+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1045 Michela (A924 WN) Classification: Main-belt Asteroid          SPK-ID: 2001045 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .159268601628436 8.6538e-09   a 2.358928567454741 4.9047e-09 au q 1.983225313174855 1.9434e-08 au i .2644494493225545 3.8378e-07 deg node 267.6763597283453 0.00015106 deg peri 166.7336716380719 0.00015025 deg M 225.7518496424771 5.5617e-06 deg tp 2459889.987801361879 (2022-Nov-06.48780136) 2.1129e-05 TDB period 1323.337476286661 3.62 4.1272e-06 1.13e-08 d yr n .2720394505943977 8.4843e-10 deg/d Q 2.734631821734627 5.6858e-09 au   Orbit Determination Parameters    # obs. used (total)      3313      data-arc span      24701 days (67.63 yr)      first obs. used      1953-11-11      last obs. used      2021-06-28      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42939      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 11:53:27   Additional Information  Earth MOID = .998048 au   Jupiter MOID = 2.51728 au   T_jup = 3.535  [ 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 13.09   n/a E2021B10   diameter diameter 6.104 km 0.265 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 2.7010 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Benishek, V. (2019) Minor Planet Bull. 46, 208-210.] geometric albedo albedo 0.328   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B S   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) 1045 Michela (A924 WN)          Discovered 1924-Nov-19 by Van Biesbroeck, G. at Williams Bay Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A924 WN = 1953 VB2 = 1964 XJ = 1976 AL  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-28 05:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin