+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1033 Simona (A924 RH) Classification: Main-belt Asteroid          SPK-ID: 2001033 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1180885440941483 3.2282e-08   a 3.00131779378713 1.2295e-08 au q 2.646896545154947 9.4964e-08 au i 10.66374001072733 3.8393e-06 deg node 188.9367721957728 1.8418e-05 deg peri 217.636352621478 2.4836e-05 deg M 97.96451562368367 1.609e-05 deg tp 2458483.687872642183 (2018-Dec-31.18787264) 8.5035e-05 TDB period 1899.181194990103 5.20 1.167e-05 3.195e-08 d yr n .1895553730995509 1.1648e-09 deg/d Q 3.355739042419314 1.3747e-08 au   Orbit Determination Parameters    # obs. used (total)      2871      data-arc span      30890 days (84.57 yr)      first obs. used      1935-11-19      last obs. used      2020-06-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40655      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:23:12   Additional Information  Earth MOID = 1.66411 au   Jupiter MOID = 2.09915 au   T_jup = 3.216  [ 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 11.1   n/a MPO267710   diameter diameter 19.195 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 10.07 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Shipley, H.; Dillard, A.; Kendall, J.; Reichert, M.; et al. (2008) Minor Planet Bull. 35, 99-101.] geometric albedo albedo 0.196   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1033 Simona (A924 RH)          Discovered 1924-Sep-04 by Van Biesbroeck, G. at Williams Bay Independent discovery Sept. 5 by S. Belyavskij, Simeis, was announced first. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A924 RH = 1937 CG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Nov-27 12:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin