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3128 Obruchev (1979 FJ2)
Classification: Main-belt Asteroid          SPK-ID: 2003128
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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1590480852789203 1.9936e-08  
a 3.113852356575275 1.4457e-08 au
q 2.618600101420724 6.1482e-08 au
i 2.938470504428538 1.3645e-06 deg
node 102.3630129839646 1.6013e-05 deg
peri 187.9576485178883 1.785e-05 deg
M 128.3565654797319 9.197e-06 deg
tp 2458484.915312136090
(2019-Jan-01.41531214)
4.9069e-05 TDB
period 2006.99112404722
5.49
1.3977e-05
3.827e-08
d
yr
n .1793729905860461 1.2491e-09 deg/d
Q 3.609104611729826 1.6756e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2958  
   data-arc span      28685 days (78.54 yr)  
   first obs. used      1942-09-10  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43517  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:45:59  

Additional Information
 Earth MOID = 1.60041 au 
 Jupiter MOID = 1.57085 au 
 T_jup = 3.197 
[ 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 12.22   n/a E2021B10  
diameter diameter 20.396 km 0.207 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.642 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.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.107   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3128 Obruchev (1979 FJ2)          Discovered 1979-Mar-23 by Chernykh, N. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1979 FJ2 = 1942 RG1 = 1952 JE = 1976 YU4 = 1979 HS2 = 1981 VG2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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