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116989 (2004 HW42)
Classification: Main-belt Asteroid          SPK-ID: 2116989
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09351201577977469 4.2231e-08  
a 3.023713204295001 2.3183e-08 au
q 2.740959687421454 1.3535e-07 au
i 6.289867049052455 6.2889e-06 deg
node 18.63475757816764 4.2445e-05 deg
peri 271.6736661021901 5.531e-05 deg
M 319.1755141578607 3.4526e-05 deg
tp 2459218.284789516967
(2021-Jan-03.78478952)
0.00018378 TDB
period 1920.477933984915
5.26
2.2087e-05
6.047e-08
d
yr
n .1874533383744818 2.1558e-09 deg/d
Q 3.306466721168548 2.5351e-08 au
  Orbit Determination Parameters
   # obs. used (total)      539  
   data-arc span      8124 days (22.24 yr)  
   first obs. used      1998-03-25  
   last obs. used      2020-06-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55549  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 18:21:53  

Additional Information
 Earth MOID = 1.73438 au 
 Jupiter MOID = 1.87236 au 
 T_jup = 3.230 
[ 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 14.9   n/a MPO469209  
diameter diameter 6.374 km 0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 56.595 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.]
geometric albedo albedo 0.057   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

116989 (2004 HW42)          Discovered 2004-Apr-20 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Alternate Designations
 2004 HW42 = 2000 SQ340 = 2001 YR141 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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