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18777 Hobson (1999 JA41)
Classification: Main-belt Asteroid          SPK-ID: 2018777
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1842550332168602 3.6364e-08  
a 2.562046116532767 9.2326e-09 au
q 2.089976224227894 9.3161e-08 au
i 4.322853632868851 3.8904e-06 deg
node 105.4479097893732 6.0098e-05 deg
peri 180.6622901896993 6.2282e-05 deg
M 54.23658331724771 1.4819e-05 deg
tp 2458974.832684239139
(2020-May-05.33268424)
6.2052e-05 TDB
period 1497.886273527019
4.10
8.0966e-06
2.217e-08
d
yr
n .2403386734777407 1.2991e-09 deg/d
Q 3.034116008837639 1.0934e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1510  
   data-arc span      9374 days (25.66 yr)  
   first obs. used      1995-05-22  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51057  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:37:48  

Additional Information
 Earth MOID = 1.07163 au 
 Jupiter MOID = 2.12818 au 
 T_jup = 3.406 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.99   n/a E2021B10  
rotation period rot_per 10.227 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Fatka, P.; Vokrouhlicky, D.; Scheeres, D.J.; et al. (2018) Icarus 304, 110-126.]

18777 Hobson           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Christina Nicole Hobson (b. 1985) was awarded third place in the 2003 Intel International Science and Engineering Fair for her engineering project. She attends the Red Mountain High School, Mesa, Arizona, 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

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Alternate Designations
 1999 JA41 = 1995 KP2 = 1998 CE1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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