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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1964803941677688 6.5778e-08  
a 2.575463912194043 2.1444e-08 AU
q 2.069435747561293 1.7434e-07 AU
i 14.01377256546539 6.7655e-06 deg
node 74.14138238311531 2.9963e-05 deg
peri 199.7548666620384 3.706e-05 deg
M 263.5713911277917 2.5996e-05 deg
tp 2457404.875682344203
(2016-Jan-17.37568234)
0.00011093 JED
period 1509.668627874081
4.13
1.8855e-05
5.162e-08
d
yr
n .2384629271305405 2.9783e-09 deg/d
Q 3.081492076826792 2.5658e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      955  
   data-arc span      8683 days (23.77 yr)  
   first obs. used      1991-09-05  
   last obs. used      2015-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51629  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:22:48  

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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