+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1949 Messina (1936 NE) Classification: Main-belt Asteroid          SPK-ID: 2001949 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2295201533385855 3.5519e-08   a 2.382995597292457 7.79e-09 au q 1.836050082396718 8.5442e-08 au i 4.654281386453254 3.3454e-06 deg node 264.9911049921611 5.1304e-05 deg peri 66.49043274152706 5.2192e-05 deg M 252.4206311466031 1.392e-05 deg tp 2459402.022399553482 (2021-Jul-06.52239955) 5.321e-05 TDB period 1343.641121712059 3.68 6.5886e-06 1.804e-08 d yr n .2679286858542185 1.3138e-09 deg/d Q 2.929941112188196 9.578e-09 au   Orbit Determination Parameters    # obs. used (total)      2217      data-arc span      30722 days (84.11 yr)      first obs. used      1936-07-08      last obs. used      2020-08-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47044      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:13:58   Additional Information  Earth MOID = .831374 au   Jupiter MOID = 2.45314 au   T_jup = 3.497  [ 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 13.42   n/a E2021B10   diameter diameter 3.560 km 0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.6491 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bianchi, E.; Padova, E. (1921) Mem. Soc. Astron. Ital. 2, 45-54.] [Pravec, P.; Wolf, M.; Sarounova, L. (2014) http://www.asu.cas.cz/~ppravec/neo.htm] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.608   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1949 Messina           Discovered 1936 July 8 by C. Jackson at Johannesburg. Named for a copper-mining town on the border between South Africa and Zimbabwe-Rhodesia. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5183 Last Updated: 2006-03-21 [ show close-approach data ] Alternate Designations  1936 NE = 1940 RK = 1951 SP = 1951 TN  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-26 09:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin