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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08157026309817436 2.7381e-08  
a 2.385555973549511 8.0496e-09 au
q 2.190965545151656 6.5291e-08 au
i 6.038793168729376 3.591e-06 deg
node 125.2968582155491 2.9766e-05 deg
peri 317.9966479390597 3.8101e-05 deg
M 211.497120419332 2.4533e-05 deg
tp 2459951.656229884007
(2023-Jan-07.15622988)
9.2654e-05 TDB
period 1345.807187864523
3.68
6.8118e-06
1.865e-08
d
yr
n .267497456727984 1.3539e-09 deg/d
Q 2.580146401947366 8.7063e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1639  
   data-arc span      8645 days (23.67 yr)  
   first obs. used      1997-12-08  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 00:36:04  

Additional Information
 Earth MOID = 1.21139 au 
 Jupiter MOID = 2.56309 au 
 T_jup = 3.523 
[ 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 14.86   n/a MPO636644  
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

Alternate Designations
 1998 HH134 = 1999 NK33 = 2000 WY48 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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