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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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1964803647705552 7.3577e-08  
a 2.575463896728768 2.9179e-08 AU
q 2.069435810846104 1.8753e-07 AU
i 14.01377703665335 8.5955e-06 deg
node 74.14137918900519 3.0387e-05 deg
peri 199.7548723911468 3.7575e-05 deg
M 263.5713950664752 2.6744e-05 deg
tp 2457404.875662184917
(2016-Jan-17.37566218)
0.00011509 JED
period 1509.66861427608
4.13
2.5656e-05
7.024e-08
d
yr
n .2384629292784416 4.0526e-09 deg/d
Q 3.081491982611432 3.4912e-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 = 1.05995 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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