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8625 Simonhelberg (1981 EX15)
Classification: Main-belt Asteroid          SPK-ID: 2008625
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0803400400474051 4.7355e-08  
a 2.606729839969301 1.4007e-08 au
q 2.397305060233402 1.2944e-07 au
i 3.629710922379901 4.3856e-06 deg
node 326.4704787014399 6.1834e-05 deg
peri 57.2002488595931 6.6908e-05 deg
M 271.6984326751393 2.8063e-05 deg
tp 2459377.558185734744
(2021-Jun-12.05818573)
0.00012143 TDB
period 1537.242780358791
4.21
1.239e-05
3.392e-08
d
yr
n .2341855200750895 1.8876e-09 deg/d
Q 2.816154619705201 1.5132e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1357  
   data-arc span      24416 days (66.85 yr)  
   first obs. used      1953-10-01  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:00:34  

Additional Information
 Earth MOID = 1.40255 au 
 Jupiter MOID = 2.54297 au 
 T_jup = 3.404 
[ 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 14.5   n/a MPO435781  
diameter diameter 3.694 km 0.865 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.27 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:
[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 0.247   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8625 Simonhelberg           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
American actor and comedian Simon Maxwell Helberg (b. 1980) portrays the fictional Caltech aerospace engineer Howard Wolowitz in the television sitcom "The Big Bang Theory".
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2015-08-29Last Updated: 2015-09-02

[ show close-approach data ]
Alternate Designations
 1981 EX15 = 1949 SE = 1978 NH5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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