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18739 Larryhu (1998 SH79)
Classification: Main-belt Asteroid          SPK-ID: 2018739
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1512927136667294 1.5706e-08  
a 2.289520194657189 6.7878e-09 au
q 1.943132471412725 3.605e-08 au
i 4.726672427054162 9.0481e-07 deg
node 76.44328436410393 1.1793e-05 deg
peri 255.4169588340297 1.5188e-05 deg
M 169.3489646634512 7.0189e-06 deg
tp 2458605.255776086012
(2019-May-01.75577609)
2.3786e-05 TDB
period 1265.36303918298
3.46
5.6272e-06
1.541e-08
d
yr
n .2845033313383682 1.2652e-09 deg/d
Q 2.635907917901654 7.8148e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1963  
   data-arc span      15934 days (43.62 yr)  
   first obs. used      1977-08-08  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:46:35  

Additional Information
 Earth MOID = .937073 au 
 Jupiter MOID = 2.7036 au 
 T_jup = 3.580 
[ 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 14.45   n/a MPCxxxxx  
diameter diameter 2.694 km 0.487 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.603 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.321   0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18739 Larryhu           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Larry Zhixing Hu (b. 1985) was awarded third place in the 2003 Intel International Science and Engineering Fair for his computer science team project. He attends the UMS Wright Preparatory School, Mobile, Alabama, 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
 1998 SH79 = 1991 RP30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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