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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1964803883365424 6.9139e-08  
a 2.575463908089518 2.5253e-08 AU
q 2.06943575928134 1.7985e-07 AU
i 14.01377393483983 7.7535e-06 deg
node 74.14138302560458 3.0108e-05 deg
peri 199.7548656988913 3.7246e-05 deg
M 263.571393264536 2.6483e-05 deg
tp 2457404.875672417032
(2016-Jan-17.37567242)
0.00011355 JED
period 1509.668624265136
4.13
2.2204e-05
6.079e-08
d
yr
n .2384629277005991 3.5073e-09 deg/d
Q 3.081492056897696 3.0215e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      878  
   data-arc span      8559 days (23.43 yr)  
   first obs. used      1991-09-05  
   last obs. used      2015-02-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5189  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:53:48  

Additional Information
 Earth MOID = 1.05995 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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