3.081286875015229 2.4993e-08 au
  Orbit Determination Parameters
   # obs. used (total)      959  
   data-arc span      8717 days (23.87 yr)  
   first obs. used      1991-09-05  
   last obs. used      2015-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51547  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:50:10  

Additional Information
 Earth MOID = 1.05746 au 
 Jupiter MOID = 2.03151 au 
 T_jup = 3.359 
[ 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 13.4 mag n/a MPO253492  
diameter diameter 12.62 km 1.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
geometric albedo albedo 0.0442   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3

18377 (1991 SH1)          Discovered 1991-Sep-28 by McNaught, R. H. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 SH1 = 1999 LY25 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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