+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08147024474799122 3.1052e-08   a 2.514747693462927 9.2964e-09 au q 2.309870583397056 7.7496e-08 au i 8.050208659936166 3.7694e-06 deg node 165.0681084968963 2.1427e-05 deg peri 331.333746161119 3.1938e-05 deg M 198.6396157127309 2.4646e-05 deg tp 2459853.381666391940 (2022-Sep-30.88166639) 0.00010118 TDB period 1456.599158084938 3.99 8.077e-06 2.211e-08 d yr n .2471510422080084 1.3705e-09 deg/d Q 2.719624803528798 1.0054e-08 au   Orbit Determination Parameters    # obs. used (total)      2080      data-arc span      10837 days (29.67 yr)      first obs. used      1991-03-09      last obs. used      2020-11-08      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5236      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:07:40   Additional Information  Earth MOID = 1.32601 au   Jupiter MOID = 2.29034 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 14.29   n/a E2021B10   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 ] 2021-Apr-16 09:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin