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19485 (1998 HC122)
Classification: Main-belt Asteroid          SPK-ID: 2019485
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07467097338104049 1.9432e-08  
a 2.977089120780026 1.2029e-08 au
q 2.754786978289276 5.4981e-08 au
i 11.28262578804412 4.9486e-07 deg
node 127.7347372736057 4.7056e-06 deg
peri 159.0958684952155 1.7819e-05 deg
M 83.17110853080239 1.4696e-05 deg
tp 2458767.032870758494
(2019-Oct-10.53287076)
7.6516e-05 TDB
period 1876.230451697656
5.14
1.1372e-05
3.113e-08
d
yr
n .1918740843771423 1.1629e-09 deg/d
Q 3.199391263270777 1.2928e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2509  
   data-arc span      10604 days (29.03 yr)  
   first obs. used      1992-02-01  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44758  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:54:56  

Additional Information
 Earth MOID = 1.73968 au 
 Jupiter MOID = 2.00322 au 
 T_jup = 3.227 
[ 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 12.92   n/a E2021B10  
diameter diameter 10.416 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 146.496 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 0.163   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19485 (1998 HC122)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HC122 = 1992 CT4 = 1999 NL10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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