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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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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04540757383505362 9.1705e-09  
a 2.763292596669156 1.2492e-08 au
q 2.637818184058044 2.3497e-08 au
i 9.603608083364374 2.9955e-07 deg
node 89.70744827425355 5.4471e-06 deg
peri 35.53787966503092 4.0819e-05 deg
M 64.79618219260277 3.8848e-05 deg
tp 2458898.514803427158
(2020-Feb-19.01480343)
0.00018115 TDB
period 1677.794386759934
4.59
1.1377e-05
3.115e-08
d
yr
n .2145674123366287 1.455e-09 deg/d
Q 2.888767009280268 1.3059e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2110  
   data-arc span      13946 days (38.18 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-02-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45933  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:16:23  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2060-Nov-23 06:59 00:01 Psych 0.0441020909170483 0.044096827894032 0.044107356666992 3.74164419049071 3.74164411716919 2473786.790787692 1.19131101767285 613.219588519313 44.625636197989 65.0115137450568 133941.134980409 T 31 CATAB v2.0f-lin.ifort 2021-Mar-17 02:17:28 2021-Mar-17 02:17

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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