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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06994401227815182 3.3034e-08  
a 2.767332885745541 9.7994e-09 au
q 2.573774520407221 9.1831e-08 au
i 4.871024799399899 3.918e-06 deg
node 1.380633112509402 3.9121e-05 deg
peri 191.8755818350051 4.6526e-05 deg
M 115.5552492387279 2.5549e-05 deg
tp 2458060.768567616595
(2017-Nov-03.26856762)
0.00011895 TDB
period 1681.475458173352
4.60
8.9314e-06
2.445e-08
d
yr
n .2140976832282055 1.1372e-09 deg/d
Q 2.96089125108386 1.0485e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2886  
   data-arc span      35052 days (95.97 yr)  
   first obs. used      1923-11-09  
   last obs. used      2019-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44522  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:06:06  

Additional Information
 Earth MOID = 1.5737 au 
 Jupiter MOID = 2.00034 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 11.3   n/a MPO435710  
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-January); 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2155-Jul-17 07:27 00:02 Hebe 0.0289573095080456 0.0289458991007747 0.0289687215093537 7.15218747188955 7.15218744187303 2508354.810296270 1.96070561338873 662.360497648408 30.3660048229212 30.8404150465286 73331.2281735857 T 35 CATAB v2.0f-lin.ifort 2019-Nov-07 02:06:23 2019-Nov-07 02:06
2168-Jul-26 23:31 < 00:01 Inter 0.033590196315154 0.0335755806572073 0.0336048123211243 6.51407746380597 6.5140773969018 2513113.480090835 0.400076264979914 748.320830529459 32.6203337226459 -13.1945365710142 35748.3707908111 T 35 CATAB v2.0f-lin.ifort 2019-Nov-07 02:06:23 2019-Nov-07 02:06

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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