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19489 (1998 HL149)
Classification: Main-belt Asteroid          SPK-ID: 2019489
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1191693538213577 2.0157e-08  
a 2.552220750129239 9.0717e-09 au
q 2.248074252526877 5.2672e-08 au
i 5.767936899635348 3.985e-07 deg
node 31.33860488733265 1.4199e-05 deg
peri 179.4378463590134 2.1266e-05 deg
M 214.8925893746675 1.1365e-05 deg
tp 2459800.792436460338
(2022-Aug-09.29243646)
4.8893e-05 TDB
period 1489.278019602359
4.08
7.9403e-06
2.174e-08
d
yr
n .2417278676389255 1.2888e-09 deg/d
Q 2.856367247731601 1.0153e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2116  
   data-arc span      10743 days (29.41 yr)  
   first obs. used      1991-10-05  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49612  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:55:00  

Additional Information
 Earth MOID = 1.24149 au 
 Jupiter MOID = 2.10447 au 
 T_jup = 3.422 
[ 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 13.96   n/a E2021B10  
diameter diameter 4.747 km 0.063 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.714 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.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.261   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19489 (1998 HL149)          Discovered 1998-Apr-25 by Elst, E. W. at La Silla
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HL149 = 1999 RZ89 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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