+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1597921213971925 2.394e-08   a 2.357917299870646 5.3334e-09 au q 1.981140692445176 5.6103e-08 au i .2648162531925143 2.7238e-06 deg node 267.686053761757 0.00075888 deg peri 166.8182460977521 0.00075896 deg M 117.8588417232945 1.177e-05 deg tp 2458567.536836596145 (2019-Mar-25.03683660) 4.277e-05 TDB period 1322.486599616574 3.62 4.487e-06 1.228e-08 d yr n .272214478471369 9.2358e-10 deg/d Q 2.734693907296116 6.1856e-09 au   Orbit Determination Parameters    # obs. used (total)      3071      data-arc span      24324 days (66.60 yr)      first obs. used      1953-11-11      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43897      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:25:11   Additional Information  Earth MOID = .996156 au   Jupiter MOID = 2.51644 au   T_jup = 3.536  [ 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 13.0   n/a MPO421637   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. 2019-August); 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 ] 2020-Oct-20 03:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin