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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1221670457203261 3.8809e-08  
a 3.109031226373138 1.5524e-08 au
q 2.72921006639489 1.2257e-07 au
i 12.68770758806339 4.273e-06 deg
node 347.6985845860859 1.8079e-05 deg
peri 2.292122509097377 2.4586e-05 deg
M 269.1173007527777 1.8411e-05 deg
tp 2459505.992561733840
(2021-Oct-18.49256173)
0.000104 TDB
period 2002.331837978991
5.48
1.4997e-05
4.106e-08
d
yr
n .1797903789830151 1.3466e-09 deg/d
Q 3.488852386351387 1.7421e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2494  
   data-arc span      9297 days (25.45 yr)  
   first obs. used      1995-01-03  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39719  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:32:24  

Additional Information
 Earth MOID = 1.72309 au 
 Jupiter MOID = 1.93587 au 
 T_jup = 3.171 
[ 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 10.7   n/a MPO347528  
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. 2019-August); 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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