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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06949064433221196 1.3186e-08  
a 2.768636289564201 8.4672e-09 au
q 2.576241969880841 3.8174e-08 au
i 4.870434213625563 1.0616e-06 deg
node 1.368839830528269 9.1164e-06 deg
peri 191.4454333829855 1.5157e-05 deg
M 286.4030444485605 1.5199e-05 deg
tp 2459740.496984994326
(2022-Jun-09.99698499)
7.1542e-05 TDB
period 1682.663551366632
4.61
7.719e-06
2.113e-08
d
yr
n .2139465133761375 9.8145e-10 deg/d
Q 2.961030609247562 9.0556e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3304  
   data-arc span      9014 days (24.68 yr)  
   first obs. used      1996-09-07  
   last obs. used      2021-05-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37468  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:29:52  

Additional Information
 Earth MOID = 1.57667 au 
 Jupiter MOID = 1.99687 au 
 T_jup = 3.329 
[ 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 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

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 ]
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