+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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  [ 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.DB Last 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 1908-Nov-11 09:47 00:02 Jupiter 1.95566824086213 1.95566787460892 1.95566860711633 4.05701227545058 3.94881317488493 2418256.907389484 2.3183393882809 161.298666152968 13.8560514561709 -86.3510546126583 4330594.99950177 T 37 CATAB v2.0f-lin.ifort 2020-Nov-13 04:18:14 2020-Nov-13 04:18 1980-Jul-01 09:05 < 00:01 Jupiter 1.96225688224649 1.96225650667074 1.96225725782314 4.10663295853806 4.00013995353698 2444421.878800437 0.748269837565326 201.585764429817 15.5161028750228 -87.7019523888266 4288704.65207564 T 37 CATAB v2.0f-lin.ifort 2020-Nov-13 04:18:14 2020-Nov-13 04:18 2134-Jan-24 05:17 00:03 Jupiter 1.96457602018806 1.9645755845614 1.96457645581819 4.09515735718076 3.98848571457152 2500510.720415888 2.6582120451497 193.546563536153 13.344068654269 -85.0691671256165 4374402.29623191 T 37 CATAB v2.0f-lin.ifort 2020-Nov-13 04:18:14 2020-Nov-13 04:18 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 ] 2021-Mar-01 21:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin