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18803 Hillaryoas (1999 JH77)
Classification: Main-belt Asteroid          SPK-ID: 2018803
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1326206005477132 2.121e-08  
a 2.282183142148899 7.1379e-09 au
q 1.979518643277244 4.9245e-08 au
i 6.047400383041123 4.952e-07 deg
node 110.0894430099009 6.7702e-06 deg
peri 126.049392396604 7.9354e-06 deg
M 91.34468380534463 7.0716e-06 deg
tp 2458880.974927212650
(2020-Feb-01.47492721)
2.4413e-05 TDB
period 1259.28539474254
3.45
5.908e-06
1.618e-08
d
yr
n .2858764196765752 1.3412e-09 deg/d
Q 2.584847641020553 8.0846e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1997  
   data-arc span      15063 days (41.24 yr)  
   first obs. used      1979-09-16  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:24  

Additional Information
 Earth MOID = .973056 au 
 Jupiter MOID = 2.42536 au 
 T_jup = 3.586 
[ 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 14.38   n/a E2021B10  
diameter diameter 3.908 km 0.164 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.40 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.201   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18803 Hillaryoas           Discovered 1999 May 12 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Hillary Joan Oas (b. 1987) was awarded third place in the 2003 Intel International Science and Engineering Fair for her environmental science team project. She attends the Winona Senior High School, Winona, Minnesota, 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

[ show close-approach data ]
Alternate Designations
 1999 JH77 = 1979 SW = 1990 WL4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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