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JPL Small-Body Database Browser
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2285 Ron Helin (1976 QB)
Classification: Main-belt Asteroid          SPK-ID: 2002285
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .2073348222810613 3.3361e-08  
a 2.220535561404339 5.0848e-09 au
q 1.760141215411794 7.4924e-08 au
i 5.332084098942182 3.6038e-06 deg
node 157.8061405041714 2.8289e-05 deg
peri 182.7525760674565 2.9391e-05 deg
M 317.8909515578129 6.332e-06 deg
tp 2458741.870226145846
(2019-Sep-15.37022615)
2.1116e-05 TDB
period 1208.606779190877
3.31
4.1514e-06
1.137e-08
d
yr
n .2978636279377881 1.0231e-09 deg/d
Q 2.680929907396885 6.1391e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2156  
   data-arc span      15808 days (43.28 yr)  
   first obs. used      1976-08-26  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48451  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:13:29  

Additional Information
 Earth MOID = .750693 au 
 Jupiter MOID = 2.7133 au 
 T_jup = 3.616 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO502175  
rotation period rot_per 12. h n/a LCDB (Rev. 2019-January); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]

2285 Ron Helin           Discovered 1976 Aug. 27 by S. J. Bus at Palomar.
Named in honor of Ronald P. Helin, husband of Eleanor F. Helin. His never-ending friendship and encouragement have been invaluable to the success of the Palomar planet-crossing asteroid survey.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 6531Last Updated: 2006-03-21
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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