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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1222369695713946 1.7349e-08  
a 3.11139062939311 1.3788e-08 au
q 2.731063667703262 5.6642e-08 au
i 12.68870196650862 8.2853e-07 deg
node 347.668450630239 5.1024e-06 deg
peri 1.966284625519997 9.2881e-06 deg
M 305.4041711688393 6.6036e-06 deg
tp 2459504.509530528415
(2021-Oct-17.00953053)
3.7098e-05 TDB
period 2004.611585414092
5.49
1.3325e-05
3.648e-08
d
yr
n .1795859121135603 1.1938e-09 deg/d
Q 3.491717591082958 1.5474e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2648  
   data-arc span      9401 days (25.74 yr)  
   first obs. used      1995-01-03  
   last obs. used      2020-09-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39111  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:34:30  

Additional Information
 Earth MOID = 1.72309 au 
 Jupiter MOID = 1.93294 au 
 T_jup = 3.170 
[ 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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