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18771 Sisiliang (1999 JA26)
Classification: Main-belt Asteroid          SPK-ID: 2018771
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1895109208585815 2.8262e-08  
a 2.400222377836645 9.4871e-09 au
q 1.945354024747449 6.8772e-08 au
i 2.144772902807945 4.0019e-06 deg
node 208.830225040571 8.0805e-05 deg
peri 120.0253466485545 8.1597e-05 deg
M 257.0727940205995 1.3921e-05 deg
tp 2459784.832135057877
(2022-Jul-24.33213506)
5.3899e-05 TDB
period 1358.237283238941
3.72
8.0528e-06
2.205e-08
d
yr
n .2650494169483558 1.5714e-09 deg/d
Q 2.855090730925842 1.1285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1364  
   data-arc span      14490 days (39.67 yr)  
   first obs. used      1981-08-30  
   last obs. used      2021-05-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53285  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:03:53  

Additional Information
 Earth MOID = .934562 au 
 Jupiter MOID = 2.49549 au 
 T_jup = 3.501 
[ 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 15.21   n/a MPCxxxxx  
diameter diameter 5.708 km 0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.054   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18771 Sisiliang           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sisi Liang (b. 1985) was awarded third place in the 2003 Intel International Science and Engineering Fair for her earth and space sciences team project. She attends the Robert F. Kennedy High School, Flushing, New York, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040830/MPCPages.arcLast Updated: 2004-09-06

Alternate Designations
 1999 JA26 = 1981 QW3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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