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40018 (1998 HH134)
Classification: Main-belt Asteroid          SPK-ID: 2040018
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 .08198646485158714 2.8667e-08  
a 2.38463084113703 8.7817e-09 au
q 2.189123388496138 6.7485e-08 au
i 6.038926522874011 3.791e-06 deg
node 125.2962124495469 3.4418e-05 deg
peri 318.0657807742924 4.4126e-05 deg
M 158.9771564632378 2.6852e-05 deg
tp 2458606.532905952779
(2019-May-03.03290595)
0.0001001 TDB
period 1345.024396045513
3.68
7.4299e-06
2.034e-08
d
yr
n .2676531377857761 1.4785e-09 deg/d
Q 2.580138293777921 9.5017e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1515  
   data-arc span      8230 days (22.53 yr)  
   first obs. used      1997-12-08  
   last obs. used      2020-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52931  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:47:41  

Additional Information
 Earth MOID = 1.20923 au 
 Jupiter MOID = 2.56359 au 
 T_jup = 3.524 
[ 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 14.85   n/a E2021B10  
diameter diameter 2.693 km 0.244 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 61.3451 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.154   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

40018 (1998 HH134)          Discovered 1998-Apr-19 by LINEAR at Socorro
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HH134 = 1999 NK33 = 2000 WY48 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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