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11521 Erikson (1991 GE9)
Classification: Main-belt Asteroid          SPK-ID: 2011521
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1626022288682259 3.7264e-08  
a 3.162711039844495 1.7072e-08 au
q 2.648447175499636 1.1475e-07 au
i 2.14357862145457 3.9394e-06 deg
node 119.2482567675373 0.00011656 deg
peri 321.9562650594117 0.00011737 deg
M 205.4968604949642 1.4914e-05 deg
tp 2460082.203381978863
(2023-May-17.70338198)
8.9535e-05 TDB
period 2054.412735749263
5.62
1.6634e-05
4.554e-08
d
yr
n .1752325585485162 1.4189e-09 deg/d
Q 3.676974904189354 1.9848e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1747  
   data-arc span      11672 days (31.96 yr)  
   first obs. used      1988-09-07  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49948  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:59:01  

Additional Information
 Earth MOID = 1.66433 au 
 Jupiter MOID = 1.56733 au 
 T_jup = 3.183 
[ 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 13.38   n/a E2021B10  
diameter diameter 11.810 km 0.211 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 13.857 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 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11521 Erikson           Discovered 1991 Apr. 10 by E. W. Elst at the European Southern Observatory.
Erik H. Erikson (1902-1994) was a German-American psychoanalyst who made important contributions to the field of psychosocial development. Through his friendship with Anna Freud, he became interested in child psychoanalysis. His views on personality development were published in Childhood and Society (1950).
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000523/MPCPages.arcLast Updated: 2013-03-29

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Alternate Designations
 1991 GE9 = 1988 RS1 = 1991 FD3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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