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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04540756880863506 9.1638e-09  
a 2.763292578361027 1.2373e-08 au
q 2.637818180470708 2.3485e-08 au
i 9.603608041416441 2.995e-07 deg
node 89.7074483931528 5.4417e-06 deg
peri 35.53788087161866 4.0446e-05 deg
M 64.79618192994013 3.8529e-05 deg
tp 2458898.514807652502
(2020-Feb-19.01480765)
0.00017963 TDB
period 1677.794370085654
4.59
1.1269e-05
3.085e-08
d
yr
n .2145674144690456 1.4411e-09 deg/d
Q 2.888766976251346 1.2935e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2122  
   data-arc span      13962 days (38.23 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45824  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:54:57  

Additional Information
 Earth MOID = 1.65978 au 
 Jupiter MOID = 2.18855 au 
 T_jup = 3.319 
[ 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 13.32   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1998 HW122 = 1982 YE4 = 2000 UB26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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