+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2180 Marjaleena (1940 RJ) Classification: Main-belt Asteroid          SPK-ID: 2002180 [ 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 .0792956137543666 3.601e-08   a 3.013107216664161 1.6124e-08 au q 2.774181030611066 1.0831e-07 au i 9.249906293993853 4.1361e-06 deg node 233.2824972028864 2.4924e-05 deg peri 88.51538912642731 3.6474e-05 deg M 116.99954369299 2.7016e-05 deg tp 2458379.628145843114 (2018-Sep-18.12814584) 0.00014338 TDB period 1910.382386473111 5.23 1.5335e-05 4.198e-08 d yr n .188443948472861 1.5127e-09 deg/d Q 3.252033402717257 1.7403e-08 au   Orbit Determination Parameters    # obs. used (total)      2542      data-arc span      24902 days (68.18 yr)      first obs. used      1951-12-01      last obs. used      2020-02-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41753      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:14:34   Additional Information  Earth MOID = 1.78194 au   Jupiter MOID = 1.99365 au   T_jup = 3.224  [ 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 11.0   n/a MPO337265   diameter diameter 21.357 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.396 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.154   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2180 Marjaleena (1940 RJ)          Discovered 1940-Sep-08 by Alikoski, H. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1940 RJ = 1950 NQ1 = 1970 JL = 1970 JR = 1971 OL1 = 1976 NM = 1977 TT3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-30 22:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin