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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1204181749865505 2.1624e-08  
a 2.74036277904651 1.0682e-08 au
q 2.410373294392658 5.7298e-08 au
i 2.872906261011238 7.2478e-07 deg
node 241.4718173923816 7.5309e-06 deg
peri 238.8342920897129 7.8813e-06 deg
M 134.7806557048239 6.3091e-06 deg
tp 2458580.151721884413
(2019-Apr-06.65172188)
2.6609e-05 TDB
period 1656.954248766267
4.54
9.6879e-06
2.652e-08
d
yr
n .2172661075392083 1.2703e-09 deg/d
Q 3.070352263700363 1.1968e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2601  
   data-arc span      15792 days (43.24 yr)  
   first obs. used      1977-12-07  
   last obs. used      2021-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41921  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 14:31:24  

Additional Information
 Earth MOID = 1.4278 au 
 Jupiter MOID = 2.0132 au 
 T_jup = 3.338 
[ 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 12.28   n/a E2020-QM5  
diameter diameter 13.629 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.624 h n/a LCDB (Rev. 2020-October); 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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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

[ show close-approach data ]
Alternate Designations
 1981 RU = 1972 TZ3 = 1977 XB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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