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20312 Danahy (1998 FH118)
Classification: Main-belt Asteroid          SPK-ID: 2020312
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1312764814184262 2.6943e-08  
a 2.428366520616906 7.9791e-09 au
q 2.109579108196013 6.5648e-08 au
i 5.702875021585672 4.1353e-06 deg
node 345.5204509238958 3.6326e-05 deg
peri 51.67451459466537 4.0401e-05 deg
M 107.2363197987316 1.8081e-05 deg
tp 2458588.773156890466
(2019-Apr-15.27315689)
6.8996e-05 TDB
period 1382.196477812971
3.78
6.8124e-06
1.865e-08
d
yr
n .2604550118443527 1.2837e-09 deg/d
Q 2.747153933037799 9.0266e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1834  
   data-arc span      11589 days (31.73 yr)  
   first obs. used      1988-09-15  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48111  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:03:34  

Additional Information
 Earth MOID = 1.12165 au 
 Jupiter MOID = 2.6791 au 
 T_jup = 3.491 
[ 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 14.1   n/a MPO452457  
rotation period rot_per 4.569 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

20312 Danahy           Discovered 1998 Mar. 31 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Thomas Danahy mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Nanuet High School, Nanuet, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

[ show close-approach data ]
Alternate Designations
 1998 FH118 = 1988 SJ = 1990 EX6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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