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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06958767060793751 1.321e-08  
a 2.76814267545568 8.4628e-09 au
q 2.575514074760295 3.821e-08 au
i 4.870450596923432 1.0624e-06 deg
node 1.37368470465385 9.1177e-06 deg
peri 191.5812471610196 1.515e-05 deg
M 244.3310972347907 1.5143e-05 deg
tp 2459740.999439723006
(2022-Jun-10.49943972)
7.1536e-05 TDB
period 1682.213573818108
4.61
7.7143e-06
2.112e-08
d
yr
n .2140037422138442 9.8138e-10 deg/d
Q 2.960771276151065 9.0517e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3179  
   data-arc span      8954 days (24.51 yr)  
   first obs. used      1996-09-07  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37093  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:35:30  

Additional Information
 Earth MOID = 1.57446 au 
 Jupiter MOID = 1.99807 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 11.44   n/a E2021B10  
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. 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:
[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

[ show close-approach data ]
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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