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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06977009113758445 7.6705e-09  
a 2.767490554205396 8.6849e-09 au
q 2.574402486016081 2.4285e-08 au
i 4.870794289539663 4.949e-07 deg
node 1.378203852433218 4.0479e-06 deg
peri 191.7101941827395 1.1592e-05 deg
M 201.3880384326755 1.3415e-05 deg
tp 2459741.402539041512
(2022-Jun-10.90253904)
6.391e-05 TDB
period 1681.619163014575
4.60
7.9159e-06
2.167e-08
d
yr
n .2140793872464213 1.0077e-09 deg/d
Q 2.96057862239471 9.2909e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3016  
   data-arc span      8836 days (24.19 yr)  
   first obs. used      1996-09-07  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37904  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-21 09:25:19  

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. 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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