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1541 Estonia (1939 CK)
Classification: Main-belt Asteroid          SPK-ID: 2001541
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0697700911117303 7.6732e-09  
a 2.767490553871295 8.7417e-09 au
q 2.574402485776842 2.4288e-08 au
i 4.870794282142761 4.9506e-07 deg
node 1.37820386720787 4.048e-06 deg
peri 191.7101939095396 1.1619e-05 deg
M 201.3880387935261 1.3458e-05 deg
tp 2459741.402537221753
(2022-Jun-10.90253722)
6.4139e-05 TDB
period 1681.619162710059
4.60
7.9676e-06
2.181e-08
d
yr
n .2140793872851878 1.0143e-09 deg/d
Q 2.960578621965749 9.3516e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2880  
   data-arc span      8763 days (23.99 yr)  
   first obs. used      1996-09-07  
   last obs. used      2020-09-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38672  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Sep-16 14:40:05  

Additional Information
 Earth MOID = 1.57401 au 
 Jupiter MOID = 1.99936 au 
 T_jup = 3.330 
[ 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 11.4   n/a MPO502168  
diameter diameter 22.000 km 0.342 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.1 h n/a LCDB (Rev. 2019-August); 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:
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.140   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Xc   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)

1541 Estonia (1939 CK)          Discovered 1939-Feb-12 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1939 CK = 1930 FE = 1930 FV = 1950 RG1 = 1950 SR = 1959 RF1 = A916 GE = A923 VE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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