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19486 (1998 HW122)
Classification: Main-belt Asteroid          SPK-ID: 2019486
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04540756870568965 9.1568e-09  
a 2.763292577634814 1.225e-08 au
q 2.637818180061938 2.3473e-08 au
i 9.603608044276482 2.9944e-07 deg
node 89.70744854658969 5.4358e-06 deg
peri 35.53788343465986 4.0051e-05 deg
M 64.7961795433873 3.8191e-05 deg
tp 2458898.514818894172
(2020-Feb-19.01481889)
0.00017802 TDB
period 1677.794369424249
4.59
1.1157e-05
3.055e-08
d
yr
n .2145674145536305 1.4268e-09 deg/d
Q 2.888766975207689 1.2806e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2134  
   data-arc span      13970 days (38.25 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45711  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:54:14  

Additional Information
 Earth MOID = 1.65978 au 
 Jupiter MOID = 2.18855 au 
 T_jup = 3.319 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457303.5 (2015-Oct-08.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04580471455795359 9.0744e-09  
q 2.638363957547753 2.3461e-08 au
tp 2457230.702454026304
(2015-Jul-27.20245403)
0.00017654 TDB
node 89.78985611115885 5.433e-06 deg
peri 37.7972436953996 3.9601e-05 deg
i 9.603011345100219 2.9955e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2134  
   data-arc span      13970 days (38.25 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45711  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:54:14  

Additional Information
 Jupiter MOID = 2.18855 au 
 T_jup = 3.319 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.234466776796318E-17 -1.887047431180623E-16 1.232745009238705E-14 1.37547295648992E-14 -1.333322500791386E-14 7.80805699269713E-16
q -1.887047431180623E-16 5.504376488349871E-16 -2.503880674979056E-13 -3.988347392518538E-14 -1.024858445803799E-14 -2.075097290771492E-15
tp 1.232745009238705E-14 -2.503880674979056E-13 3.116726648064333E-8 1.628006902901723E-10 6.924485186618397E-9 -7.375568046911604E-12
node 1.37547295648992E-14 -3.988347392518538E-14 1.628006902901723E-10 2.951775703686539E-11 7.200952052227108E-12 3.994070369504544E-13
peri -1.333322500791386E-14 -1.024858445803799E-14 6.924485186618397E-9 7.200952052227108E-12 1.568256477165606E-9 -2.00315119789989E-12
i 7.80805699269713E-16 -2.075097290771492E-15 -7.375568046911604E-12 3.994070369504544E-13 -2.00315119789989E-12 8.973050429888641E-14

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.33   n/a MPCxxxxx  
diameter diameter 6.607 km 0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 184.437 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 0.161   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19486 (1998 HW122)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 HW122 = 1982 YE4 = 2000 UB26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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