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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04552568858354685 3.8718e-08  
a 2.76386098341019 1.3362e-08 au
q 2.638034308991242 1.1039e-07 au
i 9.603688479473188 4.0317e-06 deg
node 89.7109520316418 2.6022e-05 deg
peri 35.74834948391377 6.141e-05 deg
M 21.6795477910354 5.3223e-05 deg
tp 2458899.430425370895
0.00024824 TDB
period 1678.312076302769
n .2145012272050504 1.5555e-09 deg/d
Q 2.889687657829138 1.397e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1902  
   data-arc span      13641 days (37.35 yr)  
   first obs. used      1982-12-23  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45504  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:01:50  

Additional Information
 Earth MOID = 1.66015 au 
 Jupiter MOID = 2.18827 au 
 T_jup = 3.318 
[ 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 13.3   n/a MPO384921  
diameter diameter 6.607 km 0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.161   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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
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 27 CATAB v2.0f-lin.ifort 2020-May-20 05:02:02 2020-May-20 05:02

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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