+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   986 Amelia (A922 UA) Classification: Main-belt Asteroid          SPK-ID: 2000986 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2029586421480737 3.5345e-08   a 3.131746060215369 1.447e-08 au q 2.496131132281478 1.1136e-07 au i 14.81450343217623 4.0507e-06 deg node 92.60086913730589 1.5949e-05 deg peri 265.5193477490197 1.9067e-05 deg M 210.8024805655119 1.3287e-05 deg tp 2459839.452433884235 (2022-Sep-16.95243388) 7.8163e-05 TDB period 2024.315667868334 5.54 1.4029e-05 3.841e-08 d yr n .1778378766287429 1.2325e-09 deg/d Q 3.767360988149259 1.7406e-08 au   Orbit Determination Parameters    # obs. used (total)      2866      data-arc span      34437 days (94.28 yr)      first obs. used      1926-05-16      last obs. used      2020-08-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41239      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:23:40   Additional Information  Earth MOID = 1.54617 au   Jupiter MOID = 1.93332 au   T_jup = 3.130  [ 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 9.4   n/a MPO384754   diameter diameter 48.677 km 0.159 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.52 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Koff, R.A. (2001) Minor Planet Bull. 28, 77-78.] [Almeida, R.; Angeli, C.A.; Duffard, R.; Lazzaro, D. (2004) Astron. Astrophys. 415, 403-406.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.218   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   986 Amelia (A922 UA)          Discovered 1922-Oct-19 by Comas Sola, J. at Barcelona Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A922 UA = 1935 BK = 1966 VA = A915 JC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-06 02:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin