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JPL Small-Body Database Browser
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37951 (1998 HE42)
Classification: Main-belt Asteroid          SPK-ID: 2037951
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1831966444417757 3.2375e-08  
a 2.600173323664879 9.6008e-09 au
q 2.123830295802454 8.3438e-08 au
i 4.884779621215624 3.9022e-06 deg
node 150.2295489881785 5.405e-05 deg
peri 347.7003093681781 5.5847e-05 deg
M 152.7925922120646 1.5394e-05 deg
tp 2458350.517486974215
(2018-Aug-20.01748697)
6.3671e-05 TDB
period 1531.446657862293
4.19
8.482e-06
2.322e-08
d
yr
n .2350718506268542 1.302e-09 deg/d
Q 3.076516351527304 1.136e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1105  
   data-arc span      9755 days (26.71 yr)  
   first obs. used      1992-12-02  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57353  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 04:41:17  

Additional Information
 Earth MOID = 1.13758 au 
 Jupiter MOID = 1.95485 au 
 T_jup = 3.386 
[ 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 15.0   n/a MPO474235  
diameter diameter 3.056 km 0.179 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.719 h n/a LCDB (Rev. 2019-August); 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 0.227   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

37951 (1998 HE42)          Discovered 1998-Apr-24 by Spacewatch at Kitt Peak
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HE42 = 2000 SM85 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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