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20349 (1998 HU123)
Classification: Main-belt Asteroid          SPK-ID: 2020349
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 .1595817659449188 2.6297e-08  
a 2.576891481884771 1.0437e-08 au
q 2.16566658855718 7.162e-08 au
i 14.6072931102311 5.1217e-07 deg
node 141.8774489868824 3.147e-06 deg
peri 294.3722385700542 8.3877e-06 deg
M 302.3021013607139 9.704e-06 deg
tp 2459442.658722802560
(2021-Aug-16.15872280)
4.1279e-05 TDB
period 1510.924007023773
4.14
9.179e-06
2.513e-08
d
yr
n .2382647957981224 1.4475e-09 deg/d
Q 2.988116375212361 1.2102e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2224  
   data-arc span      11198 days (30.66 yr)  
   first obs. used      1990-06-15  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43306  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:36  

Additional Information
 Earth MOID = 1.22504 au 
 Jupiter MOID = 2.31011 au 
 T_jup = 3.364 
[ 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 13.61   n/a E2021B10  
diameter diameter 5.155 km 0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.246 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.]
geometric albedo albedo 0.290   0.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20349 (1998 HU123)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HU123 = 1997 GG32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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