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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1221670446433527 3.7665e-08  
a 3.109031226149604 1.5373e-08 au
q 2.729210069547007 1.1952e-07 au
i 12.68770662786512 4.162e-06 deg
node 347.6985843474168 1.8074e-05 deg
peri 2.292122862157017 2.4573e-05 deg
M 269.1173007634723 1.833e-05 deg
tp 2459505.992561619840
(2021-Oct-18.49256162)
0.00010351 TDB
period 2002.331837763043
5.48
1.4851e-05
4.066e-08
d
yr
n .1797903790024052 1.3335e-09 deg/d
Q 3.4888523827522 1.7251e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2616  
   data-arc span      9401 days (25.74 yr)  
   first obs. used      1995-01-03  
   last obs. used      2020-09-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39177  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:08  

Additional Information
 Earth MOID = 1.72309 au 
 Jupiter MOID = 1.93587 au 
 T_jup = 3.171 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456666.5 (2014-Jan-09.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1220627509461936 3.7673e-08  
q 2.728482976265596 1.1922e-07 au
tp 2457509.186813760546
(2016-Apr-30.68681376)
9.7954e-05 TDB
node 347.7399390578558 1.8074e-05 deg
peri 3.249185458574453 2.457e-05 deg
i 12.68889542524307 4.1624e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2616  
   data-arc span      9401 days (25.74 yr)  
   first obs. used      1995-01-03  
   last obs. used      2020-09-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39177  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:08  

Additional Information
 Jupiter MOID = 1.93587 au 
 T_jup = 3.171 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.419254895970229E-15 -4.462122138459011E-15 4.660878669124035E-13 3.104320769176907E-15 6.442505687871526E-14 -5.999158882886471E-16
q -4.462122138459011E-15 1.421382199768407E-14 -1.065060671683037E-12 -1.016576443902268E-14 -1.488465293238046E-13 2.915476873251699E-15
tp 4.660878669124035E-13 -1.065060671683037E-12 9.594964644379735E-9 -2.845937299915947E-12 1.648207692045968E-9 -7.965195369011699E-13
node 3.104320769176907E-15 -1.016576443902268E-14 -2.845937299915947E-12 3.266799930949615E-10 -3.189406401833189E-10 7.427158444763228E-12
peri 6.442505687871526E-14 -1.488465293238046E-13 1.648207692045968E-9 -3.189406401833189E-10 6.036773636729062E-10 -7.414025785134207E-12
i -5.999158882886471E-16 2.915476873251699E-15 -7.965195369011699E-13 7.427158444763228E-12 -7.414025785134207E-12 1.732529969618919E-11

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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