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2872 Gentelec (1981 RU)
Classification: Main-belt Asteroid          SPK-ID: 2002872
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1209800467474754 4.6779e-08  
a 2.740103008785876 1.3194e-08 au
q 2.408605218690063 1.307e-07 au
i 2.873645112059338 4.2876e-06 deg
node 241.4764334404053 0.00010982 deg
peri 238.7503675387359 0.00011185 deg
M 4.428595628883358 2.0923e-05 deg
tp 2458580.119619522056
9.6272e-05 TDB
period 1656.718650085852
n .21729700452237 1.5694e-09 deg/d
Q 3.071600798881689 1.479e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2031  
   data-arc span      15340 days (42.00 yr)  
   first obs. used      1977-12-07  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45333  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:21:44  

Additional Information
 Earth MOID = 1.42645 au 
 Jupiter MOID = 2.0144 au 
 T_jup = 3.338 
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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 12.2   n/a MPO384777  
diameter diameter 13.629 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 10.624 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 0.150   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2872 Gentelec (1981 RU)          Discovered 1981-Sep-05 by Oak Ridge Observatory at Oak Ridge
Discovered at Oak Ridge Observatory (until 1981 Harvard College's Agassiz Station). The principal observers are R. E. McCrosky, C.-Y. Shao, G. Schwartz, and J. H. Bulger, with some assistance from others.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 RU = 1972 TZ3 = 1977 XB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2019-Dec-15 08:49 UT
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