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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09410807800513439 4.2161e-08  
a 3.025941516732522 2.3151e-08 au
q 2.741175976436883 1.3534e-07 au
i 6.288599576414097 6.2874e-06 deg
node 18.60269985446992 4.2449e-05 deg
peri 271.4823025570568 5.5192e-05 deg
M 356.8588455324614 3.4267e-05 deg
tp 2459217.275520910207
(2021-Jan-02.77552091)
0.00018297 TDB
period 1922.601256985255
5.26
2.2064e-05
6.041e-08
d
yr
n .1872463146957991 2.1489e-09 deg/d
Q 3.310707057028161 2.533e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55535  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 16:50:38  

Additional Information
 Earth MOID = 1.73266 au 
 Jupiter MOID = 1.86721 au 
 T_jup = 3.229 
[ 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 14.88   n/a E2021B55  
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. 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:
[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

[ show close-approach data ]
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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