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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1964803929807098 6.9386e-08  
a 2.575463911873284 2.5548e-08 AU
q 2.069435750360785 1.8025e-07 AU
i 14.01377402829322 7.8219e-06 deg
node 74.14138164122016 3.0236e-05 deg
peri 199.7548654073843 3.7384e-05 deg
M 263.5713931774552 2.653e-05 deg
tp 2457404.875673673346
(2016-Jan-17.37567367)
0.00011377 JED
period 1509.668627592051
4.13
2.2463e-05
6.15e-08
d
yr
n .2384629271750892 3.5482e-09 deg/d
Q 3.081492073385784 3.0567e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      872  
   data-arc span      8546 days (23.40 yr)  
   first obs. used      1991-09-05  
   last obs. used      2015-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51835  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:51:22  

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 (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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