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1524 Joensuu (1939 SB)
Classification: Main-belt Asteroid          SPK-ID: 2001524
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .122208559069483 1.7253e-08  
a 3.113156404883984 1.4138e-08 au
q 2.73270204648518 5.6439e-08 au
i 12.69589425967804 8.2839e-07 deg
node 347.6363645330546 5.0759e-06 deg
peri 1.564290692781482 9.268e-06 deg
M 340.9464982527196 6.6317e-06 deg
tp 2459502.687192973137
(2021-Oct-15.18719297)
3.7083e-05 TDB
period 2006.318312369316
5.49
1.3668e-05
3.742e-08
d
yr
n .1794331426775775 1.2223e-09 deg/d
Q 3.493610763282788 1.5866e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2775  
   data-arc span      9671 days (26.48 yr)  
   first obs. used      1995-01-03  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38579  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:29:10  

Additional Information
 Earth MOID = 1.72556 au 
 Jupiter MOID = 1.93034 au 
 T_jup = 3.169 
[ 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 10.76   n/a E2021B10  
diameter diameter 45.056 km 0.291 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.276 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.064   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1524 Joensuu (1939 SB)          Discovered 1939-Sep-18 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1939 SB = 1931 EL = 1933 QO = 1936 DG = 1958 DH1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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