+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1479763443778227 1.1744e-08   a 2.685072981906266 7.4368e-09 au q 2.287745697656117 3.1046e-08 au i 10.77727722963622 8.5184e-07 deg node 232.5847710765557 3.4359e-06 deg peri 43.66686476819227 9.2112e-06 deg M 63.88320512836323 6.6167e-06 deg tp 2458915.321509900407 (2020-Mar-06.82150990) 2.9501e-05 TDB period 1607.061765757775 4.40 6.6766e-06 1.828e-08 d yr n .2240113029073589 9.3066e-10 deg/d Q 3.082400266156416 8.5373e-09 au   Orbit Determination Parameters    # obs. used (total)      3174      data-arc span      31393 days (85.95 yr)      first obs. used      1935-03-02      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39432      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:26:34   Additional Information  Earth MOID = 1.28337 au   Jupiter MOID = 2.03646 au   T_jup = 3.334  [ 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 11.33   n/a E2021B10   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. 2020-October); 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.] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] 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 ] 2021-Apr-16 15:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin