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18377 (1991 SH1)
Classification: Main-belt Asteroid          SPK-ID: 2018377
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1974216756007781 1.164e-08  
a 2.573798196060148 9.936e-09 au
q 2.065674643535694 2.9429e-08 au
i 14.01330236707009 4.098e-07 deg
node 74.10103285616445 2.1451e-06 deg
peri 199.7673181320432 7.4745e-06 deg
M 68.46298035666494 5.6843e-06 deg
tp 2458913.677335857522
(2020-Mar-05.17733586)
2.3311e-05 TDB
period 1508.204266793068
4.13
8.7335e-06
2.391e-08
d
yr
n .2386944579897503 1.3822e-09 deg/d
Q 3.081921748584602 1.1898e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2020  
   data-arc span      10750 days (29.43 yr)  
   first obs. used      1991-09-05  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47261  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:51  

Additional Information
 Earth MOID = 1.05295 au 
 Jupiter MOID = 2.03586 au 
 T_jup = 3.360 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.55   n/a E2021B10  
diameter diameter 10.792 km 0.178 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.060   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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