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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1964342093577856 7.3806e-08  
a 2.576919516322067 2.8852e-08 AU
q 2.070724368554695 1.8825e-07 AU
i 14.02148069047132 8.5982e-06 deg
node 74.19642779945775 3.035e-05 deg
peri 199.4920834846323 3.7547e-05 deg
M 216.1644860186907 2.6378e-05 deg
tp 2457404.189104477730
(2016-Jan-16.68910448)
0.000115 JED
period 1510.948663486707
4.14
2.5375e-05
6.947e-08
d
yr
n .238260907666614 4.0014e-09 deg/d
Q 3.08311466408944 3.4519e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      843  
   data-arc span      8151 days (22.32 yr)  
   first obs. used      1991-09-05  
   last obs. used      2013-12-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51113  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:06:00  

Additional Information
 Earth MOID = 1.05932 AU 
 T_jup = 3.358 
[ 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 (413)
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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