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20328 (1998 HS42)
Classification: Main-belt Asteroid          SPK-ID: 2020328
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2729078883747571 3.7118e-08  
a 2.777727513058884 1.3848e-08 au
q 2.019663762989519 9.8773e-08 au
i 8.357352383362066 5.0006e-06 deg
node 154.110832847537 2.4352e-05 deg
peri 107.8816457206127 2.5929e-05 deg
M 165.2562839711942 8.9106e-06 deg
tp 2457824.273670984688
(2017-Mar-11.77367098)
3.9697e-05 TDB
period 1690.958260287529
4.63
1.2645e-05
3.462e-08
d
yr
n .2128970350449608 1.5921e-09 deg/d
Q 3.53579126312825 1.7627e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1538  
   data-arc span      9249 days (25.32 yr)  
   first obs. used      1994-08-10  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51728  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:43:16  

Additional Information
 Earth MOID = 1.02281 au 
 Jupiter MOID = 1.65027 au 
 T_jup = 3.264 
[ 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 13.9   n/a MPO381426  
diameter diameter 10.294 km 0.294 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.412 h n/a LCDB (Rev. 2019-January); 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 0.035   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20328 (1998 HS42)          Discovered 1998-Apr-30 by Linderholm, R. at Lime Creek
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HS42 = 1994 PH13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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