+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   789 Lena (A914 MA) Classification: Main-belt Asteroid          SPK-ID: 2000789 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1482449470134132 3.1601e-08   a 2.686494865997381 8.4302e-09 au q 2.288235576935792 8.5355e-08 au i 10.77702235077011 3.8891e-06 deg node 232.6067823187227 2.0116e-05 deg peri 43.80773276618842 2.45e-05 deg M 18.94404704053783 1.3617e-05 deg tp 2458915.865445601651 (2020-Mar-07.36544560) 6.0832e-05 TDB period 1608.338467393329 4.40 7.5705e-06 2.073e-08 d yr n .2238334823785322 1.0536e-09 deg/d Q 3.084754155058969 9.68e-09 au   Orbit Determination Parameters    # obs. used (total)      2643      data-arc span      31199 days (85.42 yr)      first obs. used      1935-03-02      last obs. used      2020-08-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41858      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:22:04   Additional Information  Earth MOID = 1.28569 au   Jupiter MOID = 2.03595 au   T_jup = 3.333  [ 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 11.3   n/a MPO473772   diameter diameter 22.483 km 0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.848 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Shipley, H.; Dillard, A.; Kendall, J.; Reichert, M.; et al. (2008) Minor Planet Bull. 35, 99-101.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2018) Icarus 309, 297-337.] geometric albedo albedo 0.153   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 789 Lena (A914 MA)          Discovered 1914-Jun-24 by Neujmin, G. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A914 MA = 1970 CE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-25 21:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin