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JPL Small-Body Database Browser
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20327 (1998 HQ39)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020327
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .169932683859866 4.1903e-08  
a 3.202282706196324 2.3246e-08 au
q 2.658110211454348 1.3482e-07 au
i 2.091781059310569 5.4699e-06 deg
node 42.13077977145659 0.00013385 deg
peri 256.6036446644363 0.00013479 deg
M 158.1988798861114 1.9075e-05 deg
tp 2457680.709678820413
(2016-Oct-19.20967882)
0.00010733 TDB
period 2093.090139848212
5.73
2.2791e-05
6.24e-08
d
yr
n .1719945037943309 1.8728e-09 deg/d
Q 3.7464552009383 2.7196e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1041  
   data-arc span      9791 days (26.81 yr)  
   first obs. used      1992-03-26  
   last obs. used      2019-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54069  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:39:39  

Additional Information
 Earth MOID = 1.64268 au 
 Jupiter MOID = 1.47986 au 
 T_jup = 3.170 
[ 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 14.0   n/a MPO296299  
diameter diameter 7.989 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.388 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.084   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20327 (1998 HQ39)          Discovered 1998-Apr-20 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HQ39 = 1999 ND33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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