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7862 Keikonakamura (1981 EE28)
Classification: Main-belt Asteroid          SPK-ID: 2007862
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07758492885965329 3.8345e-08  
a 2.840972469195185 1.2543e-08 au
q 2.620555822280443 1.1018e-07 au
i 2.377462426827013 4.3334e-06 deg
node 33.11303262647305 7.9435e-05 deg
peri 353.1092011496684 8.2551e-05 deg
M 261.208210566515 2.375e-05 deg
tp 2459680.473561621108
(2022-Apr-10.97356162)
0.00011666 TDB
period 1749.036870112938
4.79
1.1583e-05
3.171e-08
d
yr
n .2058275649596536 1.3631e-09 deg/d
Q 3.061389116109927 1.3516e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2092  
   data-arc span      24118 days (66.03 yr)  
   first obs. used      1954-08-27  
   last obs. used      2020-09-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45375  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:25:05  

Additional Information
 Earth MOID = 1.62328 au 
 Jupiter MOID = 2.3076 au 
 T_jup = 3.304 
[ 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 13.47   n/a E2021B10  
diameter diameter 5.023 km 0.375 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.849 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.228   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7862 Keikonakamura           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Keiko Nakamura Messenger (b. 1973) is a space scientist at NASA's Johnson Space Center. Her work revealed the existence of organic globules in the Tagish Lake meteorite, furthering our understanding of organic material in the solar system.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

Alternate Designations
 1981 EE28 = 1954 QC1 = 1995 CP7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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