+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15739 Matsukuma (1991 ER) Classification: Main-belt Asteroid          SPK-ID: 2015739 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08084057251966205 3.1057e-08   a 2.516076881509839 9.2922e-09 au q 2.312675785905097 7.7542e-08 au i 8.043260489235651 3.834e-06 deg node 165.1044540367974 2.2084e-05 deg peri 331.0066584810118 3.316e-05 deg M 149.5771133999074 2.5475e-05 deg tp 2458394.814837493015 (2018-Oct-03.31483749) 0.00010197 TDB period 1457.754154671698 3.99 8.0755e-06 2.211e-08 d yr n .246955221390589 1.3681e-09 deg/d Q 2.71947797711458 1.0043e-08 au   Orbit Determination Parameters    # obs. used (total)      1976      data-arc span      10743 days (29.41 yr)      first obs. used      1991-03-09      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5311      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 01:01:54   Additional Information  Earth MOID = 1.32904 au   Jupiter MOID = 2.29168 au   T_jup = 3.441  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.2   n/a MPO337392   diameter diameter 5.058 km 0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.154   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15739 Matsukuma           Discovered 1991 Mar. 9 by T. Seki at Geisei. Astronomer Takehiko Matsukuma (1890-1950), specialized in celestial mechanics, particularly the three-body problem, and held a professorship of Tohoku University. He wrote Tenmongaku Shinwa (New Astronomy) for students in 1942, which was the first astronomy book that the discoverer of this minor planet encountered. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20111012/MPCPages.arc Last Updated: 2011-10-13 Alternate Designations  1991 ER = 1999 FU9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-28 12:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin