+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1214 Richilde (1932 AA) Classification: Main-belt Asteroid          SPK-ID: 2001214 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1172958753016023 4.0991e-08   a 2.710410458747674 9.2897e-09 au q 2.392490491562248 1.1059e-07 au i 9.841812945835755 4.1659e-06 deg node 285.84217296977 2.2502e-05 deg peri 32.46421759699763 2.7387e-05 deg M 68.06415148648418 1.5103e-05 deg tp 2458692.346604424710 (2019-Jul-27.84660442) 6.8222e-05 TDB period 1629.862710168851 4.46 8.3794e-06 2.294e-08 d yr n .2208774995304387 1.1356e-09 deg/d Q 3.0283304259331 1.0379e-08 au   Orbit Determination Parameters    # obs. used (total)      2755      data-arc span      32635 days (89.35 yr)      first obs. used      1930-09-20      last obs. used      2020-01-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41621      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 15:48:31   Additional Information  Earth MOID = 1.38484 au   Jupiter MOID = 2.23678 au   T_jup = 3.332  [ 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 11.2   n/a MPO502164   diameter diameter 36.668 km 0.575 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.860 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Barucci, M.A.; Di Martino, M.; Dotto, E.; Fulchignoni, M.; et al. (1994) Icarus 109, 267-273.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.] geometric albedo albedo 0.048   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B Xk   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) 1214 Richilde (1932 AA)          Discovered 1932-Jan-01 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1932 AA = 1930 QD = 1961 PC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-08 18:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin